81_FR_29597 81 FR 29505 - Airworthiness Directives; The Boeing Company Airplanes

81 FR 29505 - Airworthiness Directives; The Boeing Company Airplanes

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration

Federal Register Volume 81, Issue 92 (May 12, 2016)

Page Range29505-29508
FR Document2016-11167

We propose to supersede Airworthiness Directive (AD) 2013-19- 04, which applies to certain The Boeing Company Model 737-600, -700, - 700C, -800, and -900 series airplanes. AD 2013-19-04 currently requires repetitive detailed and high frequency eddy current (HFEC) inspections for cracking of the skin around the eight fasteners common to the ends of the station (STA) 540 bulkhead chords between stringers S-22 and S- 23, left and right sides; related investigative actions and corrective actions, if necessary; and provides an optional terminating modification. Since we issued AD 2013-19-04, we have received reports of additional cracks that are larger and initiated sooner than previously predicted. This proposed AD would reduce the inspection threshold and repetitive inspection intervals. We are proposing this AD to detect and correct fatigue cracking in the fuselage skin around the eight fasteners securing the STA 540 bulkhead chords. Such cracking can result in rapid decompression of the cabin.

Federal Register, Volume 81 Issue 92 (Thursday, May 12, 2016)
[Federal Register Volume 81, Number 92 (Thursday, May 12, 2016)]
[Proposed Rules]
[Pages 29505-29508]
From the Federal Register Online  [www.thefederalregister.org]
[FR Doc No: 2016-11167]


========================================================================
Proposed Rules
                                                Federal Register
________________________________________________________________________

This section of the FEDERAL REGISTER contains notices to the public of 
the proposed issuance of rules and regulations. The purpose of these 
notices is to give interested persons an opportunity to participate in 
the rule making prior to the adoption of the final rules.

========================================================================


Federal Register / Vol. 81, No. 92 / Thursday, May 12, 2016 / 
Proposed Rules

[[Page 29505]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2016-6670; Directorate Identifier 2016-NM-006-AD]
RIN 2120-AA64


Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

-----------------------------------------------------------------------

SUMMARY: We propose to supersede Airworthiness Directive (AD) 2013-19-
04, which applies to certain The Boeing Company Model 737-600, -700, -
700C, -800, and -900 series airplanes. AD 2013-19-04 currently requires 
repetitive detailed and high frequency eddy current (HFEC) inspections 
for cracking of the skin around the eight fasteners common to the ends 
of the station (STA) 540 bulkhead chords between stringers S-22 and S-
23, left and right sides; related investigative actions and corrective 
actions, if necessary; and provides an optional terminating 
modification. Since we issued AD 2013-19-04, we have received reports 
of additional cracks that are larger and initiated sooner than 
previously predicted. This proposed AD would reduce the inspection 
threshold and repetitive inspection intervals. We are proposing this AD 
to detect and correct fatigue cracking in the fuselage skin around the 
eight fasteners securing the STA 540 bulkhead chords. Such cracking can 
result in rapid decompression of the cabin.

DATES: We must receive comments on this proposed AD by June 27, 2016.

ADDRESSES: You may send comments, using the procedures found in 14 CFR 
11.43 and 11.45, by any of the following methods:
     Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments.
     Fax: 202-493-2251.
     Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue SE., Washington, DC 20590.
     Hand Delivery: Deliver to Mail address above between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    For service information identified in this NPRM, 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-2016-6670.

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-2016-
6670; 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 proposed AD, the regulatory evaluation, any comments 
received, and other information. The street address for the Docket 
Office (phone: 800-647-5527) is in the ADDRESSES section. Comments will 
be available in the AD docket shortly after receipt.

FOR FURTHER INFORMATION CONTACT: Alan Pohl, Aerospace Engineer, 
Airframe Branch, ANM-120S, FAA, Seattle Aircraft Certification Office, 
1601 Lind Avenue SW., Renton, WA 98057-3356; phone: 425-917-6450; fax: 
425-917-6590; email: [email protected].

SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to send any written relevant data, views, or 
arguments about this proposed AD. Send your comments to an address 
listed under the ADDRESSES section. Include ``Docket No. FAA-2016-6670; 
Directorate Identifier 2016-NM-006-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of this proposed AD. We 
will consider all comments received by the closing date and may amend 
this proposed AD because of those comments.
    We will post all comments we receive, without change, to http://www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact we 
receive about this proposed AD.

Discussion

    On September 9, 2013, we issued AD 2013-19-04, Amendment 39-17586 
(78 FR 59801, September 30, 2013) (``AD 2013-19-04''), for certain The 
Boeing Company Model 737-600, -700, -700C, -800, and -900 series 
airplanes. AD 2013-19-04 requires repetitive detailed and HFEC 
inspections for cracking of the skin around the eight fasteners common 
to the ends of the STA 540 bulkhead chords between stringers S-22 and 
S-23, left and right sides; related investigative actions and 
corrective actions, if necessary; and provides an optional terminating 
modification. AD 2013-19-04 resulted from a report of cracks found in 
the skin at body STA 540 just below the left side of stringer S-22 on a 
Model 737-700 series airplane. We issued AD 2013-19-04 to detect and 
correct fatigue cracking in the fuselage skin around the eight 
fasteners securing the STA 540 bulkhead chords, which can result in 
rapid decompression of the cabin.

Actions Since AD 2013-19-04 Was Issued

    Since we issued AD 2013-19-04, we have received reports of cracks 
that initiated sooner and are larger than previously predicted.

Related Service Information Under 1 CFR Part 51

    We reviewed Boeing Special Attention Service Bulletin 737-53-1294, 
Revision 2, dated December 9, 2015, which specifies procedures for 
doing inspections for cracking of the skin around the eight fasteners 
common to the ends of the STA 540 bulkhead chords between stringers S-
22 and S-23, left and right sides, repairing cracks,

[[Page 29506]]

and installing a chord splice as a preventive modification on crack-
free skin. 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.

FAA's Determination

    We are proposing this AD because we evaluated all the relevant 
information and determined the unsafe condition described previously is 
likely to exist or develop in other products of the same type designs.

