80_FR_51614 80 FR 51450 - Airworthiness Directives; The Boeing Company Airplanes

80 FR 51450 - Airworthiness Directives; The Boeing Company Airplanes

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration

Federal Register Volume 80, Issue 164 (August 25, 2015)

Page Range51450-51454
FR Document2015-20372

We are superseding Airworthiness Directive (AD) 2011-08-51 for certain The Boeing Company Model 737-300, -400, and -500 series airplanes. AD 2011-08-51 required repetitive inspections of the lap joint at certain stringers along the entire length from certain body stations. This new AD expands the inspection area, requires additional inspections for cracks and open pockets, requires corrective actions if necessary, and revises the compliance times. This AD was prompted by an evaluation by the design approval holder (DAH) that has determined that the lower fastener holes in the lower skin of the fuselage lap splice are subject to widespread fatigue damage (WFD). We are issuing this AD to detect and correct fatigue cracking of the lower fastener holes in the lower skin of the fuselage lap splice, which could result in reduced structural integrity of the airplane.

Federal Register, Volume 80 Issue 164 (Tuesday, August 25, 2015)
[Federal Register Volume 80, Number 164 (Tuesday, August 25, 2015)]
[Rules and Regulations]
[Pages 51450-51454]
From the Federal Register Online  [www.thefederalregister.org]
[FR Doc No: 2015-20372]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2014-0772; Directorate Identifier 2014-NM-090-AD; 
Amendment 39-18233; AD 2015-16-08]
RIN 2120-AA64


Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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SUMMARY: We are superseding Airworthiness Directive (AD) 2011-08-51 for 
certain The Boeing Company Model 737-300, -400, and -500 series 
airplanes. AD 2011-08-51 required repetitive inspections of the lap 
joint at certain stringers along the entire length from certain body 
stations. This new AD expands the inspection area, requires additional 
inspections for cracks and open pockets, requires corrective actions if 
necessary, and revises the compliance times. This AD was prompted by an 
evaluation by the design approval holder (DAH) that has determined that 
the lower fastener holes in the lower skin of the fuselage lap splice 
are subject to widespread fatigue damage (WFD). We are issuing this AD 
to detect and correct fatigue cracking of the lower fastener holes in 
the lower skin of the fuselage lap splice, which could result in 
reduced structural integrity of the airplane.

DATES: This AD is effective September 29, 2015.
    The Director of the Federal Register approved the incorporation by 
reference of a certain publication listed in this AD as of September 
29, 2015.

ADDRESSES: For service information identified in this AD, contact 
Boeing Commercial Airplanes, Attention: Data & Services Management, 
P.O. Box 3707, MC 2H-65, Seattle, WA 98124-2207; telephone 206-544-
5000, extension 1; fax 206-766-5680; Internet https://www.myboeingfleet.com. You may view this referenced service information 
at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., 
Renton, WA. For information on the availability of this material at the 
FAA, call 425-227-1221. It is also available on the Internet at http://www.regulations.gov by searching for and locating Docket No. FAA 2014-
0772.

Examining the AD Docket

    You may examine the AD docket on the Internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2014-
0772; or in person at the Docket Management Facility between 9 a.m. and 
5 p.m., Monday through Friday, except Federal holidays. The AD docket 
contains this AD, the regulatory evaluation, any comments received, and 
other information. The address for the Docket Office (phone: 800-647-
5527) is Docket Management Facility, U.S. Department of Transportation, 
Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 
New Jersey Avenue SE., Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Jennifer Tsakoumakis, Aerospace 
Engineer, Airframe Branch, ANM-120L, FAA, Los Angeles Aircraft 
Certification Office (ACO), 3960 Paramount Boulevard, Lakewood, CA 
90712-4137; phone: 562-627-5264; fax: 562-627-5210; email: 
[email protected].

SUPPLEMENTARY INFORMATION:

Discussion

    We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR 
part 39 to supersede AD 2011-08-51, Amendment 39-16701 (76 FR 28632, 
May 18, 2011). AD 2011-08-51 applied to certain The Boeing Company 
Model 737-300, -400, and -500 series airplanes. The NPRM published in 
the Federal Register on November 17, 2014 (79 FR 68381). The NPRM was 
prompted by an evaluation by the DAH that has determined that the lower 
fastener holes in the lower skin of the fuselage lap splice are subject 
to WFD. The NPRM proposed to continue to require repetitive inspections 
of the lap joint at certain stringers along the entire length from 
certain body stations. The NPRM also proposed to expand the inspection 
area, require additional inspections for cracks and open pockets, 
require corrective actions if necessary, and revise the compliance 
times. We are issuing this AD to detect and correct fatigue cracking of 
the lower fastener holes in the lower skin of the fuselage lap splice, 
which could result in reduced structural integrity of the airplane.

Comments

    We gave the public the opportunity to participate in developing 
this AD. The following presents the comments received on the NPRM (79 
FR 68381, November 17, 2014) and the FAA's response to each comment.

Request To Revise Wording

    Boeing requested that we revise the last sentence in paragraph (k) 
of the proposed AD (79 FR 68381, November 17, 2014) to clarify that the 
on-condition actions may be ``inspection or repair'' rather than 
``inspection and repair.'' Boeing stated that condition 10 in table 6 
of Boeing Alert Service Bulletin 737-53A1319, Revision 2, dated April 
4, 2014, describes obtaining inspection or repair instructions. Boeing 
explained that, depending on the configuration details identified, 
repetitive inspections alone may be an appropriate action, or a repair 
may be the appropriate action.
    We agree with the commenter's request. Varying detail 
configurations and the total flight cycles at the time of the finding 
are used to determine if an inspection program is adequate to address 
the unsafe condition or if installation of a repair is required. We 
have revised the wording in paragraph (k) of this AD to require 
inspection or repair.

Request To Clarify Paragraph Heading

    Southwest Airlines (SWA) stated that the heading ``Repetitive 
Inspections for Crack Indications at Stringers S-4R and S-4L, Body 
Station (BS) 360 to BS 908,'' of paragraph (g) of the proposed AD (79 
FR 68381, November 17, 2014) is misleading. SWA explained that the 
heading is confusing since the paragraph contains both an initial 
inspection and repetitive inspections.
    We agree to clarify the terminology used in the heading. When the 
term ``repetitive'' is used, it does not necessarily exclude the 
initial action. Many existing ADs use the term ``repetitive'' in the 
headers for paragraphs that contain both the initial action and 
repetitive actions. We find that no change to this AD is necessary 
regarding this issue.

[[Page 51451]]

Request To Add Clarifying Note

    SWA requested that we add a note in paragraph (g) and paragraph (h) 
of the proposed AD (79 FR 68381, November 17, 2014) specifying that 
Group 3 airplanes do not require inspection between BS 540 and BS 727E. 
SWA stated that Boeing Alert Service Bulletin 737-53A1319, Revision 2, 
dated April 4, 2014, specifies no inspections to be accomplished from 
BS 540 to BS 727E on Group 3 airplanes. SWA stated that, since 
paragraphs (g) and (h) of the proposed AD and tables 1, 2, and 3 of 
Boeing Alert Service Bulletin 737-53A1319, Revision 2, dated April 4, 
2014, define the inspection area as stringers 4L and 4R from BS 360 to 
BS 908 for all airplanes, it could be interpreted that the proposed AD 
would require an increased inspection area for Group 3 airplanes.
    We partially agree with the commenter's request. We disagree to add 
a note in paragraph (g) and paragraph (h) of this AD. The 
Accomplishment Instructions of Boeing Alert Service Bulletin 737-
53A1319, Revision 2, dated April 4, 2014, are clear regarding which 
areas must be inspected. The SUMMARY section of this final rule does 
specify that the inspection area is increased. However, we have added 
``as applicable'' to paragraphs (g) and paragraph (h) of this AD to 
provide clarification regarding the inspection area.

