81 FR 59830 - Airworthiness Directives; The Boeing Company Airplanes

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration

Federal Register Volume 81, Issue 169 (August 31, 2016)

Page Range		59830-59834
FR Document		2016-20686
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. This AD was prompted by reports of heavy corrosion and chrome damage on the forward and aft trunnion pin assemblies of the right and left main landing gears (MLGs). This AD requires repetitive lubrication of the forward and aft trunnion pin assemblies of the right and left MLGs; repetitive inspections of these assemblies for corrosion and chrome damage, and related investigative and corrective actions if necessary; and installation of new or modified trunnion pin assembly components, which will terminate the repetitive lubrication and repetitive inspections. We are issuing this AD to detect and correct heavy corrosion and chrome damage on the forward and aft trunnion pin assemblies of the right and left MLGs, which could result in cracking of these assemblies and collapse of the MLGs.
Federal Register, Volume 81 Issue 169 (Wednesday, August 31, 2016)
[Federal Register Volume 81, Number 169 (Wednesday, August 31, 2016)]
[Rules and Regulations]
[Pages 59830-59834]
From the Federal Register Online  [www.thefederalregister.org]
[FR Doc No: 2016-20686]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2015-8133; Directorate Identifier 2015-NM-101-AD; 
Amendment 39-18631; AD 2016-18-01]
RIN 2120-AA64


Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: We are adopting a new airworthiness directive (AD) for certain 
The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER 
series airplanes. This AD was prompted by reports of heavy corrosion 
and chrome damage on the forward and aft trunnion pin assemblies of the 
right and left main landing gears (MLGs). This AD requires repetitive 
lubrication of the forward and aft trunnion pin assemblies of the right 
and left MLGs; repetitive inspections of these assemblies for corrosion 
and chrome damage, and related investigative and corrective actions if 
necessary; and installation of new or modified trunnion pin assembly 
components, which will terminate the repetitive lubrication and 
repetitive inspections. We are issuing this AD to detect and correct 
heavy corrosion and chrome damage on the forward and aft trunnion pin 
assemblies of the right and left MLGs, which could result in cracking 
of these assemblies and collapse of the MLGs.

DATES: This AD is effective October 5, 2016.
    The Director of the Federal Register approved the incorporation by 
reference of a certain publication listed in this AD as of October 5, 
2016.

[[Page 59831]]


ADDRESSES: For service information identified in this final rule, 
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-2015-
8133.

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-2015-
8133; 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: 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:

Discussion

    We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR 
part 39 by adding an AD that would apply to certain The Boeing Company 
Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. 
The NPRM published in the Federal Register on December 31, 2015 (80 FR 
81795) (``the NPRM''). The NPRM was prompted by reports of heavy 
corrosion and chrome damage on the forward and aft trunnion pin 
assemblies of the right and left MLGs. The NPRM proposed to require 
repetitive lubrication of the forward and aft trunnion pin assemblies 
of the right and left MLGs; repetitive inspections of these assemblies 
for corrosion and chrome damage, and related investigative and 
corrective actions if necessary; and installation of new or modified 
trunnion pin assembly components, which would terminate the repetitive 
lubrication and repetitive inspections. We are issuing this AD to 
detect and correct heavy corrosion and chrome damage on the forward and 
aft trunnion pin assemblies of the right and left MLGs, which could 
result in cracking of these assemblies and collapse of the MLGs.

Comments

    We gave the public the opportunity to participate in developing 
this AD. The following presents the comments received on the NPRM and 
the FAA's response to each comment.

Support for the NPRM

    Boeing stated that it concurs with the contents of the NPRM.

Effect of Winglets on Accomplishment of the Proposed Actions

    Aviation Partners Boeing stated that accomplishing Supplemental 
Type Certificate (STC) ST00830SE does not affect the accomplishment of 
the actions specified in the NPRM.
    We concur with the commenter. We have redesignated paragraph (c) of 
the proposed AD as paragraph (c)(1) and added new paragraph (c)(2) in 
this AD to state that installation of STC ST00830SE does not affect the 
ability to accomplish the actions required by this final rule. 
Therefore, for airplanes on which STC ST00830SE is installed, a 
``change in product'' alternative method of compliance (AMOC) approval 
request is not necessary to comply with the requirements of 14 CFR 
39.17.