Proposed AD Requirements

    Although this proposed AD does not explicitly restate the 
requirements of AD 2013-19-04, this proposed AD would retain all of the 
requirements of AD 2013-19-04. Those requirements are referenced in the 
service information identified previously, which, in turn, is 
referenced in paragraphs (g) through (k) of this proposed AD. This 
proposed AD would require accomplishing the actions specified in the 
service information described previously, except as discussed under 
``Differences Between this Proposed AD and the Service Information.'' 
For information on the procedures and compliance times, see this 
service information at http://www.regulations.gov by searching for and 
locating Docket No. FAA-2016-6670.
    The phrase ``related investigative actions'' is used in this 
proposed AD. Related investigative actions are follow-on actions that 
(1) are related to the primary action, and (2) further investigate the 
nature of any condition found. Related investigative actions in an AD 
could include, for example, inspections.
    The phrase ``corrective actions'' is used in this proposed AD. 
Corrective actions correct or address any condition found. Corrective 
actions in an AD could include, for example, repairs.

Differences Between This Proposed AD and the Service Information

    Boeing Special Attention Service Bulletin 737-53-1294, Revision 2, 
dated December 9, 2015, specifies to contact the manufacturer for 
instructions on how to repair certain conditions, but this proposed AD 
would require accomplishment of repair methods, modification 
deviations, and alteration deviations in one of the following ways:
     In accordance with a method that we approve; or
     Using data that meet the certification basis of the 
airplane, and that have been approved by the Boeing Commercial 
Airplanes Organization Designation Authorization (ODA) whom we have 
authorized to make those findings.

Costs of Compliance

    We estimate that this proposed AD affects 903 airplanes of U.S. 
registry. We estimate the following costs to comply with this proposed 
AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                                 Cost on U.S.
             Action                    Labor cost         Parts cost      Cost per product        operators
----------------------------------------------------------------------------------------------------------------
Inspection (left and right side   12 work-hours x $85              $0   $1,020 per           $921,060 per
 skins).                           per hour = $1,020                     inspection cycle.    inspection cycle.
                                   per inspection
                                   cycle.
----------------------------------------------------------------------------------------------------------------

    We estimate the following costs to do any necessary repairs and 
inspections that would be required based on the results of the proposed 
inspection. We have no way of determining the number of aircraft that 
might need these repairs:

                                               On-Condition Costs
----------------------------------------------------------------------------------------------------------------
              Action                      Labor cost               Parts cost               Cost per product
----------------------------------------------------------------------------------------------------------------
Preventive modification (each       7 work-hours x $85     $894......................  $1,489.
 side).                              per hour = $595.
Skin repair (each side)...........  39 work-hours x $85    Up to $5,635..............  Up to $8,950.
                                     per hour = $3,315.
----------------------------------------------------------------------------------------------------------------

    According to the manufacturer, some of the costs of this proposed 
AD may be covered under warranty, thereby reducing the cost impact on 
affected individuals. We do not control warranty coverage for affected 
individuals. As a result, we have included all costs in our cost 
estimate.

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 proposed AD would not have federalism 
implications under Executive Order 13132. This proposed AD would 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 the proposed 
regulation:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866,
    (2) Is not a ``significant rule'' under the 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.

[[Page 29507]]

List of Subjects in 14 CFR Part 39

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

The Proposed Amendment

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

PART 39--AIRWORTHINESS DIRECTIVES

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

    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) 
2013-19-04, Amendment 39-17586 (78 FR 59801, September 30, 2013), and 
adding the following new AD:

The Boeing Company: Docket No. FAA-2016-6670; Directorate Identifier 
2016-NM-006-AD.

(a) Comments Due Date

    The FAA must receive comments on this AD action by June 27, 
2016.

(b) Affected ADs

    This AD replaces AD 2013-19-04, Amendment 39-17586 (78 FR 59801, 
September 30, 2013) (``AD 2013-19-04'').

(c) Applicability

    This AD applies to The Boeing Company Model 737-600, -700, -
700C, -800, and -900 series airplanes; certificated in any category; 
as identified in Boeing Special Attention Service Bulletin 737-53-
1294, Revision 2, dated December 9, 2015.

(d) Subject

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

(e) Unsafe Condition

    This AD was prompted by a report of cracks found in the skin at 
body station (STA) 540 just below the left side of stringer S-22. We 
are issuing this AD to detect and correct fatigue cracking in the 
fuselage skin around the eight fasteners securing the STA 540 
bulkhead chords, which can result in rapid decompression of the 
cabin.

(f) Compliance

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

(g) Inspection and Corrective Action

    Except as required by paragraphs (i)(1) and (i)(2) of this AD, 
at the applicable time specified in table 1 of paragraph 1.E. 
``Compliance,'' of Boeing Special Attention Service Bulletin 737-53-
1294, Revision 2, dated December 9, 2015: Do detailed and high 
frequency eddy current (HFEC) inspections for cracking of the skin 
in the area around the eight fasteners securing the STA 540 bulkhead 
chords between stringers S-22 and S-23; and do all applicable 
related investigative and corrective actions; in accordance with 
Parts 1, 2, 3, 4, and 5 of the Accomplishment Instructions of Boeing 
Special Attention Service Bulletin 737-53-1294, Revision 2, dated 
December 9, 2015, except as required by paragraphs (i)(3) and (i)(4) 
of this AD. Do all applicable related investigative and corrective 
actions before further flight. Repeat the detailed and HFEC 
inspections thereafter at the intervals specified in table 1 of 
paragraph 1.E., ``Compliance,'' of Boeing Special Attention Service 
Bulletin 737-53-1294, Revision 2, dated December 9, 2015, until the 
optional preventive modification specified in paragraph (h) of this 
AD is done.

(h) Optional Preventive Modification

    Accomplishing the preventive modification or repair, including 
an HFEC inspection for cracking of the skin and STA 540 bulkhead 
chords, and all applicable repairs, in accordance with paragraph 
3.B, Part 2 or Part 4 (left side), and Part 3 or Part 5 (right 
side), of the Accomplishment Instructions of Boeing Special 
Attention Service Bulletin 737-53-1294, Revision 2, dated December 
9, 2015, except as required by paragraph (i)(2) of this AD, 
terminates the inspection requirements of paragraph (g) of this AD 
for the side on which the modification is done.