Request To Clarify Compliance Times

    SWA requested that we revise paragraph (g) of the proposed AD (79 
FR 68381, November 17, 2014) to clarify the compliance times. SWA 
recommended splitting the paragraph requirements into three separate 
paragraphs to address three different airplane groups. SWA stated that 
table 1 of paragraph 1.E., ``Compliance,'' of Boeing Alert Service 
Bulletin 737-53A1319, Revision 2, dated April 4, 2014, does not account 
for airplanes that were inspected previously using either Boeing Alert 
Service Bulletin 737-53A1319, dated April 4, 2011, or Boeing Alert 
Service Bulletin 737-53A1319, Revision 1, dated April 8, 2011. SWA 
stated that it is unclear how to apply the compliance times in table 1 
for these airplanes, and as a result, airplanes with more than 30,000 
total flight cycles that were not inspected previously using Boeing 
Alert Service Bulletin 737-53A1319, Revision 2, dated April 4, 2014, 
will have exceeded the compliance times in table 1 upon the effective 
date of the AD.
    SWA stated that since paragraph (n) of the proposed AD (79 FR 
68381, November 17, 2014) provides credit for actions required by 
paragraph (g) of the proposed AD that were performed prior to the 
effective date of the AD using either Boeing Alert Service Bulletin 
737-53A1319, dated April 4, 2011, or Boeing Alert Service Bulletin 737-
53A1319, Revision 1, dated April 8, 2011, SWA assumes that the intent 
of paragraph (g) of the proposed AD is for the operator to accomplish 
the first inspection in accordance with Boeing Alert Service Bulletin 
737-53A1319, Revision 2, dated April 4, 2014, within 500 cycles from 
the last inspection accomplished previously in accordance with either 
the Boeing Alert Service Bulletin, dated April 4, 2011, or Revision 1, 
dated April 8, 2011.
    We do not agree with the commenter's request to revise paragraph 
(g) of this AD. However, we do agree to clarify the compliance times. 
For airplanes that were inspected previously using either Boeing Alert 
Service Bulletin 737-53A1319, dated April 4, 2011, or Boeing Alert 
Service Bulletin 737-53A1319, Revision 1, dated April 8, 2011, the next 
inspection must be done within 500 cycles from the last inspection 
accomplished previously in accordance with either the Boeing Alert 
Service Bulletin, dated April 4, 2011, or Revision 1, dated April 8, 
2011, except as provided by table 2 of paragraph 1.E., ``Compliance,'' 
of Boeing Alert Service Bulletin 737-53A1319, Revision 2, dated April 
4, 2014. Table 2 of paragraph 1.E., ``Compliance,'' of Boeing Alert 
Service Bulletin 737-53A1319, Revision 2, dated April 4, 2014, provides 
optional inspections that may be used after inspections in table 1 of 
paragraph 1.E., ``Compliance,'' of Boeing Alert Service Bulletin 737-
53A1319, Revision 2, dated April 4, 2014, have been accomplished.
    For airplanes that were not inspected previously using either 
Boeing Alert Service Bulletin 737-53A1319, dated April 4, 2011, or 
Boeing Alert Service Bulletin 737-53A1319, Revision 1, dated April 8, 
2011, the initial inspection must be done within the applicable 
compliance times specified in table 1 of paragraph 1.E., 
``Compliance,'' of Boeing Alert Service Bulletin 737-53A1319, Revision 
2, dated April 4, 2014. We have not changed this AD in this regard.

Request To Clarify Inspection Requirements

    SWA requested that we provide clarification regarding the 
applicability of table 2 of paragraph 1.E., ``Compliance,'' of Boeing 
Alert Service Bulletin 737-53A1319, Revision 2, dated April 4, 2014, 
for accomplishing the repetitive inspections required by paragraph (g) 
of the proposed AD (79 FR 68381, November 17, 2014). SWA stated that 
the inspection intervals defined in table 2 are dependent on the total 
flight cycles of airplanes that meet condition 1 (no crack found), and 
that operators of airplanes that meet condition 2 (any crack found) 
should contact Boeing for repair instructions prior to further flight.
    SWA stated that the alternative repetitive inspection intervals 
apply only to aircraft that meet condition 1 each time the aircraft is 
inspected. SWA explained that it is unclear whether or not the operator 
is able to continue utilizing the table 2 inspection intervals if 
condition 2 is found during any repetitive inspection on an airplane, 
or if the operator must revert back to the table 1 repetitive 
inspection interval from that point forward for that airplane.
    We agree that clarification is necessary. Paragraph (l) of this AD 
requires a repair if any crack is found. Accomplishment of the repair 
terminates the repetitive inspections required by paragraphs (g) and 
(j) of this AD in the repaired area only. Repetitive inspections must 
be done on all unrepaired areas at the times specified in table 1 or 
table 2, as applicable. We find that no change to this AD is necessary 
regarding this issue.

Requests for Credit and Exception to Inspection Requirements

    SWA requested that we include a provision in paragraph (n) of the 
proposed AD (79 FR 68381, November 17, 2014) to provide credit for the 
general visual inspection required by paragraph (k) of the proposed AD 
for skin panels that were replaced using the procedures specified in 
Figure 35 of Boeing Service Bulletin 737-53-1306, provided that the 
corrective action for Condition 9 is followed.
    SWA also requested that we add an exception in paragraph (m) of the 
proposed AD (79 FR 68381, November 17, 2014) that allows the operator 
to omit the inspection required by paragraph (k) of the proposed AD if 
the corrective action for Condition 9 is followed and the operator's 
records show the part number of the skin assembly installed on the 
airplane.
    To justify its requests, SWA stated that its airplanes, defined as 
Group 1 in Boeing Alert Service Bulletin 737-53A1319, Revision 2, dated 
April 4, 2014, on which the crown skin panel replacement was 
accomplished as described previously in Figure 35 of Boeing Service 
Bulletin 737-53-1306, were inspected previously to determine if the 
existing skin assembly was an ``MPN 65C35798-1 (open pockets

[[Page 51452]]

adjacent to the STR 4R lap joint)'' or an ``MPN 65C35798-8 (closed 
pockets adjacent to the STR 4R lap joint).'' SWA stated that the 
existing skin panel was then replaced with a new skin panel of the same 
configuration as the removed production panel. SWA explained that if an 
operator's records show the part number of the skin panel assembly 
installed, the operator will be able to determine if the panel is 
configured with Condition 9 or Condition 10 and, therefore, SWA does 
not need to do the inspection required by paragraph (k) of the proposed 
AD.
    We disagree with the commenter's requests. The fuselage crown skin 
replacements described in Boeing Service Bulletin 737-53-1306 are a 
part of a SWA-specific modification program. We do not consider it 
appropriate to include various provisions in an AD that are applicable 
only to a single operator's unique use of an affected airplane. 
However, an operator may request approval of an alternative method of 
compliance under the provisions of paragraph (o) of this AD if 
sufficient data are submitted to substantiate that the fuselage crown 
skin replacements would provide an acceptable level of safety. We have 
not changed this AD in this regard.

Conclusion

    We reviewed the relevant data, considered the comments received, 
and determined that air safety and the public interest require adopting 
this AD with the changes described previously and minor editorial 
changes. We have determined that these minor changes:
     Are consistent with the intent that was proposed in the 
NPRM (79 FR 68381, November 17, 2014) for correcting the unsafe 
condition; and
     Do not add any additional burden upon the public than was 
already proposed in the NPRM (79 FR 68381, November 17, 2014).
    We also determined that these changes will not increase the 
economic burden on any operator or increase the scope of this AD.

Interim Action

    We consider this AD interim action. An investigation is ongoing, 
and no terminating action has been developed. Once terminating action 
is developed, approved, and available, we might consider additional 
rulemaking.

Related Service Information Under 1 CFR Part 51

    We reviewed Boeing Alert Service Bulletin 737-53A1319, Revision 2, 
dated April 4, 2014. The service information describes procedures for 
inspections for crack indications at certain stringers, an inspection 
for open pockets of the lower skin panel at stringer S-4R, and repairs. 
This service information is reasonably available because the interested 
parties have access to it through their normal course of business or by 
the means identified in the ADDRESSES section of this AD.

Costs of Compliance

    We estimate that this AD affects 130 airplanes of U.S. registry.
    We estimate the following costs to comply with this AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                                  Cost on U.S.
            Action                    Labor cost            Parts cost       Cost per product      operators
----------------------------------------------------------------------------------------------------------------
Repetitive inspections          6 or 4,270              None..............  $510 or $362,950   $66,300 or
 [actions retained from AD       work[dash]hours                             per inspection     $47,183,500 per
 2011-08-51, Amendment 39-       (depending on                               cycle.             inspection
 16701 (76 FR 28632, May 18,     inspection method) x                                           cycle.
 2011)].                         $85 per work-hour =
                                 $510 or $362,950 per
                                 inspection cycle.
Repetitive inspections [new     4 or 550                None..............  $340 or $46,750    $44,200 or
 action].                        work[dash]hours                             per inspection     $6,077,500 per
                                 (depending on                               cycle.             inspection
                                 inspection method) x                                           cycle.
                                 $85 per hour = $340
                                 or $46,750 per
                                 inspection cycle.
One-time inspections [new       5,370 work[dash]hours   None..............  $456,450.........  $59,338,500.
 action].                        x $85 per hour =
                                 $456,450.
----------------------------------------------------------------------------------------------------------------

    We have received no definitive data that would enable us to provide 
a cost estimate for the on-condition actions specified in this AD.

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, Section 106, describes the 
authority of the FAA Administrator. Subtitle VII, Aviation Programs, 
describes in more detail the scope of the Agency's authority.
    We are issuing this rulemaking under the authority described in 
Subtitle VII, Part A, Subpart III, Section 44701, ``General 
requirements.'' Under that section, Congress charges the FAA with 
promoting safe flight of civil aircraft in air commerce by prescribing 
regulations for practices, methods, and procedures the Administrator 
finds necessary for safety in air commerce. This regulation is within 
the scope of that authority because it addresses an unsafe condition 
that is likely to exist or develop on products identified in this 
rulemaking action.