Request for Clarification of Requirements

    Delta Airlines (DAL) requested an explanation of how the 
requirements are different between AD 2014-08-11, Amendment 39-17835 
(79 FR 23903, April 29, 2014) (``AD 2014-08-11'') and the NPRM. DAL 
noted that the requirements of AD 2014-08-11 include an inspection for 
discrepancies of the transition radius of the MLG forward trunnion 
pins, and corrective actions if necessary. DAL elaborated that this 
inspection is for finish damage (scrapes through primer), signs of 
corrosion, pitting, and scratches in the base metal of that area. DAL 
pointed out that the NPRM requires a general visual inspection of the 
MLG forward trunnion pin assembly for signs of corrosion or chrome 
plating damage, and if either condition is found, a detailed inspection 
of the forward trunnion pin assembly is required. DAL mentioned that 
the detailed inspection requires verification that a new seal and 
retainer configuration is installed, and if the overhaul limits exceed 
what is specified in the component maintenance manual, replacement of 
the forward trunnion pin assembly is necessary. DAL reasoned that the 
forward trunnion pin inspections required by AD 2014-08-11 should be 
superseded by the proposed forward trunnion pin inspections in the 
NPRM. DAL stated that the detailed inspection proposed in the NPRM has 
additional corrective actions if any loose or missing chrome plating is 
found, beyond what is required in AD 2014-08-11. DAL also conveyed that 
the inspections for signs of corrosion are the same in the NPRM and AD 
2014-08-11.
    We agree to provide clarification regarding how the requirements 
are different between the requirements in the proposed AD and the 
requirements mandated by AD 2014-08-11. The applicability of the 
proposed AD includes certain The Boeing Company Model 737-600, -700, -
700C, -800, -900, and -900ER series airplanes, line numbers 1 through 
3526 inclusive. The applicability of AD 2014-08-11 includes certain The 
Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER 
series airplanes, line numbers 1423 through 3526 inclusive. Although 
certain airplane line numbers are included in the applicability of both 
the proposed AD and AD 2014-08-11, the issues addressed by the NPRM and 
AD 2014-08-11 are not the same. Furthermore, the inspection 
instructions in the service information required for accomplishing the 
actions in the proposed AD are different from the inspection 
instructions in the service information required by AD 2014-08-11. The 
inspections in the proposed AD focus on chrome damage and corrosion on 
the shank of the forward trunnion pins, and the inspections required by 
AD 2014-08-11 focus on finish scratches and corrosion in the transition 
radius of the forward trunnion pins. We have not changed this AD 
regarding this issue.
    In addition, we note that the service information required to do 
the actions required by AD 2014-08-11 (which cites Boeing Special 
Attention Service Bulletin 737-32-1402, Revision 1, dated February 7, 
2013), includes a recommendation by Boeing that operators accomplish 
the specified actions concurrently with the actions specified in Boeing 
Special Attention Service Bulletin 737-32-1448 (Boeing Special 
Attention Service Bulletin 737-32-1448, Revision 1, dated May 29, 2015, 
is the appropriate source of service information for accomplishing the 
actions required by this AD).

[[Page 59832]]

Likewise, Boeing Special Attention Service Bulletin 737-32-1448, 
Revision 1, dated May 29, 2015, includes a recommendation by Boeing 
that operators accomplish the specified actions concurrently with the 
actions specified in Boeing Special Attention Service Bulletin 737-32-
1402.

Request for Clarification of Lube Fittings Location

    DAL requested clarification regarding the location of the lube 
fittings for the forward and aft MLG trunnion pin assemblies in 
paragraph (g) of the NPRM. DAL commented that the NPRM stated to do the 
repetitive lubrication in accordance with Work Package 1 of the 
Accomplishment Instructions of Boeing Special Attention Service 
Bulletin 737-32-1448, Revision 1, dated May 29, 2015. DAL noted that 
Work Package 1 of the Accomplishment Instructions of Boeing Special 
Attention Service Bulletin 737-32-1448, Revision 1, dated May 29, 2015, 
refers to section 12-21-11 of the Boeing 737-600/700/800/900 Aircraft 
Maintenance Manual (AMM) as an accepted procedure for the repetitive 
lubrication of the MLG trunnion pin assemblies. DAL stated that section 
12-21-11 of the AMM specifically identifies the locations of the 
trunnion bearing housing and the aft trunnion bearing, but does not 
specifically identify the locations of the two lube fittings for the 
forward and aft trunnion pins.
    We agree with the commenter that the two lube fittings for the 
forward and aft trunnion pins are not specifically mentioned in section 
12-21-11 of the Boeing 737-600/700/800/900 AMM. These locations are 
identified as Item [6], ``Outer Cylinder,'' on page 307 of the AMM. 
However, there are only three lube fittings associated with Item [6], 
so it is possible to determine which two fittings are to be used for 
lubricating the forward and aft trunnion pins. We consulted with Boeing 
and confirmed that the two lube fittings are located on the bottom of 
the outer cylinder trunnion, directly under the pins. We have not 
changed this AD regarding this issue.