(i) Exceptions to Service Bulletin Specifications

    (1) Where paragraph 1.E., ``Compliance,'' of Boeing Special 
Attention Service Bulletin 737-53-1294, Revision 2, dated December 
9, 2015, 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.
    (2) For airplanes on which Boeing Business Jet Lower Cabin 
Altitude Supplemental Type Certificate (STC) ST01697SE (http://
rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/
0812969a86af879b8625766400600105/$FILE/ST01697SE.pdf) (6,500 feet 
maximum cabin altitude in lieu of 8,000 feet) has been incorporated, 
the flight-cycle related compliance times for the inspection 
required by paragraph (g) of this AD are different from those 
specified in paragraph 1.E., ``Compliance,'' of Boeing Special 
Attention Service Bulletin 737-53-1294, Revision 2, dated December 
9, 2015. All initial compliance times specified in total flight 
cycles or flight cycles must be reduced to half of those specified 
in Boeing Special Attention Service Bulletin 737-53-1294, Revision 
2, dated December 9, 2015. All repetitive interval compliance times 
specified in flight cycles must be reduced to one-quarter of those 
specified in paragraph 1.E., ``Compliance,'' of Boeing Special 
Attention Service Bulletin 737-53-1294, Revision 2, dated December 
9, 2015.
    (3) If any cracking is found during any inspection required by 
this AD, and Boeing Special Attention Service Bulletin 737-53-1294, 
Revision 2, dated December 9, 2015, specifies to contact Boeing for 
appropriate action: Before further flight, repair using a method 
approved in accordance with the procedures specified in paragraph 
(l) of this AD.
    (4) The access and restoration instructions identified in the 
Accomplishment Instructions of Boeing Special Attention Service 
Bulletin 737-53-1294, Revision 2, dated December 9, 2015, are not 
required by this AD. Operators may perform those actions in 
accordance with approved maintenance procedures.

(j) Part 26 Supplemental Inspections Not Required by This AD

    Table 2 of paragraph 1.E., ``Compliance,'' of Boeing Special 
Attention Service Bulletin 737-53-1294, Revision 2, dated December 
9, 2015, specifies post-modification airworthiness limitation 
inspections in compliance with 14 CFR 25.571(a)(3) at the modified 
locations, which support compliance with 14 CFR 121.1109(c)(2) or 
129.109(b)(2). As airworthiness limitations, these inspections are 
required by maintenance and operational rules. It is therefore 
unnecessary to mandate them in this AD. Deviations from these 
inspections require FAA approval, but do not require an alternative 
method of compliance.

(k) Credit for Previous Actions

    This paragraph provides credit for the actions required by 
paragraphs (g) and (h) of this AD, if those actions were performed 
before the effective date of this AD using Boeing Special Attention 
Service Bulletin 737-53-1294, dated March 31, 2011, which is not 
incorporated by reference in this AD; or Boeing Special Attention 
Service Bulletin 737-53-1294, Revision 1, dated June 14, 2013, which 
is incorporated by reference in AD 2013-19-04.

(l) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, Seattle 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 (m) of this AD. 
Information may be emailed to: [email protected].
    (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, modification, or alteration required by this AD 
if it is approved by the Boeing Commercial Airplanes Organization 
Designation Authorization (ODA) that has been authorized by the 
Manager, Seattle ACO, to make those findings. To be approved, the 
repair method, modification deviation, or alteration deviation must 
meet the certification basis of the airplane, and the approval must 
specifically refer to this AD.

[[Page 29508]]

    (4) AMOCs approved previously for the optional preventive 
modification installed in accordance with paragraph (h) of AD 2013-
19-04, and AMOCs approved previously for repairs for AD 2013-19-04, 
are approved as AMOCs for the corresponding provisions of this AD, 
provided that such modification or repair included installation of 
the splice plate as specified in Boeing Special Attention Service 
Bulletin 737-53-1294, except as provided by paragraph (l)(5) of this 
AD.
    (5) The time-limited repair approved as specified in FAA Letter 
120S-15-140, dated June 3, 2015, is approved as an AMOC to the 
corresponding requirements of this AD.

(m) Related Information

    (1) For more information about this AD, contact Alan Pohl, 
Aerospace Engineer, Airframe Branch, ANM-120S, FAA, Seattle Aircraft 
Certification Office, 1601 Lind Avenue SW., Renton, WA 98057-3356; 
phone: 425-917-6450; fax: 425-917-6590; email: [email protected].
    (2) 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. 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.

    Issued in Renton, Washington, on May 5, 2016.
Michael Kaszycki,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2016-11167 Filed 5-11-16; 8:45 am]
 BILLING CODE 4910-13-P



                                                                                                                                                                                                     29505

                                                    Proposed Rules                                                                                                Federal Register
                                                                                                                                                                  Vol. 81, No. 92

