Rule2025-02398
Airworthiness Directives; The Boeing Company Airplanes
Primary source
Metadata and text below are from the Federal Register, a public-domain U.S. government work. Always verify the official published version before relying on it for any legal matter.
Published
February 10, 2025
Effective
March 17, 2025
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company (Boeing) Model 747-100, 747-100B, 747-100B SUD, 747- 200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SP, and 747SR series airplanes. This AD was prompted by a report of improper inner diameter grinding of landing gear outer cylinders, resulting in possible heat damage to the outer cylinder of the nose landing gear (NLG), body landing gear (BLG), and wing landing gear (WLG). This AD requires replacing any affected outer cylinders. The FAA is issuing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 90 Issue 26 (Monday, February 10, 2025)</title>
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[Federal Register Volume 90, Number 26 (Monday, February 10, 2025)]
[Rules and Regulations]
[Pages 9201-9203]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2025-02398]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2024-1690; Project Identifier AD-2024-00083-T;
Amendment 39-22938; AD 2025-02-05]
RIN 2120-AA64
Airworthiness Directives; The Boeing Company Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all
The Boeing Company (Boeing) Model 747-100, 747-100B, 747-100B SUD, 747-
200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SP,
and 747SR series airplanes. This AD was prompted by a report of
improper inner diameter grinding of landing gear outer cylinders,
resulting in possible heat damage to the outer cylinder of the nose
landing gear (NLG), body landing gear (BLG), and wing landing gear
(WLG). This AD requires replacing any affected outer cylinders. The FAA
is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective March 17, 2025.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of March 17,
2025.
ADDRESSES:
AD Docket: You may examine the AD docket at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2024-1690; or in person at Docket Operations between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD
docket contains this final rule, any comments received, and other
information. The address for Docket Operations is U.S. Department of
Transportation, Docket Operations, M-30, West Building Ground Floor,
Room W12-140, 1200 New Jersey Avenue SE, Washington, DC 20590.
Material Incorporated by Reference:
<bullet> For The Boeing Company material identified in this AD,
contact Boeing Commercial Airplanes, Attention: Contractual & Data
Services (C&DS), 2600 Westminster Boulevard, MC 110-SK57, Seal Beach,
CA 90740-5600; telephone 562-797-1717; website <a href="http://myboeingfleet.com">myboeingfleet.com</a>.
<bullet> You may view this material at the FAA, Airworthiness
Products Section, Operational Safety Branch, 2200 South 216th St., Des
Moines, WA. For information on the availability of this material at the
FAA, call 206-231-3195. It is also available at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2024-1690.
FOR FURTHER INFORMATION CONTACT: Stefanie Roesli, Aviation Safety
Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; telephone
206-231-3964; email <a href="/cdn-cgi/l/email-protection#f281869794939c9b97dc9cdc809d97819e9bb2949393dc959d84"><span class="__cf_email__" data-cfemail="4d3e39282b2c2324286323633f22283e21240d2b2c2c632a223b">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION:
Background
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to all Boeing Model 747-
100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300,
747-400, 747-400D, 747-400F, 747SP, and 747SR series airplanes. The
NPRM published in the Federal Register on June 20, 2024 (89 FR 51861).
The NPRM was prompted by a report of improper inner diameter grinding
of landing gear outer cylinders, resulting in possible heat damage to
the outer cylinder of the NLG, BLG, and WLG. In the NPRM, the FAA
proposed to require replacing any affected outer cylinders. The FAA is
issuing this AD to address the unsafe condition on these products.
Discussion of Final Airworthiness Directive
Comments
The FAA received one comment from The Air Line Pilots Association,
International (ALPA) who supported the NPRM without change.
The FAA received two additional comments from Boeing. The following
presents the comments received on the NPRM and the FAA's response to
each comment.
Request To Clarify Affected Outer Cylinder Serial Numbers
Boeing requested that an exception paragraph be added to clarify
affected outer cylinder numbers. Boeing stated Boeing Alert
Requirements Bulletin 747-32A2535 RB, dated January 22, 2024,
inadvertently lists nine serial numbers without the correct number of
leading zeros. Boeing requested that the FAA add the following language
to paragraph (h) of the proposed AD, ``Where Appendix B of Boeing Alert
Requirements Bulletin 747-32A2535 RB, Original Issue dated January 22,
2024, specifies two-digit serial numbers, add two leading zeros (e.g.,
serial number 47 should be 0047). Where Appendix B of Boeing Alert
Requirements Bulletin 747-32A2535 RB, Original Issue dated January 22,
2024, specifies three-digit serial numbers, add one leading zero (e.g.,
serial number 109 should be 0109).''