Request for Clarification of Corrective Actions in Paragraph (h) of the 
Proposed AD

    DAL requested clarification of certain corrective actions in 
paragraph (h) of the proposed AD. DAL asked if an operator can replace 
an affected trunnion pin assembly instead of overhauling it. DAL 
pointed out that neither the NPRM nor Boeing Special Attention Service 
Bulletin 737-32-1448, Revision 1, dated May 29, 2015, specify the part 
number of the replacement trunnion pin assembly. DAL asked if an 
operator can replace an affected pin assembly with any properly 
approved pin assembly using the Boeing 737 Aircraft Illustrated Parts 
Catalog, Boeing Drawing 161A0002, ``Boeing Model 737-NG Main Landing 
Gear Component Interchangeability List,'' or a similar document.
    We agree with the commenter's request for clarification. Operators 
may elect to replace a trunnion pin assembly with a serviceable unit in 
lieu of performing an overhaul. However, operators should be aware that 
some of the existing trunnion pin assemblies require modification. 
Figures 9, 11, and 12 of Boeing Special Attention Service Bulletin 737-
32-1448, Revision 1, dated May 29, 2015, provide instructions for 
modifying certain pin assemblies. Note (c) in each of these figures 
refers to paragraph 2.C.3., ``Parts Modified and Reidentified,'' of 
Boeing Special Attention Service Bulletin 737-32-1448, Revision 1, 
dated May 29, 2015, which shows the existing and modified part numbers. 
For use of other part numbers, such as those identified in the Boeing 
737 Aircraft Illustrated Parts Catalog or Boeing Drawing 161A0002, 
``Boeing Model 737-NG Main Landing Gear Component Interchangeability 
List,'' operators may request an alternative method of compliance in 
accordance with the procedures specified in paragraph (m) of this AD. 
We have not changed this AD regarding this issue.

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 for correcting the unsafe condition; and
     Do not add any additional burden upon the public than was 
already proposed in the NPRM.
    We also determined that these changes will not increase the 
economic burden on any operator or increase the scope of this AD.

Related Service Information Under 1 CFR Part 51

    We reviewed Boeing Special Attention Service Bulletin 737-32-1448, 
Revision 1, dated May 29, 2015. The service information describes 
procedures for lubricating the forward and aft trunnion pin assemblies 
on the left and right MLGs, inspecting the forward and aft trunnion pin 
assemblies for corrosion or damage, and performing corrective actions. 
In addition, the service information describes procedures for 
installing a new forward trunnion pin housing assembly, seal, and 
retainer configuration. 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.

Costs of Compliance

    We estimate that this AD affects 1,023 airplanes of U.S. registry.
    We estimate the following costs to comply with this AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                              Cost per          Cost on U.S.
              Action                      Labor cost         Parts cost        product           operators
----------------------------------------------------------------------------------------------------------------
Lubrication.......................  2 work-hours x $85                 $0            $170  $173,910, per
                                     per hour = $170, per                                   lubrication cycle
                                     lubrication cycle.                                     (1,023 airplanes).
Inspection (Groups 1 and 2,         51 work-hours x $85                 0           4,335  4,282,980, per
 Configuration 1 airplanes).         per hour = $4,335,                                     inspection cycle
                                     per inspection cycle.                                  (988 airplanes).
Inspection (Group 3 airplanes)....  93 work-hours x $85                 0           7,905  276,675, per
                                     per hour = $7,905,                                     inspection cycle (35
                                     per inspection cycle.                                  airplanes).
Replacement/overhaul (Groups 1 and  84 work-hours x $85                 0           7,140  7,054,320 (988
 2 airplanes).                       per hour = $7,140.                                     airplanes).
Replacement/overhaul (Group 3       86 work-hours x $85                 0           7,310  255,850 (35
 airplanes).                         per hour = $7,310.                                     airplanes).
----------------------------------------------------------------------------------------------------------------


[[Page 59833]]

    We have received no definitive data that would enable us to provide 
cost estimates 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

    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:

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


Sec.  39.13  [Amended]

0
2. The FAA amends Sec.  39.13 by adding the following new airworthiness 
directive (AD):

2016-18-01 The Boeing Company: Amendment 39-18631; Docket No. FAA-
2015-8133; Directorate Identifier 2015-NM-101-AD.