                                                                                                                                                                  Thursday, May 12, 2016



                                                    This section of the FEDERAL REGISTER                      • Fax: 202–493–2251.                                FAA–2016–6670; Directorate Identifier
                                                    contains notices to the public of the proposed            • Mail: U.S. Department of                          2016–NM–006–AD’’ at the beginning of
                                                    issuance of rules and regulations. The                  Transportation, Docket Operations, M–                 your comments. We specifically invite
                                                    purpose of these notices is to give interested          30, West Building Ground Floor, Room                  comments on the overall regulatory,
                                                    persons an opportunity to participate in the            W12–140, 1200 New Jersey Avenue SE.,                  economic, environmental, and energy
                                                    rule making prior to the adoption of the final
                                                                                                            Washington, DC 20590.                                 aspects of this proposed AD. We will
                                                    rules.
                                                                                                              • Hand Delivery: Deliver to Mail                    consider all comments received by the
                                                                                                            address above between 9 a.m. and 5                    closing date and may amend this
                                                    DEPARTMENT OF TRANSPORTATION                            p.m., Monday through Friday, except                   proposed AD because of those
                                                                                                            Federal holidays.                                     comments.
                                                    Federal Aviation Administration                           For service information identified in                 We will post all comments we
                                                                                                            this NPRM, contact Boeing Commercial                  receive, without change, to http://
                                                    14 CFR Part 39                                          Airplanes, Attention: Data & Services                 www.regulations.gov, including any
                                                                                                            Management, P.O. Box 3707, MC 2H–65,                  personal information you provide. We
                                                    [Docket No. FAA–2016–6670; Directorate                  Seattle, WA 98124–2207; telephone                     will also post a report summarizing each
                                                    Identifier 2016–NM–006–AD]
                                                                                                            206–544–5000, extension 1; fax 206–                   substantive verbal contact we receive
                                                    RIN 2120–AA64                                           766–5680; Internet https://                           about this proposed AD.
                                                                                                            www.myboeingfleet.com. You may view                   Discussion
                                                    Airworthiness Directives; The Boeing                    this referenced service information at
                                                    Company Airplanes                                       the FAA, Transport Airplane                             On September 9, 2013, we issued AD
                                                                                                            Directorate, 1601 Lind Avenue SW.,                    2013–19–04, Amendment 39–17586 (78
                                                    AGENCY: Federal Aviation
                                                                                                            Renton, WA. For information on the                    FR 59801, September 30, 2013) (‘‘AD
                                                    Administration (FAA), DOT.
                                                                                                            availability of this material at the FAA,             2013–19–04’’), for certain The Boeing
                                                    ACTION: Notice of proposed rulemaking                                                                         Company Model 737–600, –700, –700C,
                                                    (NPRM).                                                 call 425–227–1221. It is also available
                                                                                                            on the Internet at http://                            –800, and –900 series airplanes. AD
                                                    SUMMARY:   We propose to supersede                      www.regulations.gov by searching for                  2013–19–04 requires repetitive detailed
                                                    Airworthiness Directive (AD) 2013–19–                   and locating Docket No. FAA–2016–                     and HFEC inspections for cracking of
                                                    04, which applies to certain The Boeing                 6670.                                                 the skin around the eight fasteners
                                                    Company Model 737–600, –700, –700C,                                                                           common to the ends of the STA 540
                                                                                                            Examining the AD Docket                               bulkhead chords between stringers S–22
                                                    –800, and –900 series airplanes. AD
                                                    2013–19–04 currently requires                              You may examine the AD docket on                   and S–23, left and right sides; related
                                                    repetitive detailed and high frequency                  the Internet at http://                               investigative actions and corrective
                                                    eddy current (HFEC) inspections for                     www.regulations.gov by searching for                  actions, if necessary; and provides an
                                                    cracking of the skin around the eight                   and locating Docket No. FAA–2016–                     optional terminating modification. AD
                                                    fasteners common to the ends of the                     6670; or in person at the Docket                      2013–19–04 resulted from a report of
                                                    station (STA) 540 bulkhead chords                       Management Facility between 9 a.m.                    cracks found in the skin at body STA
                                                    between stringers S–22 and S–23, left                   and 5 p.m., Monday through Friday,                    540 just below the left side of stringer
                                                    and right sides; related investigative                  except Federal holidays. The AD docket                S–22 on a Model 737–700 series
                                                    actions and corrective actions, if                      contains this proposed AD, the                        airplane. We issued AD 2013–19–04 to
                                                    necessary; and provides an optional                     regulatory evaluation, any comments                   detect and correct fatigue cracking in
                                                    terminating modification. Since we                      received, and other information. The                  the fuselage skin around the eight
                                                    issued AD 2013–19–04, we have                           street address for the Docket Office                  fasteners securing the STA 540
                                                    received reports of additional cracks                   (phone: 800–647–5527) is in the                       bulkhead chords, which can result in
                                                    that are larger and initiated sooner than               ADDRESSES section. Comments will be                   rapid decompression of the cabin.
                                                    previously predicted. This proposed AD                  available in the AD docket shortly after              Actions Since AD 2013–19–04 Was
                                                    would reduce the inspection threshold                   receipt.                                              Issued
                                                    and repetitive inspection intervals. We                 FOR FURTHER INFORMATION CONTACT:
                                                                                                                                                                    Since we issued AD 2013–19–04, we
                                                    are proposing this AD to detect and                     Alan Pohl, Aerospace Engineer,                        have received reports of cracks that
                                                    correct fatigue cracking in the fuselage                Airframe Branch, ANM–120S, FAA,                       initiated sooner and are larger than
                                                    skin around the eight fasteners securing                Seattle Aircraft Certification Office,                previously predicted.
                                                    the STA 540 bulkhead chords. Such                       1601 Lind Avenue SW., Renton, WA
                                                    cracking can result in rapid                            98057–3356; phone: 425–917–6450; fax:                 Related Service Information Under 1
                                                    decompression of the cabin.                             425–917–6590; email: alan.pohl@                       CFR Part 51
                                                    DATES: We must receive comments on                      faa.gov.                                                We reviewed Boeing Special
jstallworth on DSK7TPTVN1PROD with PROPOSALS




                                                    this proposed AD by June 27, 2016.                      SUPPLEMENTARY INFORMATION:                            Attention Service Bulletin 737–53–
                                                    ADDRESSES: You may send comments,                                                                             1294, Revision 2, dated December 9,
                                                    using the procedures found in 14 CFR                    Comments Invited                                      2015, which specifies procedures for
                                                    11.43 and 11.45, by any of the following                  We invite you to send any written                   doing inspections for cracking of the
                                                    methods:                                                relevant data, views, or arguments about              skin around the eight fasteners common
                                                       • Federal eRulemaking Portal: Go to                  this proposed AD. Send your comments                  to the ends of the STA 540 bulkhead
                                                    http://www.regulations.gov. Follow the                  to an address listed under the                        chords between stringers S–22 and S–
                                                    instructions for submitting comments.                   ADDRESSES section. Include ‘‘Docket No.               23, left and right sides, repairing cracks,