Regulatory Findings

    We have determined that this AD will not have federalism 
implications under Executive Order 13132. This AD will not have a 
substantial direct effect on the States, on the relationship between 
the national government and the States, or on the distribution of power 
and responsibilities among the various levels of government.
    For the reasons discussed above, I certify that this AD:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866,
    (2) Is not a ``significant rule'' under DOT Regulatory Policies and 
Procedures (44 FR 11034, February 26, 1979),
    (3) Will not affect intrastate aviation in Alaska, and
    (4) Will not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

Adoption of the Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
1. The authority citation for part 39 continues to read as follows:


[[Page 51453]]


    Authority:  49 U.S.C. 106(g), 40113, 44701.


Sec.  39.13  [Amended]

0
2. The FAA amends Sec.  39.13 by removing Airworthiness Directive (AD) 
2011-08-51, Amendment 39-16701 (76 FR 28632, May 18, 2011), and adding 
the following new AD:

2015-16-08 The Boeing Company: Amendment 39-18233; Docket No. FAA-
2014-0772; Directorate Identifier 2014-NM-090-AD.

(a) Effective Date

    This AD is effective September 29, 2015.

(b) Affected ADs

    This AD replaces AD 2011-08-51, Amendment 39-16701 (76 FR 28632, 
May 18, 2011).

(c) Applicability

    This AD applies to The Boeing Company Model 737-300, -400, and -
500 series airplanes, certificated in any category, as identified in 
Boeing Alert Service Bulletin 737-53A1319, Revision 2, dated April 
4, 2014.

(d) Subject

    Air Transport Association (ATA) of America Code 53: Fuselage.

(e) Unsafe Condition

    This AD was prompted by an evaluation by the design approval 
holder (DAH) that has determined that the lower fastener holes in 
the lower skin of the fuselage lap splice are subject to widespread 
fatigue damage (WFD). We are issuing this AD to detect and correct 
fatigue cracking of the lower fastener holes in the lower skin of 
the fuselage lap splice, which could result in reduced structural 
integrity of the airplane.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Repetitive Inspections for Crack Indications at Stringers S-4R and 
S-4L, Body Station (BS) 360 to BS 908

    At the applicable time specified in table 1 of paragraph 1.E., 
``Compliance,'' of Boeing Alert Service Bulletin 737-53A1319, 
Revision 2, dated April 4, 2014: Do an external eddy current 
inspection, or internal eddy current and detailed inspections, for 
crack indications at stringers S-4R and S-4L, from BS 360 to BS 908, 
as applicable, except as provided by paragraph (h) of this AD, in 
accordance with Part 1 of the Accomplishment Instructions of Boeing 
Alert Service Bulletin 737-53A1319, Revision 2, dated April 4, 2014. 
Repeat the inspection(s) thereafter at the applicable intervals 
specified in table 1 or table 2, as applicable, of paragraph 1.E., 
``Compliance,'' of Boeing Alert Service Bulletin 737-53A1319, 
Revision 2, dated April 4, 2014. Either inspection option may be 
used at any repetitive inspection cycle.

(h) One-Time Inspections for Cracks at Stringers S-4L and S-4R, BS 360 
to BS 908

    At the applicable time specified in table 3 of paragraph 1.E., 
``Compliance,'' of Boeing Alert Service Bulletin 737-53A1319, 
Revision 2, dated April 4, 2014, except as required by paragraph (m) 
of this AD: Do one-time internal detailed and eddy current 
inspections for cracks at stringers S-4R and S-4L, from BS 360 to BS 
908, as applicable, in accordance with Part 2 of the Accomplishment 
Instructions of Boeing Alert Service Bulletin 737-53A1319, Revision 
2, dated April 4, 2014. Accomplishment of the inspections required 
by this paragraph does not terminate the repetitive inspections 
required by paragraph (g) of this AD.

(i) One-Time Inspections for Cracks at Stringer S-4R, BS 908 to BS 1016

    For airplanes identified as Group 2, 3, 5, and 7 in Boeing Alert 
Service Bulletin 737-53A1319, Revision 2, dated April 4, 2014: At 
the applicable time specified in table 4 of paragraph 1.E., 
``Compliance,'' of Boeing Alert Service Bulletin 737-53A1319, 
Revision 2, dated April 4, 2014, except as required by paragraph (m) 
of this AD, do one-time internal detailed and eddy current 
inspections for cracks at stringer S-4R, from BS 908 to BS 1016, in 
accordance with Part 3 of the Accomplishment Instructions of Boeing 
Alert Service Bulletin 737-53A1319, Revision 2, dated April 4, 2014.

(j) Repetitive Inspections for Cracks at Stringer S-4R, BS 908 to BS 
1016

    For airplanes identified as Group 2, 3, 5, and 7 in Boeing Alert 
Service Bulletin 737-53A1319, Revision 2, dated April 4, 2014: At 
the applicable time specified in table 5 of paragraph 1.E., 
``Compliance,'' of Boeing Alert Service Bulletin 737-53A1319, 
Revision 2, dated April 4, 2014, except as required by paragraph (m) 
of this AD, do external eddy current inspections, or internal eddy 
current and detailed inspections, for cracks at stringer S-4R, from 
BS 908 to BS 1016, in accordance with Part 4 of the Accomplishment 
Instructions of Boeing Alert Service Bulletin 737-53A1319, Revision 
2, dated April 4, 2014. Repeat the inspection(s) thereafter at the 
applicable intervals specified in table 5 of paragraph 1.E., 
``Compliance,'' of Boeing Alert Service Bulletin 737-53A1319, 
Revision 2, dated April 4, 2014. Either inspection option may be 
used at any repetitive inspection cycle.

(k) General Visual Inspection for Open Pockets at Stringer S-4R, BS 908 
to BS 1016

    For airplanes identified as Group 1, 4, and 6 in Boeing Alert 
Service Bulletin 737-53A1319, Revision 2, dated April 4, 2014: At 
the applicable time specified in table 6 of paragraph 1.E., 
``Compliance,'' of Boeing Alert Service Bulletin 737-53A1319, 
Revision 2, dated April 4, 2014, except as required by paragraph (m) 
of this AD, do a general visual inspection for open pockets of the 
lower skin panel at stringer S-4R, from BS 908 to BS 1016, in 
accordance with Part 5 of the Accomplishment Instructions of Boeing 
Alert Service Bulletin 737-53A1319, Revision 2, dated April 4, 2014. 
If any open pocket is found, before further flight, inspect or 
repair using a method approved in accordance with the procedures 
specified in paragraph (o) of this AD.

(l) Corrective Action

    If any crack is found during any inspection required by this AD: 
Before further flight, repair using a method approved in accordance 
with the procedures specified in paragraph (o) of this AD. 
Accomplishment of repairs approved in accordance with the procedures 
specified in paragraph (o) of this AD terminates the repetitive 
inspections specified in paragraphs (g) and (j) of this AD in the 
repaired areas only.

(m) Service Information Exception

    Where Boeing Alert Service Bulletin 737-53A1319, Revision 2, 
dated April 4, 2014, specifies a compliance time ``after the 
Revision 2 date of this service bulletin,'' this AD requires 
compliance within the specified compliance time after the effective 
date of this AD.

(n) Credit for Previous Actions

    This paragraph provides credit for actions required by paragraph 
(g) of this AD, if those actions were performed before the effective 
date of this AD using Boeing Alert Service Bulletin 737-53A1319, 
dated April 4, 2011; or Boeing Alert Service Bulletin 737-53A1319, 
Revision 1, dated April 8, 2011. Boeing Alert Service Bulletin 737-
53A1319, dated April 4, 2011, was incorporated by reference in AD 
2011-08-51, Amendment 39-16701 (76 FR 28632, May 18, 2011). Boeing 
Alert Service Bulletin 737-53A1319, Revision 1, dated April 8, is 
not incorporated by reference in this AD.

(o) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, Los Angeles Aircraft Certification Office 
(ACO), FAA, has the authority to approve AMOCs for this AD, if 
requested using the procedures found in 14 CFR 39.19. In accordance 
with 14 CFR 39.19, send your request to your principal inspector or 
local Flight Standards District Office, as appropriate. If sending 
information directly to the manager of the ACO, send it to the 
attention of the person identified in paragraph (p)(1) of this AD.
    (2) Before using any approved AMOC, notify your appropriate 
principal inspector, or lacking a principal inspector, the manager 
of the local flight standards district office/certificate holding 
district office.
    (3) An AMOC that provides an acceptable level of safety may be 
used for any repair required by this AD if it is approved by the 
Boeing Commercial Airplanes Organization Designation Authorization 
(ODA) that has been authorized by the Manager, Los Angeles ACO, to 
make those findings. For a repair method to be approved, the repair 
must meet the certification basis of the airplane, and the approval 
must specifically refer to this AD.
    (4) AMOCs approved for AD 2011-08-51, Amendment 39-16701 (76 FR 
28632, May 18, 2011), are approved as AMOCs for the corresponding 
provisions of paragraphs (g) and (l) of this AD.