(a) Effective Date

    This AD is effective October 5, 2016.

(b) Affected ADs

    None.

(c) Applicability

    (1) This AD applies to certain The Boeing Company Model 737-600, 
-700, -700C, -800, -900, and -900ER series airplanes, certificated 
in any category, as identified in Boeing Special Attention Service 
Bulletin 737-32-1448, Revision 1, dated May 29, 2015.
    (2) Installation of Supplemental Type Certificate (STC) 
ST00830SE (http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/184DE9A71EC3FA5586257EAE00707DA6?OpenDocument&Highlight=st00830se) 
does not affect the ability to accomplish the actions required by 
this AD. Therefore, for airplanes on which STC ST00830SE is 
installed, a ``change in product'' alternative method of compliance 
(AMOC) approval request is not necessary to comply with the 
requirements of 14 CFR 39.17.

(d) Subject

    Air Transport Association (ATA) of America Code 32, Landing 
Gear.

(e) Unsafe Condition

    This AD was prompted by reports of heavy corrosion and chrome 
damage of the forward and aft trunnion pin assemblies of the right 
and left main landing gears (MLGs). We are issuing this AD to detect 
and correct heavy corrosion and chrome damage of the forward and aft 
trunnion pin assemblies of the right and left MLGs, which could 
result in cracking of these assemblies and collapse of the MLGs.

(f) Compliance

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

(g) Repetitive Lubrication of MLG Trunnion Pin Assemblies

    For airplanes in Groups 1 and 2, Configuration 1, and airplanes 
in Group 3, as identified in Boeing Special Attention Service 
Bulletin 737-32-1448, Revision 1, dated May 29, 2015: Except as 
required by paragraph (k) of this AD, at the applicable time 
specified in Table 1 or Table 2 of paragraph 1.E., ``Compliance,'' 
of Boeing Special Attention Service Bulletin 737-32-1448, Revision 
1, dated May 29, 2015, lubricate the forward and aft trunnion pin 
assemblies of the left and right MLGs, in accordance with Work 
Package 1 of the Accomplishment Instructions of Boeing Special 
Attention Service Bulletin 737-32-1448, Revision 1, dated May 29, 
2015. Repeat the lubrication thereafter at intervals not to exceed 
those specified in paragraph 1.E., ``Compliance,'' of Boeing Special 
Attention Service Bulletin 737-32-1448, Revision 1, dated May 29, 
2015. Accomplishment of the actions specified in paragraph (i) of 
this AD terminates the repetitive lubrication required by this 
paragraph.

(h) Repetitive Inspections, Corrective Actions, and Lubrication

    For airplanes in Groups 1 and 2, Configuration 1, and airplanes 
in Group 3, as identified in Boeing Special Attention Service 
Bulletin 737-32-1448, Revision 1, dated May 29, 2015: Except as 
required by paragraph (k) of this AD, at the applicable time 
specified in Table 1 or Table 2 of paragraph 1.E., ``Compliance,'' 
of Boeing Special Attention Service Bulletin 737-32-1448, Revision 
1, dated May 29, 2015, do a general visual inspection of the left 
and right MLGs at the forward and aft trunnion pin locations and the 
visible surfaces of the forward and aft trunnion pin assemblies for 
signs of corrosion or chrome plating damage and lubricate the 
forward and aft trunnion pin assemblies, in accordance with Work 
Package 2 of the Accomplishment Instructions of Boeing Special 
Attention Service Bulletin 737-32-1448, Revision 1, dated May 29, 
2015. Repeat the general visual inspection thereafter at intervals 
not to exceed those specified in paragraph 1.E., ``Compliance,'' of 
Boeing Special Attention Service Bulletin 737-32-1448, Revision 1, 
dated May 29, 2015. If any discrepancy is found during any 
inspection required by this paragraph, before further flight, do all 
applicable related investigative and corrective actions in 
accordance with Work Package 2 of the Accomplishment Instructions of 
Boeing Special Attention Service Bulletin 737 32-1448, Revision 1, 
dated May 29, 2015. Accomplishment of the actions required by 
paragraph (i) of this AD terminates the repetitive inspections 
required by this paragraph.