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                                                    29506                         Federal Register / Vol. 81, No. 92 / Thursday, May 12, 2016 / Proposed Rules

                                                    and installing a chord splice as a                               of this proposed AD. This proposed AD                    Differences Between This Proposed AD
                                                    preventive modification on crack-free                            would require accomplishing the                          and the Service Information
                                                    skin. This service information is                                actions specified in the service                            Boeing Special Attention Service
                                                    reasonably available because the                                 information described previously,                        Bulletin 737–53–1294, Revision 2, dated
                                                    interested parties have access to it                             except as discussed under ‘‘Differences                  December 9, 2015, specifies to contact
                                                    through their normal course of business                          Between this Proposed AD and the                         the manufacturer for instructions on
                                                    or by the means identified in the                                Service Information.’’ For information                   how to repair certain conditions, but
                                                    ADDRESSES section.                                               on the procedures and compliance                         this proposed AD would require
                                                                                                                     times, see this service information at                   accomplishment of repair methods,
                                                    FAA’s Determination
                                                                                                                     http://www.regulations.gov by searching                  modification deviations, and alteration
                                                      We are proposing this AD because we                            for and locating Docket No. FAA–2016–                    deviations in one of the following ways:
                                                    evaluated all the relevant information                           6670.                                                       • In accordance with a method that
                                                    and determined the unsafe condition                                The phrase ‘‘related investigative                     we approve; or
                                                    described previously is likely to exist or                       actions’’ is used in this proposed AD.                      • Using data that meet the
                                                    develop in other products of the same                            Related investigative actions are follow-                certification basis of the airplane, and
                                                    type designs.                                                    on actions that (1) are related to the                   that have been approved by the Boeing
                                                                                                                     primary action, and (2) further                          Commercial Airplanes Organization
                                                    Proposed AD Requirements
                                                                                                                     investigate the nature of any condition                  Designation Authorization (ODA) whom
                                                      Although this proposed AD does not                             found. Related investigative actions in                  we have authorized to make those
                                                    explicitly restate the requirements of AD                        an AD could include, for example,                        findings.
                                                    2013–19–04, this proposed AD would                               inspections.
                                                    retain all of the requirements of AD                               The phrase ‘‘corrective actions’’ is                   Costs of Compliance
                                                    2013–19–04. Those requirements are                               used in this proposed AD. Corrective                        We estimate that this proposed AD
                                                    referenced in the service information                            actions correct or address any condition                 affects 903 airplanes of U.S. registry. We
                                                    identified previously, which, in turn, is                        found. Corrective actions in an AD                       estimate the following costs to comply
                                                    referenced in paragraphs (g) through (k)                         could include, for example, repairs.                     with this proposed AD:

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

                                                    Inspection (left and right             12 work-hours × $85 per hour = $1,020                        $0           $1,020 per inspection            $921,060 per inspection
                                                      side skins).                           per inspection cycle.                                                     cycle.                           cycle.



                                                      We estimate the following costs to do                          that would be required based on the                      have no way of determining the number
                                                    any necessary repairs and inspections                            results of the proposed inspection. We                   of aircraft that might need these repairs:

                                                                                                                                  ON-CONDITION COSTS
                                                                                                                                                                                                                       Cost per
                                                                                  Action                                                             Labor cost                                Parts cost              product

                                                    Preventive modification (each side) ..........................           7 work-hours × $85 per hour = $595 ........................   $894 .................   $1,489.
                                                    Skin repair (each side) ..............................................   39 work-hours × $85 per hour = $3,315 ...................     Up to $5,635 .....       Up to $8,950.



                                                      According to the manufacturer, some                            ‘‘General requirements.’’ Under that                     on the distribution of power and
                                                    of the costs of this proposed AD may be                          section, Congress charges the FAA with                   responsibilities among the various
                                                    covered under warranty, thereby                                  promoting safe flight of civil aircraft in               levels of government.
                                                    reducing the cost impact on affected                             air commerce by prescribing regulations                    For the reasons discussed above, I
                                                    individuals. We do not control warranty                          for practices, methods, and procedures                   certify that the proposed regulation:
                                                    coverage for affected individuals. As a                          the Administrator finds necessary for
                                                    result, we have included all costs in our                        safety in air commerce. This regulation                    (1) Is not a ‘‘significant regulatory
                                                    cost estimate.                                                   is within the scope of that authority                    action’’ under Executive Order 12866,
                                                                                                                     because it addresses an unsafe condition                   (2) Is not a ‘‘significant rule’’ under
                                                    Authority for This Rulemaking
                                                                                                                     that is likely to exist or develop on                    the DOT Regulatory Policies and
                                                      Title 49 of the United States Code                             products identified in this rulemaking                   Procedures (44 FR 11034, February 26,
                                                    specifies the FAA’s authority to issue                           action.                                                  1979),
                                                    rules on aviation safety. Subtitle I,
jstallworth on DSK7TPTVN1PROD with PROPOSALS




                                                                                                                     Regulatory Findings                                        (3) Will not affect intrastate aviation
                                                    Section 106, describes the authority of
                                                    the FAA Administrator. Subtitle VII,                                                                                      in Alaska, and
                                                                                                                       We have determined that this
                                                    Aviation Programs, describes in more                             proposed AD would not have federalism                      (4) Will not have a significant
                                                    detail the scope of the Agency’s                                 implications under Executive Order                       economic impact, positive or negative,
                                                    authority.                                                       13132. This proposed AD would not                        on a substantial number of small entities
                                                      We are issuing this rulemaking under                           have a substantial direct effect on the                  under the criteria of the Regulatory
                                                    the authority described in Subtitle VII,                         States, on the relationship between the                  Flexibility Act.
                                                    Part A, Subpart III, Section 44701,                              national Government and the States, or


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                                                                             Federal Register / Vol. 81, No. 92 / Thursday, May 12, 2016 / Proposed Rules                                                29507