The FAA concurs with the comment. The serial numbers listed in
Appendix B of Boeing Alert Requirements Bulletin 747-32A2535 RB, dated
January 22, 2024, are part of the required action to find the parts
affected by the unsafe condition. Furthermore, the two-digit and three-
digit serial numbers listed in Appendix B of Boeing Alert Requirements
Bulletin 747-32A2535 RB, dated January 22, 2024, do not exist and the
request is for clarification only. The FAA has revised this AD
accordingly.
Request To Add a Parts Installation Prohibition
Boeing requested that a parts installation prohibition paragraph be
added to the proposed AD. Boeing stated the outer cylinders of the NLG,
BLG, and WLG are rotable structural components which may be moved from
one airplane to another. Boeing stated the applicability of the AD
covers all in-service Model 747 airplanes noted in Boeing Alert
Requirements Bulletin 747-32A2535 RB, dated January 22, 2024; however
the parts installation
[[Page 9202]]
prohibition is needed to prevent the affected outer cylinders from
being moved onto airplanes which have already complied with the
required actions of the AD.
The FAA agrees to clarify. 14 CFR 39.7 specifies that once an AD is
issued, no person may operate a product to which the AD applies except
in accordance with the requirements of that AD. Further, 14 CFR 39.9
imposes a continuing obligation to maintain compliance with an AD by
establishing a separate violation for each time an aircraft is operated
that fails to meet AD requirements. Thus, operators have an ongoing
obligation to ensure that the AD-mandated configuration is maintained.
The FAA has not changed this AD as a result of the request.
Conclusion
The FAA reviewed the relevant data, considered any comments
received, and determined that air safety requires adopting this AD as
proposed. Accordingly, the FAA is issuing this AD to address the unsafe
condition on these products. Except for minor editorial changes, and
any other changes described previously, this AD is adopted as proposed
in the NPRM. None of the changes will increase the economic burden on
any operator.
Material Incorporated by Reference Under 1 CFR Part 51
The FAA reviewed Boeing Alert Requirements Bulletin 747-32A2535 RB,
dated January 22, 2024. This material specifies procedures for
determining whether the outer cylinder of the NLG, the right and left
WLG, and the right and left BLG have an affected part number and serial
number and replacing all affected outer cylinders.
This material 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
The FAA estimates that this AD affects 168 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:
Estimated Costs
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Cost per Cost on U.S.
Action Labor cost Parts cost product operators
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Inspection or maintenance records check 3 work-hours x $85 per $0 $255 $42,840
for affected parts. hour = $255.
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The FAA estimates the following costs to do any replacements that
would be required based on the results of the inspection or maintenance
records check. The agency has no way of determining the number of
airplanes that might need this replacement:
On-Condition Costs
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Cost per
Action Labor cost Parts cost product Cost on U.S. operators
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Replacement of outer cylinder (67 161 work-hours x $85 $325,000 $338,685 $22,691,895 (67
affected parts). per hour = $13,685. affected parts).
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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.
The FAA is 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) Will not affect intrastate aviation in Alaska, and
(3) 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.
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:
2025-02-05 The Boeing Company: Amendment 39-22938; Docket No. FAA-
2024-1690; Project Identifier AD-2024-00083-T.
(a) Effective Date
This airworthiness directive (AD) is effective March 17, 2025.
[[Page 9203]]
(b) Affected ADs
None.
(c) Applicability
This AD applies to all The Boeing Company Model 747-100, 747-
100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400,
747-400D, 747-400F, 747SP, and 747SR series airplanes, certificated
in any category.
(d) Subject
Air Transport Association (ATA) of America Code 32, Landing
gear.
(e) Unsafe Condition
This AD was prompted by a report of improper inner diameter
grinding of landing gear outer cylinders, resulting in possible heat
damage to the outer cylinder of the nose landing gear (NLG), body
landing gear (BLG), and wing landing gear (WLG). The FAA is issuing
this AD to address heat damage to the outer cylinder of the NLG,
BLG, and WLG. The unsafe condition, if not addressed, could cause
failure of a principal structural element to sustain its limit load
or collapse of the landing gear, which may result in loss of control
of the airplane or a runway departure.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Required Actions
Except as specified in paragraph (h) of this AD: At the
applicable times specified in the ``Compliance'' paragraph of Boeing
Alert Requirements Bulletin 747-32A2535 RB, dated January 22, 2024,
do all applicable actions identified in, and in accordance with, the
Accomplishment Instructions of Boeing Alert Requirements Bulletin
747-32A2535 RB, dated January 22, 2024.