(i) Modification of MLG Trunnion Pin Assemblies

    For airplanes in Groups 1 and 2, Configuration 1, and airplanes 
in Group 3, as identified in Boeing Special Attention Service 
Bulletin 737-32-1448, Revision 1, dated May 29, 2015: Except as 
required by paragraph (k) of this AD, at the applicable time 
specified in Table 1 or Table 2 of paragraph 1.E., ``Compliance,'' 
of Boeing Special Attention Service Bulletin 737-32-1448, Revision 
1, dated May 29, 2015, modify and lubricate the left and right MLG 
trunnion pin assemblies, and do all applicable related investigative 
and corrective actions, in accordance with Work Package 3 of the 
Accomplishment Instructions of Boeing Special Attention Service 
Bulletin 737-32-1448, Revision 1, dated May 29, 2015.

[[Page 59834]]

Accomplishment of the actions in Work Package 3 of the 
Accomplishment Instructions of Boeing Special Attention Service 
Bulletin 737-32-1448, Revision 1, dated May 29, 2015, terminates the 
repetitive lubrication required by paragraph (g) of this AD and the 
repetitive inspections required by paragraph (h) of this AD.

(j) Replacement of MLG Forward Trunnion Pin Housing Assembly, Seal, and 
Retainer

    For airplanes in Groups 1 and 2, Configuration 2, as identified 
in Boeing Special Attention Service Bulletin 737-32-1448, Revision 
1, dated May 29, 2015: At the applicable time specified in Table 3 
of paragraph 1.E., ``Compliance,'' of Boeing Special Attention 
Service Bulletin 737-32-1448, Revision 1, dated May 29, 2015, 
replace the seal, retainer, and support ring assembly with a new 
seal and retainer configuration; install the forward trunnion pin 
assembly into the housing assembly; and lubricate the forward and 
aft trunnion pin assemblies for the left and right MLGs; in 
accordance with Work Package 4 of the Accomplishment Instructions of 
Boeing Special Attention Service Bulletin 737-32-1448, Revision 1, 
dated May 29, 2015.

(k) Exception to Service Information Specification

    Where paragraph 1.E., ``Compliance,'' of Boeing Special 
Attention Service Bulletin 737-32-1448, Revision 1, dated May 29, 
2015, specifies a compliance time ``from the original issue date on 
this service bulletin,'' this AD requires compliance within the 
specified compliance time ``after the effective date of this AD.''

(l) Credit for Previous Actions

    This paragraph provides credit for the requirements of paragraph 
(g) of this AD, if those actions were performed before the effective 
date of this AD using Boeing Special Attention Service Bulletin 737-
32-1448, dated May 19, 2011, which is not incorporated by reference 
in this AD.

(m) 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 (n)(1) 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.

(n) 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) Service information identified in this AD that is not 
incorporated by reference is available at the addresses specified in 
paragraphs (o)(3) and (o)(4) of this AD.

(o) 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.
    (i) Boeing Special Attention Service Bulletin 737-32-1448, 
Revision 1, dated May 29, 2015.
    (ii) Reserved.
    (3) 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.
    (4) You may view this 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.
    (5) 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 18, 2016.
Dorr M. Anderson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2016-20686 Filed 8-30-16; 8:45 am]
 BILLING CODE 4910-13-P
59832 Federal Register / Vol. 81, No. 169 / Wednesday, August 31, 2016 / Rules and Regulations