                                                    List of Subjects in 14 CFR Part 39                      STA 540 bulkhead chords between stringers             action: Before further flight, repair using a
                                                                                                            S–22 and S–23; and do all applicable related          method approved in accordance with the
                                                      Air transportation, Aircraft, Aviation                investigative and corrective actions; in              procedures specified in paragraph (l) of this
                                                    safety, Incorporation by reference,                     accordance with Parts 1, 2, 3, 4, and 5 of the        AD.
                                                    Safety.                                                 Accomplishment Instructions of Boeing                   (4) The access and restoration instructions
                                                                                                            Special Attention Service Bulletin 737–53–            identified in the Accomplishment
                                                    The Proposed Amendment
                                                                                                            1294, Revision 2, dated December 9, 2015,             Instructions of Boeing Special Attention
                                                      Accordingly, under the authority                      except as required by paragraphs (i)(3) and           Service Bulletin 737–53–1294, Revision 2,
                                                    delegated to me by the Administrator,                   (i)(4) of this AD. Do all applicable related          dated December 9, 2015, are not required by
                                                    the FAA proposes to amend 14 CFR part                   investigative and corrective actions before           this AD. Operators may perform those actions
                                                    39 as follows:                                          further flight. Repeat the detailed and HFEC          in accordance with approved maintenance
                                                                                                            inspections thereafter at the intervals               procedures.
                                                    PART 39—AIRWORTHINESS                                   specified in table 1 of paragraph 1.E.,
                                                                                                            ‘‘Compliance,’’ of Boeing Special Attention           (j) Part 26 Supplemental Inspections Not
                                                    DIRECTIVES                                                                                                    Required by This AD
                                                                                                            Service Bulletin 737–53–1294, Revision 2,
                                                    ■ 1. The authority citation for part 39                 dated December 9, 2015, until the optional               Table 2 of paragraph 1.E., ‘‘Compliance,’’
                                                    continues to read as follows:                           preventive modification specified in                  of Boeing Special Attention Service Bulletin
                                                                                                            paragraph (h) of this AD is done.                     737–53–1294, Revision 2, dated December 9,
                                                        Authority: 49 U.S.C. 106(g), 40113, 44701.                                                                2015, specifies post-modification
                                                                                                            (h) Optional Preventive Modification                  airworthiness limitation inspections in
                                                    § 39.13   [Amended]                                        Accomplishing the preventive                       compliance with 14 CFR 25.571(a)(3) at the
                                                    ■ 2. The FAA amends § 39.13 by                          modification or repair, including an HFEC             modified locations, which support
                                                    removing Airworthiness Directive (AD)                   inspection for cracking of the skin and STA           compliance with 14 CFR 121.1109(c)(2) or
                                                    2013–19–04, Amendment 39–17586 (78                      540 bulkhead chords, and all applicable               129.109(b)(2). As airworthiness limitations,
                                                    FR 59801, September 30, 2013), and                      repairs, in accordance with paragraph 3.B,            these inspections are required by
                                                    adding the following new AD:                            Part 2 or Part 4 (left side), and Part 3 or Part      maintenance and operational rules. It is
                                                                                                            5 (right side), of the Accomplishment                 therefore unnecessary to mandate them in
                                                    The Boeing Company: Docket No. FAA–                     Instructions of Boeing Special Attention              this AD. Deviations from these inspections
                                                        2016–6670; Directorate Identifier 2016–             Service Bulletin 737–53–1294, Revision 2,             require FAA approval, but do not require an
                                                        NM–006–AD.                                          dated December 9, 2015, except as required            alternative method of compliance.
                                                    (a) Comments Due Date                                   by paragraph (i)(2) of this AD, terminates the
                                                                                                            inspection requirements of paragraph (g) of           (k) Credit for Previous Actions
                                                      The FAA must receive comments on this                 this AD for the side on which the                        This paragraph provides credit for the
                                                    AD action by June 27, 2016.                             modification is done.                                 actions required by paragraphs (g) and (h) of
                                                    (b) Affected ADs                                                                                              this AD, if those actions were performed
                                                                                                            (i) Exceptions to Service Bulletin                    before the effective date of this AD using
                                                      This AD replaces AD 2013–19–04,                       Specifications                                        Boeing Special Attention Service Bulletin
                                                    Amendment 39–17586 (78 FR 59801,                           (1) Where paragraph 1.E., ‘‘Compliance,’’ of       737–53–1294, dated March 31, 2011, which
                                                    September 30, 2013) (‘‘AD 2013–19–04’’).                Boeing Special Attention Service Bulletin             is not incorporated by reference in this AD;
                                                    (c) Applicability                                       737–53–1294, Revision 2, dated December 9,            or Boeing Special Attention Service Bulletin
                                                                                                            2015, specifies a compliance time ‘‘after the         737–53–1294, Revision 1, dated June 14,
                                                       This AD applies to The Boeing Company
                                                                                                            Revision 2 date of this service bulletin,’’ this      2013, which is incorporated by reference in
                                                    Model 737–600, –700, –700C, –800, and –900
                                                    series airplanes; certificated in any category;         AD requires compliance within the specified           AD 2013–19–04.
                                                    as identified in Boeing Special Attention               compliance time after the effective date of
                                                                                                            this AD.                                              (l) Alternative Methods of Compliance
                                                    Service Bulletin 737–53–1294, Revision 2,                                                                     (AMOCs)
                                                    dated December 9, 2015.                                    (2) For airplanes on which Boeing Business
                                                                                                            Jet Lower Cabin Altitude Supplemental Type               (1) The Manager, Seattle Aircraft
                                                    (d) Subject                                             Certificate (STC) ST01697SE (http://                  Certification Office (ACO), FAA, has the
                                                      Air Transport Association (ATA) of                    rgl.faa.gov/Regulatory_and_Guidance_                  authority to approve AMOCs for this AD, if
                                                    America Code 53, Fuselage.                              Library/rgstc.nsf/0/                                  requested using the procedures found in 14
                                                                                                            0812969a86af879b8625766400600105/$FILE/               CFR 39.19. In accordance with 14 CFR 39.19,
                                                    (e) Unsafe Condition                                    ST01697SE.pdf) (6,500 feet maximum cabin              send your request to your principal inspector
                                                       This AD was prompted by a report of                  altitude in lieu of 8,000 feet) has been              or local Flight Standards District Office, as
                                                    cracks found in the skin at body station                incorporated, the flight-cycle related                appropriate. If sending information directly
                                                    (STA) 540 just below the left side of stringer          compliance times for the inspection required          to the manager of the ACO, send it to the
                                                    S–22. We are issuing this AD to detect and              by paragraph (g) of this AD are different from        attention of the person identified in
                                                    correct fatigue cracking in the fuselage skin           those specified in paragraph 1.E.,                    paragraph (m) of this AD. Information may be
                                                    around the eight fasteners securing the STA             ‘‘Compliance,’’ of Boeing Special Attention           emailed to: 9-ANM-Seattle-ACO-AMOC-
                                                    540 bulkhead chords, which can result in                Service Bulletin 737–53–1294, Revision 2,             Requests@faa.gov.
                                                    rapid decompression of the cabin.                       dated December 9, 2015. All initial                      (2) Before using any approved AMOC,
                                                                                                            compliance times specified in total flight            notify your appropriate principal inspector,
                                                    (f) Compliance                                          cycles or flight cycles must be reduced to half       or lacking a principal inspector, the manager
                                                       Comply with this AD within the                       of those specified in Boeing Special                  of the local flight standards district office/
                                                    compliance times specified, unless already              Attention Service Bulletin 737–53–1294,               certificate holding district office.
                                                    done.                                                   Revision 2, dated December 9, 2015. All                  (3) An AMOC that provides an acceptable
                                                                                                            repetitive interval compliance times                  level of safety may be used for any repair,
                                                    (g) Inspection and Corrective Action                    specified in flight cycles must be reduced to         modification, or alteration required by this
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                                                       Except as required by paragraphs (i)(1) and          one-quarter of those specified in paragraph           AD if it is approved by the Boeing
                                                    (i)(2) of this AD, at the applicable time               1.E., ‘‘Compliance,’’ of Boeing Special               Commercial Airplanes Organization
                                                    specified in table 1 of paragraph 1.E.                  Attention Service Bulletin 737–53–1294,               Designation Authorization (ODA) that has
                                                    ‘‘Compliance,’’ of Boeing Special Attention             Revision 2, dated December 9, 2015.                   been authorized by the Manager, Seattle
                                                    Service Bulletin 737–53–1294, Revision 2,                  (3) If any cracking is found during any            ACO, to make those findings. To be
                                                    dated December 9, 2015: Do detailed and                 inspection required by this AD, and Boeing            approved, the repair method, modification
                                                    high frequency eddy current (HFEC)                      Special Attention Service Bulletin 737–53–            deviation, or alteration deviation must meet
                                                    inspections for cracking of the skin in the             1294, Revision 2, dated December 9, 2015,             the certification basis of the airplane, and the
                                                    area around the eight fasteners securing the            specifies to contact Boeing for appropriate           approval must specifically refer to this AD.



