Proposed Rule2024-31348
Airworthiness Directives; The Boeing Company Airplanes
Primary source
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Published
December 31, 2024
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA proposes to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 737-8, 737-9, and 737-8200 airplanes. This proposed AD was prompted by a report indicating that certain clip-on nuts with primer, in lieu of clip-on nuts with cadmium surface finish only (without primer), were inadvertently used to install the self-bonded saddle clamps, which support the fuel tank system tubing inside the left main, center, and right main fuel tanks. This proposed AD would require a general visual inspection (GVI) to identify affected parts, and applicable on-condition actions. The FAA is proposing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 89 Issue 250 (Tuesday, December 31, 2024)</title>
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[Federal Register Volume 89, Number 250 (Tuesday, December 31, 2024)]
[Proposed Rules]
[Pages 107067-107069]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2024-31348]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2024-2716; Project Identifier AD-2024-00262-T]
RIN 2120-AA64
Airworthiness Directives; The Boeing Company Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
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SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD)
for certain The Boeing Company Model 737-8, 737-9, and 737-8200
airplanes. This proposed AD was prompted by a report indicating that
certain clip-on nuts with primer, in lieu of clip-on nuts with cadmium
surface finish only (without primer), were inadvertently used to
install the self-bonded saddle clamps, which support the fuel tank
system tubing inside the left main, center, and right main fuel tanks.
This proposed AD would require a general visual inspection (GVI) to
identify affected parts, and applicable on-condition actions. The FAA
is proposing this AD to address the unsafe condition on these products.
DATES: The FAA must receive comments on this proposed AD by February
14, 2025.
ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
<bullet> Federal eRulemaking Portal: Go to <a href="http://regulations.gov">regulations.gov</a>. Follow
the instructions for submitting comments.
<bullet> Fax: 202-493-2251.
<bullet> 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.
<bullet> Hand Delivery: Deliver to Mail address above between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
AD Docket: You may examine the AD docket at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2024-2716; 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 NPRM, any comments received, and other
information. The street address for Docket Operations is listed above.
Material Incorporated by Reference:
<bullet> For the Boeing material identified in this proposed AD,
contact Boeing Commercial Airplanes, Attention: Contractual & Data
Services (C&DS), 2600 Westminster Blvd., 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-2024-2716.
FOR FURTHER INFORMATION CONTACT: James Laubaugh, Aviation Safety
Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 206-
231-3622; email: <a href="/cdn-cgi/l/email-protection#482229252d3b6624293d2a293d2f20082e2929662f273e"><span class="__cf_email__" data-cfemail="cba1aaa6aeb8e5a7aabea9aabeaca38badaaaae5aca4bd">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION:
Comments Invited
The FAA invites you to send any written relevant data, views, or
arguments about this proposal. Send your comments to an address listed
under the ADDRESSES section. Include ``Docket No. FAA-2024-2716;
Project Identifier AD-2024-00262-T'' at the beginning of your comments.
The most helpful comments reference a specific portion of the proposal,
explain the reason for any recommended change, and include supporting
data. The FAA will consider all comments received by the closing date
and may amend this proposal because of those comments.
Except for Confidential Business Information (CBI) as described in
the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to
<a href="http://regulations.gov">regulations.gov</a>, including any personal information you provide. The
agency will also post a report summarizing each substantive verbal
contact received about this NPRM.
Confidential Business Information
CBI is commercial or financial information that is both customarily
and actually treated as private by its owner. Under the Freedom of
Information Act (FOIA) (5 U.S.C. 552), CBI is exempt from public
disclosure. If your comments responsive to this NPRM contain commercial
or financial information that is customarily treated as private, that
you actually treat as private, and that is relevant or responsive to
this NPRM, it is important that you clearly designate the submitted
comments as CBI. Please mark each page of your submission containing
CBI as ``PROPIN.'' The FAA will treat such marked submissions as
confidential under the FOIA, and they will not be placed in the public
docket of this NPRM. Submissions containing CBI should be sent to James
Laubaugh, Aviation Safety Engineer, FAA, 2200 South 216th St., Des
Moines, WA 98198; phone: 206-231-3622; email: <a href="/cdn-cgi/l/email-protection#80eae1ede5f3aeece1f5e2e1f5e7e8c0e6e1e1aee7eff6"><span class="__cf_email__" data-cfemail="99f3f8f4fceab7f5f8ecfbf8ecfef1d9fff8f8b7fef6ef">[email protected]</span></a>.
Any commentary that the FAA receives that is not specifically
designated as CBI will be placed in the public docket for this
rulemaking.
Background
The FAA has received a report indicating that certain clip-on nuts
with primer, in lieu of clip-on nuts with cadmium surface finish only
(without primer), were inadvertently used to install the self-bonded
saddle clamps, which support the fuel tank system tubing inside the
left main, center, and right main fuel tanks. The self-bonded saddle
clamps are designed to be attached to the structure with clip-on nuts
with cadmium surface finish only (without primer). The cadmium plating
is an electrically conductive finish and bonds the fuel tank system
tubing to the structure. Each self-bonded saddle clamp has two
independent and redundant bond paths from the fuel system tubing to the
structure. These bond paths are necessary for the dissipation of
conducted lightning current, induced lightning current, and
electrostatic energy. The clip-on nuts with non-conductive primer can
interrupt or reduce the capability of the electrical bond. This
condition, if not addressed, could disperse lightning and electrostatic
energy to the structure, creating a possible ignition source inside a
fuel tank and subsequent fuel tank explosion.