Likewise, Boeing Special Attention the bottom of the outer cylinder alternative method of compliance in
Service Bulletin 737–32–1448, Revision trunnion, directly under the pins. We accordance with the procedures
1, dated May 29, 2015, includes a have not changed this AD regarding this specified in paragraph (m) of this AD.
recommendation by Boeing that issue. We have not changed this AD regarding
operators accomplish the specified this issue.
Request for Clarification of Corrective
actions concurrently with the actions
Actions in Paragraph (h) of the Conclusion
specified in Boeing Special Attention
Proposed AD We reviewed the relevant data,
Service Bulletin 737–32–1402.
DAL requested clarification of certain considered the comments received, and
Request for Clarification of Lube corrective actions in paragraph (h) of the determined that air safety and the
Fittings Location proposed AD. DAL asked if an operator public interest require adopting this AD
DAL requested clarification regarding can replace an affected trunnion pin with the changes described previously
the location of the lube fittings for the assembly instead of overhauling it. DAL and minor editorial changes. We have
forward and aft MLG trunnion pin pointed out that neither the NPRM nor determined that these minor changes:
assemblies in paragraph (g) of the Boeing Special Attention Service • Are consistent with the intent that
NPRM. DAL commented that the NPRM Bulletin 737–32–1448, Revision 1, dated was proposed in the NPRM for
stated to do the repetitive lubrication in May 29, 2015, specify the part number correcting the unsafe condition; and
accordance with Work Package 1 of the of the replacement trunnion pin • Do not add any additional burden
Accomplishment Instructions of Boeing assembly. DAL asked if an operator can upon the public than was already
Special Attention Service Bulletin 737– replace an affected pin assembly with proposed in the NPRM.
32–1448, Revision 1, dated May 29, any properly approved pin assembly We also determined that these
2015. DAL noted that Work Package 1 using the Boeing 737 Aircraft Illustrated changes will not increase the economic
of the Accomplishment Instructions of Parts Catalog, Boeing Drawing burden on any operator or increase the
Boeing Special Attention Service 161A0002, ‘‘Boeing Model 737–NG scope of this AD.
Bulletin 737–32–1448, Revision 1, dated Main Landing Gear Component
May 29, 2015, refers to section 12–21– Interchangeability List,’’ or a similar Related Service Information Under 1
11 of the Boeing 737–600/700/800/900 document. CFR Part 51
Aircraft Maintenance Manual (AMM) as We agree with the commenter’s We reviewed Boeing Special
an accepted procedure for the repetitive request for clarification. Operators may Attention Service Bulletin 737–32–
lubrication of the MLG trunnion pin elect to replace a trunnion pin assembly 1448, Revision 1, dated May 29, 2015.
assemblies. DAL stated that section 12– with a serviceable unit in lieu of The service information describes
21–11 of the AMM specifically performing an overhaul. However, procedures for lubricating the forward
identifies the locations of the trunnion operators should be aware that some of and aft trunnion pin assemblies on the
bearing housing and the aft trunnion the existing trunnion pin assemblies left and right MLGs, inspecting the
bearing, but does not specifically require modification. Figures 9, 11, and forward and aft trunnion pin assemblies
identify the locations of the two lube 12 of Boeing Special Attention Service for corrosion or damage, and performing
fittings for the forward and aft trunnion Bulletin 737–32–1448, Revision 1, dated corrective actions. In addition, the
pins. May 29, 2015, provide instructions for service information describes
We agree with the commenter that the modifying certain pin assemblies. Note procedures for installing a new forward
two lube fittings for the forward and aft (c) in each of these figures refers to trunnion pin housing assembly, seal,
trunnion pins are not specifically paragraph 2.C.3., ‘‘Parts Modified and and retainer configuration. This service
mentioned in section 12–21–11 of the Reidentified,’’ of Boeing Special information is reasonably available
Boeing 737–600/700/800/900 AMM. Attention Service Bulletin 737–32– because the interested parties have
These locations are identified as Item 1448, Revision 1, dated May 29, 2015, access to it through their normal course
[6], ‘‘Outer Cylinder,’’ on page 307 of which shows the existing and modified of business or by the means identified
the AMM. However, there are only three part numbers. For use of other part in the ADDRESSES section.
lube fittings associated with Item [6], so numbers, such as those identified in the
it is possible to determine which two Boeing 737 Aircraft Illustrated Parts Costs of Compliance
fittings are to be used for lubricating the Catalog or Boeing Drawing 161A0002, We estimate that this AD affects 1,023
forward and aft trunnion pins. We ‘‘Boeing Model 737–NG Main Landing airplanes of U.S. registry.
consulted with Boeing and confirmed Gear Component Interchangeability We estimate the following costs to
that the two lube fittings are located on List,’’ operators may request an comply with this AD:
ESTIMATED COSTS
Cost per
Action Labor cost Parts cost Cost on U.S. operators
product