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                                                    29508                    Federal Register / Vol. 81, No. 92 / Thursday, May 12, 2016 / Proposed Rules

                                                      (4) AMOCs approved previously for the                 eddy current (HFEC) inspections for                   contains this proposed AD, the
                                                    optional preventive modification installed in           cracks around the rivets at the upper                 regulatory evaluation, any comments
                                                    accordance with paragraph (h) of AD 2013–               fastener row of the skin lap splice of the            received, and other information. The
                                                    19–04, and AMOCs approved previously for                fuselage, and repairing any crack found.              street address for the Docket Office
                                                    repairs for AD 2013–19–04, are approved as
                                                    AMOCs for the corresponding provisions of
                                                                                                            Since we issued AD 2006–20–11, an                     (phone: 800–647–5527) is in the
                                                    this AD, provided that such modification or             evaluation done by the design approval                ADDRESSES section. Comments will be
                                                    repair included installation of the splice              holder (DAH) indicated that the fuselage              available in the AD docket shortly after
                                                    plate as specified in Boeing Special Attention          skin lap splice is subject to widespread              receipt.
                                                    Service Bulletin 737–53–1294, except as                 fatigue damage (WFD). This proposed                   FOR FURTHER INFORMATION CONTACT: Eric
                                                    provided by paragraph (l)(5) of this AD.                AD would no longer allow the detailed                 Schrieber, Aerospace Engineer,
                                                      (5) The time-limited repair approved as               inspections and would instead require                 Airframe Branch, ANM–120L, FAA, Los
                                                    specified in FAA Letter 120S–15–140, dated              repetitive external HFEC inspections for
                                                    June 3, 2015, is approved as an AMOC to the
                                                                                                                                                                  Angeles Aircraft Certification Office
                                                                                                            cracking of the skin lap splices of the               (ACO), 3960 Paramount Boulevard,
                                                    corresponding requirements of this AD.
                                                                                                            fuselage, and repair if necessary. We are             Lakewood, CA 90712–4137; phone:
                                                    (m) Related Information                                 proposing this AD to detect and correct               562–627–5348; fax: 562–627–5210;
                                                       (1) For more information about this AD,              fatigue cracking at certain skin lap                  email: eric.schrieber@faa.gov.
                                                    contact Alan Pohl, Aerospace Engineer,                  splice locations of the fuselage, which               SUPPLEMENTARY INFORMATION:
                                                    Airframe Branch, ANM–120S, FAA, Seattle                 could result in reduced structural
                                                    Aircraft Certification Office, 1601 Lind                integrity and rapid decompression of                  Comments Invited
                                                    Avenue SW., Renton, WA 98057–3356;                      the airplane.
                                                    phone: 425–917–6450; fax: 425–917–6590;                                                                         We invite you to send any written
                                                    email: alan.pohl@faa.gov.                               DATES: We must receive comments on                    relevant data, views, or arguments about
                                                       (2) For service information identified in            this proposed AD by June 27, 2016.                    this proposed AD. Send your comments
                                                    this AD, contact Boeing Commercial                      ADDRESSES: You may send comments,                     to an address listed under the
                                                    Airplanes, Attention: Data & Services                   using the procedures found in 14 CFR                  ADDRESSES section. Include ‘‘Docket No.
                                                    Management, P.O. Box 3707, MC 2H–65,                    11.43 and 11.45, by any of the following              FAA–2016–6669; Directorate Identifier
                                                    Seattle, WA 98124–2207; telephone 206–                  methods:                                              2015–NM–191–AD’’ at the beginning of
                                                    544–5000, extension 1; fax 206–766–5680;
                                                                                                              • Federal eRulemaking Portal: Go to                 your comments. We specifically invite
                                                    Internet https://www.myboeingfleet.com. You
                                                    may view this referenced service information            http://www.regulations.gov. Follow the                comments on the overall regulatory,
                                                    at the FAA, Transport Airplane Directorate,             instructions for submitting comments.                 economic, environmental, and energy
                                                    1601 Lind Avenue SW., Renton, WA. You                     • Fax: 202–493–2251.                                aspects of this proposed AD. We will
                                                    may view this referenced service information               • Mail: U.S. Department of                         consider all comments received by the
                                                    at the FAA, Transport Airplane Directorate,             Transportation, Docket Operations, M–                 closing date and may amend this
                                                    1601 Lind Avenue SW., Renton, WA. For                   30, West Building Ground Floor, Room                  proposed AD because of those
                                                    information on the availability of this                 W12–140, 1200 New Jersey Avenue SE.,                  comments.
                                                    material at the FAA, call 425–227–1221.                 Washington, DC 20590.                                   We will post all comments we