[[Page 51454]]

(p) Related Information

    (1) For more information about this AD, contact Jennifer 
Tsakoumakis, Aerospace Engineer, Airframe Branch, ANM-120L, FAA, Los 
Angeles Aircraft Certification Office (ACO), 3960 Paramount 
Boulevard, Lakewood, CA 90712-4137; phone: 562-627-5264; fax: 562-
627-5210; email: [email protected].
    (2) Service information identified in this AD that is not 
incorporated by reference is available at the addresses specified in 
paragraphs (q)(4) and (q)(5) of this AD.

(q) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference (IBR) of the service information listed 
in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
    (2) You must use this service information as applicable to do 
the actions required by this AD, unless the AD specifies otherwise.
    (3) The following service information was approved for IBR on 
September 29, 2015.
    (i) Boeing Alert Service Bulletin 737-53A1319, Revision 2, dated 
April 4, 2014.
    (ii) Reserved.
    (4) For Boeing service information identified in this AD, 
contact Boeing Commercial Airplanes, Attention: Data & Services 
Management, P.O. Box 3707, MC 2H-65, Seattle, WA 98124-2207; 
telephone 206-544-5000, extension 1; fax 206-766-5680; Internet 
https://www.myboeingfleet.com.
    (5) You may view this referenced service information at the FAA, 
Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, WA. 
For information on the availability of this material at the FAA, 
call 425-227-1221.
    (6) You may view this service information that is incorporated 
by reference at the National Archives and Records Administration 
(NARA). For information on the availability of this material at 
NARA, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html.

    Issued in Renton, Washington, on August 7, 2015.
Jeffrey E. Duven,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2015-20372 Filed 8-24-15; 8:45 am]
 BILLING CODE 4910-13-P



                                           51450             Federal Register / Vol. 80, No. 164 / Tuesday, August 25, 2015 / Rules and Regulations

                                           1601 Lind Avenue SW., Renton, WA. For                   Commercial Airplanes, Attention: Data                 inspections for cracks and open pockets,
                                           information on the availability of this                 & Services Management, P.O. Box 3707,                 require corrective actions if necessary,
                                           material at the FAA, call 425–227–1221.                 MC 2H–65, Seattle, WA 98124–2207;                     and revise the compliance times. We are
                                             (5) You may view this service information             telephone 206–544–5000, extension 1;
                                           that is incorporated by reference at the
                                                                                                                                                         issuing this AD to detect and correct
                                           National Archives and Records
                                                                                                   fax 206–766–5680; Internet https://                   fatigue cracking of the lower fastener
                                           Administration (NARA). For information on               www.myboeingfleet.com. You may view                   holes in the lower skin of the fuselage
                                           the availability of this material at NARA, call         this referenced service information at                lap splice, which could result in
                                           202–741–6030, or go to: http://                         the FAA, Transport Airplane                           reduced structural integrity of the
                                           www.archives.gov/federal-register/cfr/ibr-              Directorate, 1601 Lind Avenue SW.,                    airplane.
                                           locations.html.                                         Renton, WA. For information on the
                                                                                                   availability of this material at the FAA,             Comments
                                             Issued in Renton, Washington, on August
                                           10, 2015.                                               call 425–227–1221. It is also available
                                                                                                                                                           We gave the public the opportunity to
                                           Michael Kaszycki,                                       on the Internet at http://
                                                                                                                                                         participate in developing this AD. The
                                           Acting Manager, Transport Airplane                      www.regulations.gov by searching for
                                                                                                                                                         following presents the comments
                                           Directorate, Aircraft Certification Service.            and locating Docket No. FAA 2014–
                                                                                                                                                         received on the NPRM (79 FR 68381,
                                           [FR Doc. 2015–20585 Filed 8–24–15; 8:45 am]             0772.
                                                                                                                                                         November 17, 2014) and the FAA’s
                                           BILLING CODE 4910–13–P                                  Examining the AD Docket                               response to each comment.
                                                                                                     You may examine the AD docket on                    Request To Revise Wording
                                           DEPARTMENT OF TRANSPORTATION                            the Internet at http://
                                                                                                   www.regulations.gov by searching for                     Boeing requested that we revise the
                                           Federal Aviation Administration                         and locating Docket No. FAA–2014–                     last sentence in paragraph (k) of the
                                                                                                   0772; or in person at the Docket                      proposed AD (79 FR 68381, November
                                           14 CFR Part 39                                          Management Facility between 9 a.m.                    17, 2014) to clarify that the on-condition
                                                                                                   and 5 p.m., Monday through Friday,                    actions may be ‘‘inspection or repair’’
                                           [Docket No. FAA–2014–0772; Directorate                  except Federal holidays. The AD docket                rather than ‘‘inspection and repair.’’
                                           Identifier 2014–NM–090–AD; Amendment
                                           39–18233; AD 2015–16–08]
                                                                                                   contains this AD, the regulatory                      Boeing stated that condition 10 in table
                                                                                                   evaluation, any comments received, and                6 of Boeing Alert Service Bulletin 737–
                                           RIN 2120–AA64                                           other information. The address for the                53A1319, Revision 2, dated April 4,
                                                                                                   Docket Office (phone: 800–647–5527) is                2014, describes obtaining inspection or
                                           Airworthiness Directives; The Boeing                    Docket Management Facility, U.S.                      repair instructions. Boeing explained
                                           Company Airplanes                                       Department of Transportation, Docket                  that, depending on the configuration
                                           AGENCY:  Federal Aviation                               Operations, M–30, West Building                       details identified, repetitive inspections
                                           Administration (FAA), DOT.                              Ground Floor, Room W12–140, 1200                      alone may be an appropriate action, or
                                           ACTION: Final rule.
                                                                                                   New Jersey Avenue SE., Washington,                    a repair may be the appropriate action.
                                                                                                   DC 20590.
                                                                                                                                                            We agree with the commenter’s
                                           SUMMARY:   We are superseding                           FOR FURTHER INFORMATION CONTACT:                      request. Varying detail configurations
                                           Airworthiness Directive (AD) 2011–08–                   Jennifer Tsakoumakis, Aerospace                       and the total flight cycles at the time of
                                           51 for certain The Boeing Company                       Engineer, Airframe Branch, ANM–120L,                  the finding are used to determine if an
                                           Model 737–300, –400, and –500 series                    FAA, Los Angeles Aircraft Certification               inspection program is adequate to
                                           airplanes. AD 2011–08–51 required                       Office (ACO), 3960 Paramount                          address the unsafe condition or if
                                           repetitive inspections of the lap joint at              Boulevard, Lakewood, CA 90712–4137;                   installation of a repair is required. We
                                           certain stringers along the entire length               phone: 562–627–5264; fax: 562–627–                    have revised the wording in paragraph
                                           from certain body stations. This new AD                 5210; email: jennifer.tsakoumakis@                    (k) of this AD to require inspection or
                                           expands the inspection area, requires                   faa.gov.                                              repair.
                                           additional inspections for cracks and                   SUPPLEMENTARY INFORMATION:
                                           open pockets, requires corrective                                                                             Request To Clarify Paragraph Heading
                                           actions if necessary, and revises the                   Discussion
                                           compliance times. This AD was                                                                                    Southwest Airlines (SWA) stated that
                                                                                                     We issued a notice of proposed
                                           prompted by an evaluation by the                                                                              the heading ‘‘Repetitive Inspections for
                                                                                                   rulemaking (NPRM) to amend 14 CFR
                                           design approval holder (DAH) that has                                                                         Crack Indications at Stringers S–4R and
                                                                                                   part 39 to supersede AD 2011–08–51,
                                           determined that the lower fastener holes                                                                      S–4L, Body Station (BS) 360 to BS 908,’’
                                                                                                   Amendment 39–16701 (76 FR 28632,
                                           in the lower skin of the fuselage lap                                                                         of paragraph (g) of the proposed AD (79
                                                                                                   May 18, 2011). AD 2011–08–51 applied
                                           splice are subject to widespread fatigue                                                                      FR 68381, November 17, 2014) is
                                                                                                   to certain The Boeing Company Model
                                           damage (WFD). We are issuing this AD                    737–300, –400, and –500 series                        misleading. SWA explained that the
                                           to detect and correct fatigue cracking of               airplanes. The NPRM published in the                  heading is confusing since the
                                           the lower fastener holes in the lower                   Federal Register on November 17, 2014                 paragraph contains both an initial
                                           skin of the fuselage lap splice, which                  (79 FR 68381). The NPRM was                           inspection and repetitive inspections.
                                           could result in reduced structural                      prompted by an evaluation by the DAH                     We agree to clarify the terminology
                                           integrity of the airplane.                              that has determined that the lower                    used in the heading. When the term
                                           DATES: This AD is effective September                   fastener holes in the lower skin of the               ‘‘repetitive’’ is used, it does not
                                           29, 2015.                                               fuselage lap splice are subject to WFD.               necessarily exclude the initial action.
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                                             The Director of the Federal Register                  The NPRM proposed to continue to                      Many existing ADs use the term
                                           approved the incorporation by reference                 require repetitive inspections of the lap             ‘‘repetitive’’ in the headers for
                                           of a certain publication listed in this AD              joint at certain stringers along the entire           paragraphs that contain both the initial
                                           as of September 29, 2015.                               length from certain body stations. The                action and repetitive actions. We find
                                           ADDRESSES: For service information                      NPRM also proposed to expand the                      that no change to this AD is necessary
                                           identified in this AD, contact Boeing                   inspection area, require additional                   regarding this issue.