Lubrication ...................................... 2 work-hours × $85 per hour = $0 $170 $173,910, per lubrication cycle
$170, per lubrication cycle. (1,023 airplanes).
Inspection (Groups 1 and 2, Con- 51 work-hours × $85 per hour = 0 4,335 4,282,980, per inspection cycle
figuration 1 airplanes). $4,335, per inspection cycle. (988 airplanes).
Inspection (Group 3 airplanes) ....... 93 work-hours × $85 per hour = 0 7,905 276,675, per inspection cycle (35
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$7,905, per inspection cycle. airplanes).
Replacement/overhaul (Groups 1 84 work-hours × $85 per hour = 0 7,140 7,054,320 (988 airplanes).
and 2 airplanes). $7,140.
Replacement/overhaul (Group 3 86 work-hours × $85 per hour = 0 7,310 255,850 (35 airplanes).
airplanes). $7,310.

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59834 Federal Register / Vol. 81, No. 169 / Wednesday, August 31, 2016 / Rules and Regulations

Accomplishment of the actions in Work to make those findings. To be approved, the DEPARTMENT OF TRANSPORTATION
Package 3 of the Accomplishment repair method, modification deviation, or
Instructions of Boeing Special Attention alteration deviation must meet the Federal Aviation Administration
Service Bulletin 737–32–1448, Revision 1, certification basis of the airplane, and the
dated May 29, 2015, terminates the repetitive approval must specifically refer to this AD.
lubrication required by paragraph (g) of this
14 CFR Part 39
AD and the repetitive inspections required by (n) Related Information [Docket No. FAA–2016–9047; Directorate
paragraph (h) of this AD. Identifier 2016–NM–092–AD; Amendment
(1) For more information about this AD,
(j) Replacement of MLG Forward Trunnion contact Alan Pohl, Aerospace Engineer, 39–18632; AD 2016–18–02]
Pin Housing Assembly, Seal, and Retainer Airframe Branch, ANM–120S, FAA Seattle RIN 2120–AA64
For airplanes in Groups 1 and 2, Aircraft Certification Office, 1601 Lind
Configuration 2, as identified in Boeing Avenue SW., Renton, WA 98057–3356; Airworthiness Directives; The Boeing
Special Attention Service Bulletin 737–32– phone: 425–917–6450; fax: 425–917–6590; Company Airplanes
1448, Revision 1, dated May 29, 2015: At the email: alan.pohl@faa.gov.
applicable time specified in Table 3 of (2) Service information identified in this
AGENCY: Federal Aviation
paragraph 1.E., ‘‘Compliance,’’ of Boeing AD that is not incorporated by reference is
Administration (FAA), DOT.
Special Attention Service Bulletin 737–32– ACTION: Final rule; request for
available at the addresses specified in
1448, Revision 1, dated May 29, 2015, comments.
replace the seal, retainer, and support ring paragraphs (o)(3) and (o)(4) of this AD.
assembly with a new seal and retainer (o) Material Incorporated by Reference SUMMARY: We are adopting a new
configuration; install the forward trunnion airworthiness directive (AD) for certain
pin assembly into the housing assembly; and (1) The Director of the Federal Register
lubricate the forward and aft trunnion pin approved the incorporation by reference The Boeing Company Model 777–200
assemblies for the left and right MLGs; in (IBR) of the service information listed in this and –300ER series airplanes. This AD
accordance with Work Package 4 of the paragraph under 5 U.S.C. 552(a) and 1 CFR requires replacing the low-pressure
Accomplishment Instructions of Boeing part 51. oxygen flex hoses with new non-
Special Attention Service Bulletin 737–32– (2) You must use this service information conductive low-pressure oxygen flex
1448, Revision 1, dated May 29, 2015. as applicable to do the actions required by hoses in the gaseous passenger oxygen
(k) Exception to Service Information this AD, unless the AD specifies otherwise. system in airplanes equipped with
Specification (i) Boeing Special Attention Service therapeutic oxygen. This AD was
Where paragraph 1.E., ‘‘Compliance,’’ of Bulletin 737–32–1448, Revision 1, dated May prompted by a determination that the
Boeing Special Attention Service Bulletin 29, 2015. low-pressure oxygen flex hoses in the
737–32–1448, Revision 1, dated May 29, (ii) Reserved. gaseous passenger oxygen system can
2015, specifies a compliance time ‘‘from the (3) For service information identified in potentially be conductive. We are
original issue date on this service bulletin,’’ this AD, contact Boeing Commercial issuing this AD to prevent electrical