                                                      Issued in Renton, Washington, on May 5,                  • Hand Delivery: Deliver to Mail                   receive, without change, to http://
                                                    2016.                                                   address above between 9 a.m. and 5                    www.regulations.gov, including any
                                                    Michael Kaszycki,                                       p.m., Monday through Friday, except                   personal information you provide. We
                                                    Acting Manager, Transport Airplane                      Federal holidays.                                     will also post a report summarizing each
                                                    Directorate, Aircraft Certification Service.               For service information identified in              substantive verbal contact we receive
                                                    [FR Doc. 2016–11167 Filed 5–11–16; 8:45 am]             this NPRM, contact Boeing Commercial                  about this proposed AD.
                                                    BILLING CODE 4910–13–P                                  Airplanes, Attention: Data & Services
                                                                                                                                                                  Discussion
                                                                                                            Management, 3855 Lakewood
                                                                                                            Boulevard, MC D800–0019, Long Beach,                     On September 22, 2006, we issued AD
                                                    DEPARTMENT OF TRANSPORTATION                            CA 90846–0001; telephone: 206–544–                    2006–20–11, Amendment 39–14781 (71
                                                                                                            5000, extension 2; fax: 206–766–5683;                 FR 58485, October 4, 2006) (‘‘AD 2006–
                                                    Federal Aviation Administration                         Internet https://                                     20–11’’), for certain The Boeing
                                                                                                            www.myboeingfleet.com. You may view                   Company Model 757–200, –200CB, and
                                                    14 CFR Part 39                                          this referenced service information at                –200PF series airplanes. AD 2006–20–
                                                    [Docket No. FAA–2016–6669; Directorate                  the FAA, Transport Airplane                           11 requires initial and repetitive
                                                    Identifier 2015–NM–191–AD]                              Directorate, 1601 Lind Avenue SW.,                    detailed or HFEC inspections for cracks
                                                                                                            Renton, WA. For information on the                    around the rivets at the upper fastener
                                                    RIN 2120–AA64                                           availability of this material at the FAA,             row of the skin lap splice of the
                                                                                                            call 425–227–1221. It is also available               fuselage, and repairing any crack found.
                                                    Airworthiness Directives; The Boeing
                                                                                                            on the Internet at http://                            AD 2006–20–11 resulted from reports of
                                                    Company Airplanes
                                                                                                            www.regulations.gov by searching for                  cracking in the fuselage skin of the
                                                    AGENCY: Federal Aviation                                and locating Docket No. FAA–2016–                     crown skin panel. We issued AD 2006–
                                                    Administration (FAA), DOT.                              6669.                                                 20–11 to detect and correct premature
                                                    ACTION: Notice of proposed rulemaking                                                                         fatigue cracking at certain skin lap
                                                                                                            Examining the AD Docket                               splice locations of the fuselage, and
jstallworth on DSK7TPTVN1PROD with PROPOSALS




                                                    (NPRM).
                                                                                                              You may examine the AD docket on                    consequent rapid decompression of the
                                                    SUMMARY:   We propose to supersede                      the Internet at http://                               airplane.
                                                    Airworthiness Directive (AD) 2006–20–                   www.regulations.gov by searching for                     Structural fatigue damage is
                                                    11, which applies to certain The Boeing                 and locating Docket No. FAA–2016–                     progressive. It begins as minute cracks,
                                                    Company Model 757–200, –200CB, and                      6669; or in person at the Docket                      and those cracks grow under the action
                                                    –200PF series airplanes. AD 2006–20–                    Management Facility between 9 a.m.                    of repeated stresses. This can happen
                                                    11 currently requires initial and                       and 5 p.m., Monday through Friday,                    because of normal operational
                                                    repetitive detailed or high frequency                   except Federal holidays. The AD docket                conditions and design attributes, or


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Document Created: 2016-05-12 01:07:33
Document Modified: 2016-05-12 01:07:33
CategoryRegulatory Information
CollectionFederal Register
sudoc ClassAE 2.7:
GS 4.107:
AE 2.106:
PublisherOffice of the Federal Register, National Archives and Records Administration
SectionProposed Rules
ActionNotice of proposed rulemaking (NPRM).
DatesWe must receive comments on this proposed AD by June 27, 2016.
ContactAlan Pohl, Aerospace Engineer, Airframe Branch, ANM-120S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue SW., Renton, WA 98057-3356; phone: 425-917-6450; fax: 425-917-6590; email: [email protected]
FR Citation81 FR 29505 
RIN Number2120-AA64
CFR AssociatedAir Transportation; Aircraft; Aviation Safety; Incorporation by Reference and Safety

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