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                                                             Federal Register / Vol. 80, No. 164 / Tuesday, August 25, 2015 / Rules and Regulations                                          51451

                                           Request To Add Clarifying Note                          actions required by paragraph (g) of the              paragraph (g) of the proposed AD (79 FR
                                              SWA requested that we add a note in                  proposed AD that were performed prior                 68381, November 17, 2014). SWA stated
                                           paragraph (g) and paragraph (h) of the                  to the effective date of the AD using                 that the inspection intervals defined in
                                           proposed AD (79 FR 68381, November                      either Boeing Alert Service Bulletin                  table 2 are dependent on the total flight
                                           17, 2014) specifying that Group 3                       737–53A1319, dated April 4, 2011, or                  cycles of airplanes that meet condition
                                           airplanes do not require inspection                     Boeing Alert Service Bulletin 737–                    1 (no crack found), and that operators of
                                           between BS 540 and BS 727E. SWA                         53A1319, Revision 1, dated April 8,                   airplanes that meet condition 2 (any
                                           stated that Boeing Alert Service Bulletin               2011, SWA assumes that the intent of                  crack found) should contact Boeing for
                                                                                                   paragraph (g) of the proposed AD is for               repair instructions prior to further flight.
                                           737–53A1319, Revision 2, dated April 4,
                                                                                                   the operator to accomplish the first                     SWA stated that the alternative
                                           2014, specifies no inspections to be
                                                                                                   inspection in accordance with Boeing                  repetitive inspection intervals apply
                                           accomplished from BS 540 to BS 727E                                                                           only to aircraft that meet condition 1
                                                                                                   Alert Service Bulletin 737–53A1319,
                                           on Group 3 airplanes. SWA stated that,                                                                        each time the aircraft is inspected. SWA
                                                                                                   Revision 2, dated April 4, 2014, within
                                           since paragraphs (g) and (h) of the                                                                           explained that it is unclear whether or
                                                                                                   500 cycles from the last inspection
                                           proposed AD and tables 1, 2, and 3 of                                                                         not the operator is able to continue
                                                                                                   accomplished previously in accordance
                                           Boeing Alert Service Bulletin 737–                                                                            utilizing the table 2 inspection intervals
                                                                                                   with either the Boeing Alert Service
                                           53A1319, Revision 2, dated April 4,                                                                           if condition 2 is found during any
                                                                                                   Bulletin, dated April 4, 2011, or
                                           2014, define the inspection area as                                                                           repetitive inspection on an airplane, or
                                                                                                   Revision 1, dated April 8, 2011.
                                           stringers 4L and 4R from BS 360 to BS                      We do not agree with the commenter’s               if the operator must revert back to the
                                           908 for all airplanes, it could be                      request to revise paragraph (g) of this               table 1 repetitive inspection interval
                                           interpreted that the proposed AD would                  AD. However, we do agree to clarify the               from that point forward for that
                                           require an increased inspection area for                compliance times. For airplanes that                  airplane.
                                           Group 3 airplanes.                                      were inspected previously using either                   We agree that clarification is
                                              We partially agree with the                          Boeing Alert Service Bulletin 737–                    necessary. Paragraph (l) of this AD
                                           commenter’s request. We disagree to                     53A1319, dated April 4, 2011, or Boeing               requires a repair if any crack is found.
                                           add a note in paragraph (g) and                         Alert Service Bulletin 737–53A1319,                   Accomplishment of the repair
                                           paragraph (h) of this AD. The                           Revision 1, dated April 8, 2011, the next             terminates the repetitive inspections
                                           Accomplishment Instructions of Boeing                   inspection must be done within 500                    required by paragraphs (g) and (j) of this
                                           Alert Service Bulletin 737–53A1319,                     cycles from the last inspection                       AD in the repaired area only. Repetitive
                                           Revision 2, dated April 4, 2014, are                    accomplished previously in accordance                 inspections must be done on all
                                           clear regarding which areas must be                     with either the Boeing Alert Service                  unrepaired areas at the times specified
                                           inspected. The SUMMARY section of this                  Bulletin, dated April 4, 2011, or                     in table 1 or table 2, as applicable. We
                                           final rule does specify that the                        Revision 1, dated April 8, 2011, except               find that no change to this AD is
                                           inspection area is increased. However,                  as provided by table 2 of paragraph 1.E.,             necessary regarding this issue.
                                           we have added ‘‘as applicable’’ to                      ‘‘Compliance,’’ of Boeing Alert Service
                                           paragraphs (g) and paragraph (h) of this                                                                      Requests for Credit and Exception to
                                                                                                   Bulletin 737–53A1319, Revision 2,
                                           AD to provide clarification regarding the                                                                     Inspection Requirements
                                                                                                   dated April 4, 2014. Table 2 of
                                           inspection area.                                        paragraph 1.E., ‘‘Compliance,’’ of Boeing                SWA requested that we include a
                                                                                                   Alert Service Bulletin 737–53A1319,                   provision in paragraph (n) of the
                                           Request To Clarify Compliance Times
                                                                                                   Revision 2, dated April 4, 2014,                      proposed AD (79 FR 68381, November
                                              SWA requested that we revise                         provides optional inspections that may                17, 2014) to provide credit for the
                                           paragraph (g) of the proposed AD (79 FR                 be used after inspections in table 1 of               general visual inspection required by
                                           68381, November 17, 2014) to clarify the                paragraph 1.E., ‘‘Compliance,’’ of Boeing             paragraph (k) of the proposed AD for
                                           compliance times. SWA recommended                       Alert Service Bulletin 737–53A1319,                   skin panels that were replaced using the
                                           splitting the paragraph requirements                    Revision 2, dated April 4, 2014, have                 procedures specified in Figure 35 of
                                           into three separate paragraphs to                       been accomplished.                                    Boeing Service Bulletin 737–53–1306,
                                           address three different airplane groups.                   For airplanes that were not inspected              provided that the corrective action for
                                           SWA stated that table 1 of paragraph                    previously using either Boeing Alert                  Condition 9 is followed.
                                           1.E., ‘‘Compliance,’’ of Boeing Alert                   Service Bulletin 737–53A1319, dated                      SWA also requested that we add an
                                           Service Bulletin 737–53A1319, Revision                  April 4, 2011, or Boeing Alert Service                exception in paragraph (m) of the
                                           2, dated April 4, 2014, does not account                Bulletin 737–53A1319, Revision 1,                     proposed AD (79 FR 68381, November
                                           for airplanes that were inspected                       dated April 8, 2011, the initial                      17, 2014) that allows the operator to
                                           previously using either Boeing Alert                    inspection must be done within the                    omit the inspection required by
                                           Service Bulletin 737–53A1319, dated                     applicable compliance times specified                 paragraph (k) of the proposed AD if the
                                           April 4, 2011, or Boeing Alert Service                  in table 1 of paragraph 1.E.,                         corrective action for Condition 9 is
                                           Bulletin 737–53A1319, Revision 1,                       ‘‘Compliance,’’ of Boeing Alert Service               followed and the operator’s records
                                           dated April 8, 2011. SWA stated that it                 Bulletin 737–53A1319, Revision 2,                     show the part number of the skin
                                           is unclear how to apply the compliance                  dated April 4, 2014. We have not                      assembly installed on the airplane.
                                           times in table 1 for these airplanes, and               changed this AD in this regard.                          To justify its requests, SWA stated
                                           as a result, airplanes with more than                                                                         that its airplanes, defined as Group 1 in
                                           30,000 total flight cycles that were not                Request To Clarify Inspection                         Boeing Alert Service Bulletin 737–
                                           inspected previously using Boeing Alert                 Requirements                                          53A1319, Revision 2, dated April 4,
                                           Service Bulletin 737–53A1319, Revision                     SWA requested that we provide                      2014, on which the crown skin panel
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                                           2, dated April 4, 2014, will have                       clarification regarding the applicability             replacement was accomplished as
                                           exceeded the compliance times in table                  of table 2 of paragraph 1.E.,                         described previously in Figure 35 of
                                           1 upon the effective date of the AD.                    ‘‘Compliance,’’ of Boeing Alert Service               Boeing Service Bulletin 737–53–1306,
                                              SWA stated that since paragraph (n)                  Bulletin 737–53A1319, Revision 2,                     were inspected previously to determine
                                           of the proposed AD (79 FR 68381,                        dated April 4, 2014, for accomplishing                if the existing skin assembly was an
                                           November 17, 2014) provides credit for                  the repetitive inspections required by                ‘‘MPN 65C35798–1 (open pockets