this AD requires compliance within the Airplanes, Attention: Data & Services current from passing through the low-
specified compliance time ‘‘after the effective Management, P.O. Box 3707, MC 2H–65, pressure oxygen flex hoses in the
date of this AD.’’ Seattle, WA 98124–2207; telephone 206– gaseous passenger oxygen system,
(l) Credit for Previous Actions 544–5000, extension 1; fax 206–766–5680; which can cause the flex hoses to melt
This paragraph provides credit for the Internet https://www.myboeingfleet.com. or burn, and a consequent oxygen-fed
requirements of paragraph (g) of this AD, if (4) You may view this service information fire in the passenger cabin.
those actions were performed before the at the FAA, Transport Airplane Directorate, DATES: This AD is effective September
effective date of this AD using Boeing Special 1601 Lind Avenue SW., Renton, WA. For 15, 2016.
Attention Service Bulletin 737–32–1448, information on the availability of this
dated May 19, 2011, which is not The Director of the Federal Register
material at the FAA, call 425–227–1221.
incorporated by reference in this AD. approved the incorporation by reference
(5) You may view this service information
of a certain publication listed in this AD
(m) Alternative Methods of Compliance that is incorporated by reference at the
as of September 15, 2016].
(AMOCs) National Archives and Records
We must receive comments on this
(1) The Manager, Seattle Aircraft Administration (NARA). For information on
AD by October 17, 2016.
Certification Office (ACO), FAA, has the the availability of this material at NARA, call
authority to approve AMOCs for this AD, if 202–741–6030, or go to: http:// ADDRESSES: You may send comments,
requested using the procedures found in 14 www.archives.gov/federal-register/cfr/ibr- using the procedures found in 14 CFR
CFR 39.19. In accordance with 14 CFR 39.19, locations.html. 11.43 and 11.45, by any of the following
send your request to your principal inspector methods:
or local Flight Standards District Office, as Issued in Renton, Washington, on August • Federal eRulemaking Portal: Go to
appropriate. If sending information directly 18, 2016. http://www.regulations.gov. Follow the
to the manager of the ACO, send it to the Dorr M. Anderson, instructions for submitting comments.
attention of the person identified in Acting Manager, Transport Airplane • Fax: 202–493–2251.
paragraph (n)(1) of this AD. Information may
be emailed to: 9-ANM-Seattle-ACO-AMOC-
Directorate, Aircraft Certification Service. • Mail: U.S. Department of
Requests@faa.gov. [FR Doc. 2016–20686 Filed 8–30–16; 8:45 am] Transportation, Docket Operations, M–
(2) Before using any approved AMOC, BILLING CODE 4910–13–P 30, West Building Ground Floor, Room
notify your appropriate principal inspector, W12–140, 1200 New Jersey Avenue SE.,
or lacking a principal inspector, the manager Washington, DC 20590.
of the local flight standards district office/ • Hand Delivery: Deliver to Mail
certificate holding district office. address above between 9 a.m. and 5
ehiers on DSK5VPTVN1PROD with RULES

(3) An AMOC that provides an acceptable p.m., Monday through Friday, except
level of safety may be used for any repair,
modification, or alteration required by this
Federal holidays.
AD if it is approved by the Boeing For service information identified in
Commercial Airplanes Organization this final rule, contact Boeing
Designation Authorization (ODA) that has Commercial Airplanes, Attention: Data
been authorized by the Manager, Seattle ACO & Services Management, P.O. Box 3707,

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Document Created: 2018-02-02 12:15:02
Document Modified: 2018-02-02 12:15:02
Category		Regulatory Information
Collection		Federal Register
sudoc Class		AE 2.7: GS 4.107: AE 2.106:
Publisher		Office of the Federal Register, National Archives and Records Administration
Section		Rules and Regulations
Action		Final rule.
Dates		This AD is effective October 5, 2016.
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]
FR Citation		81 FR 59830
RIN Number		2120-AA64
CFR Associated		Air Transportation; Aircraft; Aviation Safety; Incorporation by Reference and Safety
81 FR 59830 - Airworthiness Directives; The Boeing Company Airplanes

DEPARTMENT OF TRANSPORTATIONFederal Aviation Administration

Federal Register Volume 81, Issue 169 (August 31, 2016)

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