Note 1 to paragraph (g): Guidance for accomplishing the actions
required by this AD can be found in Boeing Alert Service Bulletin
747-32A2535, dated January 22, 2024, which is referred to in Boeing
Alert Requirements Bulletin 747-32A2535 RB, dated January 22, 2024.
(h) Exceptions to Requirements Bulletin Specifications
(1) Where the ``Boeing Recommended Compliance Time'' column in
the table under the ``Compliance'' paragraph of Boeing Alert
Requirements Bulletin 747-32A2535 RB, dated January 22, 2024, refers
to ``the Original Issue date of Requirements Bulletin 747-32A2535
RB,'' this AD requires using the effective date of this AD.
(2) Where Appendix B of Boeing Alert Requirements Bulletin 747-
32A2535 RB, dated January 22, 2024, specifies two-digit serial
numbers, add two leading zeros (e.g., serial number 47 should be
0047).
(3) Where Appendix B of Boeing Alert Requirements Bulletin 747-
32A2535 RB, dated January 22, 2024, specifies three-digit serial
numbers, add one leading zero (e.g., serial number 109 should be
0109).
(i) Alternative Methods of Compliance (AMOCs)
(1) The Manager, AIR-520, Continued Operational Safety Branch,
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
responsible Flight Standards Office, as appropriate. If sending
information directly to the manager of the certification office,
send it to the attention of the person identified in paragraph
(j)(1) of this AD. Information may be emailed to: <a href="/cdn-cgi/l/email-protection#7e3f33313d3e181f1f50191108"><span class="__cf_email__" data-cfemail="3f7e72707c7f595e5e11585049">[email protected]</span></a>.
(2) Before using any approved AMOC, notify your appropriate
principal inspector, or lacking a principal inspector, the manager
of the responsible Flight Standards 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 Company Organization Designation
Authorization (ODA) that has been authorized by the Manager, AIR-
520, Continued Operational Safety Branch, FAA, 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.
(j) Related Information
(1) For more information about this AD, contact Stefanie Roesli,
Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines,
WA 98198; telephone 206-231-3964; email <a href="/cdn-cgi/l/email-protection#7506011013141b1c105b1b5b071a1006191c351314145b121a03"><span class="__cf_email__" data-cfemail="ef9c9b8a898e81868ac181c19d808a9c8386af898e8ec1888099">[email protected]</span></a>.
(2) Material identified in this AD that is not incorporated by
reference is available at the address specified in paragraph (k)(3)
of this AD.
(k) Material Incorporated by Reference
(1) The Director of the Federal Register approved the
incorporation by reference of the material listed in this paragraph
under 5 U.S.C. 552(a) and 1 CFR part 51.
(2) You must use this material as applicable to do the actions
required by this AD, unless the AD specifies otherwise.
(i) Boeing Alert Requirements Bulletin 747-32A2535 RB, dated
January 22, 2024.
(ii) [Reserved]
(3) For The Boeing Company material identified in this AD,
contact Boeing Commercial Airplanes, Attention: Contractual & Data
Services (C&DS), 2600 Westminster Boulevard, MC 110-SK57, Seal
Beach, CA 90740-5600; telephone 562-797-1717; website
<a href="http://myboeingfleet.com">myboeingfleet.com</a>.
(4) You may view this material at the FAA, Airworthiness
Products Section, Operational Safety Branch, 2200 South 216th
Street, Des Moines, WA. For information on the availability of this
material at the FAA, call 206-231-3195.
(5) You may view this material at the National Archives and
Records Administration (NARA). For information on the availability
of this material at NARA, visit <a href="http://www.archives.gov/federal-register/cfr/ibr-locations">www.archives.gov/federal-register/cfr/ibr-locations</a> or <a href="/cdn-cgi/l/email-protection#dbbeb6bab2b7bda9f5b2b5a8abbeb8afb2b4b59bb5baa9baf5bcb4ad"><span class="__cf_email__" data-cfemail="c4a1a9a5ada8a2b6eaadaab7b4a1a7b0adabaa84aaa5b6a5eaa3abb2">[email protected]</span></a>.
Issued on January 16, 2025.
Suzanne Masterson,
Deputy Director, Integrated Certificate Management Division, Aircraft
Certification Service.
[FR Doc. 2025-02398 Filed 2-7-25; 8:45 am]
BILLING CODE 4910-13-P
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