FAA's Determination
The FAA is issuing this NPRM after determining that the unsafe
condition described previously is likely to exist or develop on other
products of the same type design.
Material Incorporated by Reference Under 1 CFR Part 51
The FAA reviewed Boeing Special Attention Requirements Bulletin
737-28-1376 RB, dated May 3, 2024. This material specifies procedures
for a general visual inspection (GVI) of the self-bonded saddle clamps
installed with clip-on nuts to determine whether the surface finish is
primer or cadmium surface finish only (no primer) in the left main,
center, and right main fuel tanks, and applicable on-condition actions.
The on-condition actions include replacing any clip-on nut with primer
with a clip-on nut that has
[[Page 107068]]
cadmium surface finish only (no primer). 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.
Proposed AD Requirements in This NPRM
This proposed AD would require accomplishing the actions specified
in the material already described, except for any differences
identified as exceptions in the regulatory text of this proposed AD.
This proposed AD would also prohibit the installation of affected
parts. For information on the procedures and compliance times, see this
material at <a href="http://regulations.gov">regulations.gov</a> under Docket No. FAA-2024-2716.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would
affect 393 airplanes of U.S. registry. The FAA estimates the following
costs to comply with this proposed AD:
Estimated Costs
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Cost on
Action Labor cost Parts cost Cost per U.S.
product operators
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GVI......... 31 work-hours x $0 $2,635 $1,035,555
$85 per hour =
$2,635.
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The FAA estimates the following costs to do any replacements that
would be required based on the results of the proposed inspection. The
agency has no way of determining the number of aircraft that might need
this replacement:
On-Condition Costs
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Cost per
Action Labor cost Parts cost product
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Replace clip-on nuts............................ 42 work-hours x $85 per hour = $692 $4,262
$3,570.
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The FAA has included all known costs in its cost estimate.
According to the manufacturer, however, some or all of the costs of
this proposed AD may be covered under warranty, thereby reducing the
cost impact on affected operators.
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
The FAA 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 this proposed
regulation:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Would not affect intrastate aviation in Alaska, and
(3) Would 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 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 adding the following new airworthiness
directive:
The Boeing Company: Docket No. FAA-2024-2716; Project Identifier
AD-2024-00262-T.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by February 14, 2025.
(b) Affected ADs
None.
(c) Applicability
This AD applies to The Boeing Company Model 737-8, 737-9, and
737-8200 airplanes, certificated in any category, as identified in
Boeing Special Attention Requirements Bulletin 737-28-1376 RB, dated
May 3, 2024.
(d) Subject
Air Transport Association (ATA) of America Code 28, Fuel.
(e) Unsafe Condition
This AD was prompted by a report indicating that certain clip-on
nuts with primer, in lieu of the clip-on nuts with cadmium surface
finish only (without primer), were inadvertently used to install the
self-bonded saddle clamps, which support the fuel tank system tubing
inside the left main, center, and right main fuel tanks. The FAA is
issuing this AD to address clip-on nuts with the non-conductive
primer that can interrupt or reduce the capability of the electrical
bond. The unsafe condition, if
[[Page 107069]]
not addressed, could disperse lightning and electrostatic energy to
the structure, creating a possible ignition source inside a fuel
tank and subsequent fuel tank explosion.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Required Actions
Except as specified by paragraph (h) of this AD: At the
applicable times specified in the ``Compliance'' paragraph of Boeing
Special Attention Requirements Bulletin 737-28-1376 RB, dated May 3,
2024, do all applicable actions identified in, and in accordance
with, the Accomplishment Instructions of Boeing Special Attention
Requirements Bulletin 737-28-1376 RB, dated May 3, 2024.
Note 1 to paragraph (g): Guidance for accomplishing the actions
required by this AD can be found in Boeing Special Attention Service
Bulletin 737-28-1376, dated May 3, 2024, which is referred to in
Boeing Special Attention Requirements Bulletin 737-28-1376 RB, dated
May 3, 2024.
(h) Exceptions to Requirements Bulletin Specifications
Where the Compliance Time columns of the tables in the
``Compliance'' paragraph of Boeing Special Attention Requirements
Bulletin 737-28-1376 RB, dated May 3, 2024, refer to the original
issue date of Requirements Bulletin 737-28-1376 RB, this AD requires
using the effective date of this AD.
(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#17565a58545771767639707861"><span class="__cf_email__" data-cfemail="e4a5a9aba7a4828585ca838b92">[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 James Laubaugh,
Aviation Safety Engineer, FAA, 2200 South 216th St., Des Moines, WA
98198; phone: 206-231-3622; email: <a href="/cdn-cgi/l/email-protection#dfb5beb2baacf1b3beaabdbeaab8b79fb9bebef1b8b0a9"><span class="__cf_email__" data-cfemail="355f545850461b595440575440525d755354541b525a43">[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 Special Attention Requirements Bulletin 737-28-1376
RB, dated May 3, 2024.
(ii) [Reserved]
(3) For the material identified in this AD, contact Boeing
Commercial Airplanes, Attention: Contractual & Data Services (C&DS),
2600 Westminster Blvd., 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 St.,
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 email <a href="/cdn-cgi/l/email-protection#462034682f2835362325322f2928062827342768212930"><span class="__cf_email__" data-cfemail="e18793cf888f9291848295888e8fa18f809380cf868e97">[email protected]</span></a>.
Issued on December 20, 2024.
Suzanne Masterson,
Deputy Director, Integrated Certificate Management Division, Aircraft
Certification Service.
[FR Doc. 2024-31348 Filed 12-30-24; 8:45 am]
BILLING CODE 4910-13-P
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