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                                           51452             Federal Register / Vol. 80, No. 164 / Tuesday, August 25, 2015 / Rules and Regulations

                                           adjacent to the STR 4R lap joint)’’ or an               substantiate that the fuselage crown skin                terminating action has been developed.
                                           ‘‘MPN 65C35798–8 (closed pockets                        replacements would provide an                            Once terminating action is developed,
                                           adjacent to the STR 4R lap joint).’’ SWA                acceptable level of safety. We have not                  approved, and available, we might
                                           stated that the existing skin panel was                 changed this AD in this regard.                          consider additional rulemaking.
                                           then replaced with a new skin panel of
                                                                                                   Conclusion                                               Related Service Information Under 1
                                           the same configuration as the removed
                                           production panel. SWA explained that                      We reviewed the relevant data,                         CFR Part 51
                                           if an operator’s records show the part                  considered the comments received, and
                                                                                                   determined that air safety and the                          We reviewed Boeing Alert Service
                                           number of the skin panel assembly
                                           installed, the operator will be able to                 public interest require adopting this AD                 Bulletin 737–53A1319, Revision 2,
                                           determine if the panel is configured                    with the changes described previously                    dated April 4, 2014. The service
                                           with Condition 9 or Condition 10 and,                   and minor editorial changes. We have                     information describes procedures for
                                           therefore, SWA does not need to do the                  determined that these minor changes:                     inspections for crack indications at
                                           inspection required by paragraph (k) of                   • Are consistent with the intent that                  certain stringers, an inspection for open
                                           the proposed AD.                                        was proposed in the NPRM (79 FR                          pockets of the lower skin panel at
                                              We disagree with the commenter’s                     68381, November 17, 2014) for                            stringer S–4R, and repairs. This service
                                           requests. The fuselage crown skin                       correcting the unsafe condition; and                     information is reasonably available
                                           replacements described in Boeing                          • Do not add any additional burden                     because the interested parties have
                                           Service Bulletin 737–53–1306 are a part                 upon the public than was already                         access to it through their normal course
                                           of a SWA-specific modification                          proposed in the NPRM (79 FR 68381,                       of business or by the means identified
                                           program. We do not consider it                          November 17, 2014).                                      in the ADDRESSES section of this AD.
                                           appropriate to include various                            We also determined that these
                                           provisions in an AD that are applicable                 changes will not increase the economic                   Costs of Compliance
                                           only to a single operator’s unique use of               burden on any operator or increase the                     We estimate that this AD affects 130
                                           an affected airplane. However, an                       scope of this AD.
                                           operator may request approval of an                                                                              airplanes of U.S. registry.
                                           alternative method of compliance under                  Interim Action                                             We estimate the following costs to
                                           the provisions of paragraph (o) of this                  We consider this AD interim action.                     comply with this AD:
                                           AD if sufficient data are submitted to                  An investigation is ongoing, and no

                                                                                                                ESTIMATED COSTS
                                                                                                                                                                                               Cost on U.S.
                                                              Action                                         Labor cost                        Parts cost         Cost per product              operators

                                           Repetitive inspections [actions retained           6 or 4,270 work-hours (depending on in-        None ...........   $510 or $362,950            $66,300 or
                                             from AD 2011–08–51, Amendment                      spection method) × $85 per work-hour                              per inspection              $47,183,500 per
                                             39–16701 (76 FR 28632, May 18,                     = $510 or $362,950 per inspection                                 cycle.                      inspection cycle.
                                             2011)].                                            cycle.
                                           Repetitive inspections [new action] ........       4 or 550 work-hours (depending on in-          None ...........   $340 or $46,750 per         $44,200 or
                                                                                                spection method) × $85 per hour =                                 inspection cycle.           $6,077,500 per
                                                                                                $340 or $46,750 per inspection cycle.                                                         inspection cycle.
                                           One-time inspections [new action] ..........       5,370 work-hours × $85 per hour =              None ...........   $456,450 ................   $59,338,500.
                                                                                                $456,450.



                                             We have received no definitive data                   is within the scope of that authority                      (3) Will not affect intrastate aviation
                                           that would enable us to provide a cost                  because it addresses an unsafe condition                 in Alaska, and
                                           estimate for the on-condition actions                   that is likely to exist or develop on                      (4) Will not have a significant
                                           specified in this AD.                                   products identified in this rulemaking                   economic impact, positive or negative,
                                                                                                   action.                                                  on a substantial number of small entities
                                           Authority for This Rulemaking
                                                                                                   Regulatory Findings                                      under the criteria of the Regulatory
                                              Title 49 of the United States Code                                                                            Flexibility Act.
                                           specifies the FAA’s authority to issue                    We have determined that this AD will
                                           rules on aviation safety. Subtitle I,                                                                            List of Subjects in 14 CFR Part 39
                                                                                                   not have federalism implications under
                                           Section 106, describes the authority of                 Executive Order 13132. This AD will                        Air transportation, Aircraft, Aviation
                                           the FAA Administrator. Subtitle VII,                    not have a substantial direct effect on                  safety, Incorporation by reference,
                                           Aviation Programs, describes in more                    the States, on the relationship between                  Safety.
                                           detail the scope of the Agency’s                        the national government and the States,
                                           authority.                                                                                                       Adoption of the Amendment
                                                                                                   or on the distribution of power and
                                              We are issuing this rulemaking under                 responsibilities among the various                         Accordingly, under the authority
                                           the authority described in Subtitle VII,                levels of government.                                    delegated to me by the Administrator,
                                           Part A, Subpart III, Section 44701,                                                                              the FAA amends 14 CFR part 39 as
                                           ‘‘General requirements.’’ Under that                      For the reasons discussed above, I
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                                                                                                   certify that this AD:                                    follows:
                                           section, Congress charges the FAA with
                                           promoting safe flight of civil aircraft in                (1) Is not a ‘‘significant regulatory                  PART 39—AIRWORTHINESS
                                           air commerce by prescribing regulations                 action’’ under Executive Order 12866,                    DIRECTIVES
                                           for practices, methods, and procedures                    (2) Is not a ‘‘significant rule’’ under
                                           the Administrator finds necessary for                   DOT Regulatory Policies and Procedures                   ■ 1. The authority citation for part 39
                                           safety in air commerce. This regulation                 (44 FR 11034, February 26, 1979),                        continues to read as follows:


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                                                             Federal Register / Vol. 80, No. 164 / Tuesday, August 25, 2015 / Rules and Regulations                                              51453

                                               Authority: 49 U.S.C. 106(g), 40113, 44701.          (h) One-Time Inspections for Cracks at                or repair using a method approved in
                                                                                                   Stringers S–4L and S–4R, BS 360 to BS 908             accordance with the procedures specified in
                                           § 39.13   [Amended]                                                                                           paragraph (o) of this AD.
                                                                                                     At the applicable time specified in table 3
                                           ■ 2. The FAA amends § 39.13 by                          of paragraph 1.E., ‘‘Compliance,’’ of Boeing          (l) Corrective Action
                                                                                                   Alert Service Bulletin 737–53A1319,
                                           removing Airworthiness Directive (AD)                   Revision 2, dated April 4, 2014, except as              If any crack is found during any inspection
                                           2011–08–51, Amendment 39–16701 (76                      required by paragraph (m) of this AD: Do              required by this AD: Before further flight,
                                           FR 28632, May 18, 2011), and adding                     one-time internal detailed and eddy current           repair using a method approved in
                                           the following new AD:                                   inspections for cracks at stringers S–4R and          accordance with the procedures specified in
                                                                                                   S–4L, from BS 360 to BS 908, as applicable,           paragraph (o) of this AD. Accomplishment of
                                           2015–16–08 The Boeing Company:
                                                                                                   in accordance with Part 2 of the                      repairs approved in accordance with the
                                               Amendment 39–18233; Docket No.
                                                                                                   Accomplishment Instructions of Boeing Alert           procedures specified in paragraph (o) of this
                                               FAA–2014–0772; Directorate Identifier
                                                                                                   Service Bulletin 737–53A1319, Revision 2,             AD terminates the repetitive inspections
                                               2014–NM–090–AD.                                     dated April 4, 2014. Accomplishment of the            specified in paragraphs (g) and (j) of this AD
                                           (a) Effective Date                                      inspections required by this paragraph does           in the repaired areas only.
                                                                                                   not terminate the repetitive inspections
                                               This AD is effective September 29, 2015.            required by paragraph (g) of this AD.                 (m) Service Information Exception
                                           (b) Affected ADs                                        (i) One-Time Inspections for Cracks at                  Where Boeing Alert Service Bulletin 737–
                                             This AD replaces AD 2011–08–51,                       Stringer S–4R, BS 908 to BS 1016                      53A1319, Revision 2, dated April 4, 2014,
                                           Amendment 39–16701 (76 FR 28632, May 18,                                                                      specifies a compliance time ‘‘after the
                                                                                                      For airplanes identified as Group 2, 3, 5,         Revision 2 date of this service bulletin,’’ this
                                           2011).                                                  and 7 in Boeing Alert Service Bulletin 737–           AD requires compliance within the specified
                                           (c) Applicability                                       53A1319, Revision 2, dated April 4, 2014: At          compliance time after the effective date of
                                                                                                   the applicable time specified in table 4 of
                                             This AD applies to The Boeing Company                                                                       this AD.
                                                                                                   paragraph 1.E., ‘‘Compliance,’’ of Boeing
                                           Model 737–300, –400, and –500 series                    Alert Service Bulletin 737–53A1319,                   (n) Credit for Previous Actions
                                           airplanes, certificated in any category, as             Revision 2, dated April 4, 2014, except as
                                           identified in Boeing Alert Service Bulletin                                                                     This paragraph provides credit for actions
                                                                                                   required by paragraph (m) of this AD, do one-
                                           737–53A1319, Revision 2, dated April 4,                                                                       required by paragraph (g) of this AD, if those
                                                                                                   time internal detailed and eddy current
                                           2014.                                                                                                         actions were performed before the effective
                                                                                                   inspections for cracks at stringer S–4R, from
                                                                                                                                                         date of this AD using Boeing Alert Service
                                                                                                   BS 908 to BS 1016, in accordance with Part
                                           (d) Subject                                                                                                   Bulletin 737–53A1319, dated April 4, 2011;
                                                                                                   3 of the Accomplishment Instructions of
                                            Air Transport Association (ATA) of                     Boeing Alert Service Bulletin 737–53A1319,            or Boeing Alert Service Bulletin 737–
                                           America Code 53: Fuselage.                              Revision 2, dated April 4, 2014.                      53A1319, Revision 1, dated April 8, 2011.
                                                                                                                                                         Boeing Alert Service Bulletin 737–53A1319,
                                           (e) Unsafe Condition                                    (j) Repetitive Inspections for Cracks at              dated April 4, 2011, was incorporated by
                                              This AD was prompted by an evaluation by             Stringer S–4R, BS 908 to BS 1016                      reference in AD 2011–08–51, Amendment
                                           the design approval holder (DAH) that has                  For airplanes identified as Group 2, 3, 5,         39–16701 (76 FR 28632, May 18, 2011).
                                           determined that the lower fastener holes in             and 7 in Boeing Alert Service Bulletin 737–           Boeing Alert Service Bulletin 737–53A1319,
                                           the lower skin of the fuselage lap splice are           53A1319, Revision 2, dated April 4, 2014: At          Revision 1, dated April 8, is not incorporated
                                           subject to widespread fatigue damage (WFD).             the applicable time specified in table 5 of           by reference in this AD.
                                           We are issuing this AD to detect and correct            paragraph 1.E., ‘‘Compliance,’’ of Boeing
                                                                                                   Alert Service Bulletin 737–53A1319,                   (o) Alternative Methods of Compliance
                                           fatigue cracking of the lower fastener holes in                                                               (AMOCs)
                                           the lower skin of the fuselage lap splice,              Revision 2, dated April 4, 2014, except as
                                           which could result in reduced structural                required by paragraph (m) of this AD, do                 (1) The Manager, Los Angeles Aircraft
                                           integrity of the airplane.                              external eddy current inspections, or internal        Certification Office (ACO), FAA, has the
                                                                                                   eddy current and detailed inspections, for            authority to approve AMOCs for this AD, if
                                           (f) Compliance                                          cracks at stringer S–4R, from BS 908 to BS            requested using the procedures found in 14
                                             Comply with this AD within the                        1016, in accordance with Part 4 of the                CFR 39.19. In accordance with 14 CFR 39.19,
                                           compliance times specified, unless already              Accomplishment Instructions of Boeing Alert           send your request to your principal inspector
                                           done.                                                   Service Bulletin 737–53A1319, Revision 2,             or local Flight Standards District Office, as
                                                                                                   dated April 4, 2014. Repeat the inspection(s)         appropriate. If sending information directly
                                           (g) Repetitive Inspections for Crack                    thereafter at the applicable intervals specified      to the manager of the ACO, send it to the
                                           Indications at Stringers S–4R and S–4L,                 in table 5 of paragraph 1.E., ‘‘Compliance,’’         attention of the person identified in
                                           Body Station (BS) 360 to BS 908                         of Boeing Alert Service Bulletin 737–                 paragraph (p)(1) of this AD.
                                              At the applicable time specified in table 1          53A1319, Revision 2, dated April 4, 2014.                (2) Before using any approved AMOC,
                                           of paragraph 1.E., ‘‘Compliance,’’ of Boeing            Either inspection option may be used at any           notify your appropriate principal inspector,
                                           Alert Service Bulletin 737–53A1319,                     repetitive inspection cycle.                          or lacking a principal inspector, the manager
                                           Revision 2, dated April 4, 2014: Do an                  (k) General Visual Inspection for Open                of the local flight standards district office/
                                           external eddy current inspection, or internal           Pockets at Stringer S–4R, BS 908 to BS 1016           certificate holding district office.
                                           eddy current and detailed inspections, for                                                                       (3) An AMOC that provides an acceptable
                                                                                                      For airplanes identified as Group 1, 4, and
                                           crack indications at stringers S–4R and S–4L,           6 in Boeing Alert Service Bulletin 737–               level of safety may be used for any repair
                                           from BS 360 to BS 908, as applicable, except            53A1319, Revision 2, dated April 4, 2014: At          required by this AD if it is approved by the
                                           as provided by paragraph (h) of this AD, in             the applicable time specified in table 6 of           Boeing Commercial Airplanes Organization
                                           accordance with Part 1 of the                           paragraph 1.E., ‘‘Compliance,’’ of Boeing             Designation Authorization (ODA) that has
                                           Accomplishment Instructions of Boeing Alert             Alert Service Bulletin 737–53A1319,                   been authorized by the Manager, Los Angeles
                                           Service Bulletin 737–53A1319, Revision 2,               Revision 2, dated April 4, 2014, except as            ACO, to make those findings. For a repair
                                           dated April 4, 2014. Repeat the inspection(s)           required by paragraph (m) of this AD, do a            method to be approved, the repair must meet
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                                           thereafter at the applicable intervals specified        general visual inspection for open pockets of         the certification basis of the airplane, and the
                                           in table 1 or table 2, as applicable, of                the lower skin panel at stringer S–4R, from           approval must specifically refer to this AD.
                                           paragraph 1.E., ‘‘Compliance,’’ of Boeing               BS 908 to BS 1016, in accordance with Part               (4) AMOCs approved for AD 2011–08–51,
                                           Alert Service Bulletin 737–53A1319,                     5 of the Accomplishment Instructions of               Amendment 39–16701 (76 FR 28632, May 18,
                                           Revision 2, dated April 4, 2014. Either                 Boeing Alert Service Bulletin 737–53A1319,            2011), are approved as AMOCs for the
                                           inspection option may be used at any                    Revision 2, dated April 4, 2014. If any open          corresponding provisions of paragraphs (g)
                                           repetitive inspection cycle.                            pocket is found, before further flight, inspect       and (l) of this AD.



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                                           51454             Federal Register / Vol. 80, No. 164 / Tuesday, August 25, 2015 / Rules and Regulations

                                           (p) Related Information                                 ACTION:   Final rule.                                 SUPPLEMENTARY INFORMATION:
                                             (1) For more information about this AD,                                                                     Discussion
                                           contact Jennifer Tsakoumakis, Aerospace                 SUMMARY:    We are adopting a new
                                           Engineer, Airframe Branch, ANM–120L,                    airworthiness directive (AD) for Airbus                  On March 27, 2015, at 80 FR 16325,
                                           FAA, Los Angeles Aircraft Certification                 Helicopters Model AS350B, AS350BA,                    the Federal Register published our
                                           Office (ACO), 3960 Paramount Boulevard,                 AS350B1, AS350B2, AS350B3, AS350C,                    notice of proposed rulemaking (NPRM),
                                           Lakewood, CA 90712–4137; phone: 562–627–                AS350D, AS350D1, AS355E, AS355F,                      which proposed to amend 14 CFR part
                                           5264; fax: 562–627–5210; email:                         AS355F1, AS355F2, AS355N, AS355NP,                    39 by adding an AD that would apply
                                           jennifer.tsakoumakis@faa.gov.
                                                                                                   EC130B4, and EC130T2 helicopters.                     to Airbus Helicopters Model AS350B,
                                             (2) Service information identified in this
                                           AD that is not incorporated by reference is             This AD requires inspecting the                       AS350BA, AS350B1, AS350B2,
                                           available at the addresses specified in                 swashplate assembly rotating star to                  AS350B3, AS350C, AS350D, AS350D1,
                                           paragraphs (q)(4) and (q)(5) of this AD.                determine whether a ferrule was                       AS355E, AS355F, AS355F1, AS355F2,
                                                                                                   installed. If a ferrule exists, this AD               AS355N, AS355NP, EC130B4, and
                                           (q) Material Incorporated by Reference
                                                                                                   requires inspecting the rotating star for             EC130T2 helicopters with a swashplate
                                              (1) The Director of the Federal Register             a crack and removing any cracked                      assembly with rotating star, part number
                                           approved the incorporation by reference                 rotating star. This AD was prompted by                (P/N) 350A371003–04, 350A371003–05,
                                           (IBR) of the service information listed in this
                                           paragraph under 5 U.S.C. 552(a) and 1 CFR
                                                                                                   a report that reconditioning the rotating             350A371003–06, 350A371003–07, or
                                           part 51.                                                swashplate per a certain repair                       350A371003–08. The NPRM proposed
                                              (2) You must use this service information            procedure could result in the rotating                to require inspecting the swashplate
                                           as applicable to do the actions required by             star cracking. The actions of this AD are             assembly rotating star to determine
                                           this AD, unless the AD specifies otherwise.             intended to detect a crack in the rotating            whether a ferrule was installed. If a
                                              (3) The following service information was            star and prevent failure of the rotating              ferrule exists, this proposed AD would
                                           approved for IBR on September 29, 2015.                 star and subsequent loss of control of                require inspecting the rotating star for a
                                              (i) Boeing Alert Service Bulletin 737–               the helicopter.                                       crack and removing any cracked rotating
                                           53A1319, Revision 2, dated April 4, 2014.
                                                                                                   DATES: This AD is effective September                 star. The proposed requirements were
                                              (ii) Reserved.
                                              (4) For Boeing service information                   29, 2015.                                             intended to detect a crack in the rotating
                                           identified in this AD, contact Boeing                      The Director of the Federal Register               star and prevent failure of the rotating
                                           Commercial Airplanes, Attention: Data &                 approved the incorporation by reference               star and subsequent loss of control of
                                           Services Management, P.O. Box 3707, MC                  of certain documents listed in this AD                the helicopter.
                                           2H–65, Seattle, WA 98124–2207; telephone                as of September 29, 2015.                                The NPRM was prompted by AD No.
                                           206–544–5000, extension 1; fax 206–766–                                                                       2014–0132R1, dated June 2, 2014,
                                           5680; Internet https://                                 ADDRESSES: For service information
                                                                                                                                                         issued by EASA, which is the Technical
                                           www.myboeingfleet.com.                                  identified in this AD, contact Airbus
                                                                                                                                                         Agent for the Member States of the
                                              (5) You may view this referenced service             Helicopters, Inc., 2701 N. Forum Drive,
                                                                                                                                                         European Union. EASA AD No. 2014–
                                           information at the FAA, Transport Airplane              Grand Prairie, TX 75052; telephone
                                                                                                                                                         0132R1 corrects an unsafe condition for
                                           Directorate, 1601 Lind Avenue SW., Renton,              (972) 641–0000 or (800) 232–0323; fax
                                           WA. For information on the availability of                                                                    Airbus Helicopters (previously
                                                                                                   (972) 641–3775; or at http://
                                           this material at the FAA, call 425–227–1221.                                                                  Eurocopter France) Model AS 350 B,
                                                                                                   www.airbushelicopters.com/techpub.
                                              (6) You may view this service information                                                                  BA, BB, B1, B2, B3, D, AS 355 E, F, F1,
                                                                                                   You may review the referenced service
                                           that is incorporated by reference at the                                                                      F2, N, NP, EC 130 B4, and T2
                                                                                                   information at the FAA, Office of the
                                           National Archives and Records                                                                                 helicopters if equipped with a
                                           Administration (NARA). For information on               Regional Counsel, Southwest Region,
                                                                                                                                                         swashplate assembly with a rotating
                                           the availability of this material at NARA, call         10101 Hillwood Pkwy., Room 6N–321,
                                                                                                                                                         star, P/N 350A371003–04, P/N
                                           202–741–6030, or go to: http://                         Fort Worth, Texas 76177.
                                                                                                                                                         350A371003–05, P/N 350A371003–06,
                                           www.archives.gov/federal-register/cfr/ibr-
                                                                                                   Examining the AD Docket                               P/N 350A371003–07, or P/N
                                           locations.html.
                                                                                                     You may examine the AD docket on                    350A371003–08. EASA advises that
                                              Issued in Renton, Washington, on August                                                                    during a repair of a helicopter, it was
                                           7, 2015.                                                the Internet at http://
                                                                                                   www.regulations.gov or in person at the               discovered that rotating swashplates
                                           Jeffrey E. Duven,                                                                                             reconditioned in accordance with a
                                                                                                   Docket Operations Office between 9
                                           Manager, Transport Airplane Directorate,                                                                      certain repair procedure could
                                           Aircraft Certification Service.                         a.m. and 5 p.m., Monday through
                                                                                                   Friday, except Federal holidays. The AD               experience a high stress level. This
                                           [FR Doc. 2015–20372 Filed 8–24–15; 8:45 am]
                                                                                                   docket contains this AD, the European                 condition, if not corrected, could affect
                                           BILLING CODE 4910–13–P
                                                                                                   Aviation Safety Agency (EASA) AD, any                 the service life of the part. To address
                                                                                                   incorporated-by-reference service                     this unsafe condition, EASA AD No.
                                                                                                   information, the economic evaluation,                 2014–0132R1 requires repetitive
                                           DEPARTMENT OF TRANSPORTATION                                                                                  inspections and replacement of the
                                                                                                   any comments received, and other
                                                                                                   information. The street address for the               rotating star.
                                           Federal Aviation Administration
                                                                                                   Docket Operations Office (phone: 800–                 Comments
                                           14 CFR Part 39                                          647–5527) is U.S. Department of                         We gave the public the opportunity to
                                                                                                   Transportation, Docket Operations                     participate in developing this AD, but
                                           [Docket No. FAA–2015–0673; Directorate                  Office, M–30, West Building Ground
                                           Identifier 2014–SW–034–AD; Amendment                                                                          we received no comments on the NPRM
                                           39–18244; AD 2015–17–11]
                                                                                                   Floor, Room W12–140, 1200 New Jersey                  (80 FR 16325, March 27, 2015).
                                                                                                   Avenue SE., Washington, DC 20590.
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                                           RIN 2120–AA64                                           FOR FURTHER INFORMATION CONTACT:                      FAA’s Determination
                                                                                                   Robert Grant, Aviation Safety Engineer,                 These helicopters have been approved
                                           Airworthiness Directives; Airbus
                                                                                                   Safety Management Group, FAA, 10101                   by the aviation authority of France and
                                           Helicopters
                                                                                                   Hillwood Pkwy., Fort Worth, Texas                     are approved for operation in the United
                                           AGENCY:Federal Aviation                                 76177; telephone (817) 222–5110; email:               States. Pursuant to our bilateral
                                           Administration (FAA), DOT.                              robert.grant@faa.gov.                                 agreement with France, EASA, its


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Document Created: 2018-02-23 11:03:08
Document Modified: 2018-02-23 11:03:08
CategoryRegulatory Information
CollectionFederal Register
sudoc ClassAE 2.7:
GS 4.107:
AE 2.106:
PublisherOffice of the Federal Register, National Archives and Records Administration
SectionRules and Regulations
ActionFinal rule.
DatesThis AD is effective September 29, 2015.
ContactJennifer Tsakoumakis, Aerospace Engineer, Airframe Branch, ANM-120L, FAA, Los Angeles Aircraft Certification Office (ACO), 3960 Paramount Boulevard, Lakewood, CA 90712-4137; phone: 562-627-5264; fax: 562-627-5210; email: [email protected]
FR Citation80 FR 51450 
RIN Number2120-AA64
CFR AssociatedAir Transportation; Aircraft; Aviation Safety; Incorporation by Reference and Safety

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