[4910-13-P]
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2024-1693; Project Identifier AD-2023-01229-T]
RIN 2120-AA64
Airworthiness Directives; The Boeing Company Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) for certain
The Boeing Company Model 737-300, -400, and -800 series airplanes. This proposed AD
was prompted by a report that the protective spiral wrap used on certain galley wire
bundles does not have the correct flammability properties. This proposed AD would
require inspecting certain galleys to determine part numbers, inspecting for an existing
galley modification placard and marking on galleys with affected part numbers, and
replacing wire bundle spiral wrap sleeving as applicable. This proposed AD would also
prohibit the installation of affected parts. 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 [INSERT DATE 45
DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER].
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 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.
AD Docket: You may examine the AD docket at regulations.gov under Docket No. FAA2024-1693; 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:
• For Boeing service information, 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
myboeingfleet.com.
• You may view this service information 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 regulations.gov by searching for and locating Docket No. FAA-2024-1693.
FOR FURTHER INFORMATION CONTACT: Julie Linn, Aviation Safety Engineer,
FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 206-231-3584; email:
julie.linn@faa.gov.
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 ADDRESSES. Include

“Docket No. FAA-2024-1693; Project Identifier AD-2023-01229-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 regulations.gov, 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 Julie Linn, Aviation
Safety Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone and fax:
206-231-3584; email: julie.linn@faa.gov. 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 the polyethylene protective spiral
wrap used on wire bundles on some Safran (formerly Driessen) galleys does not have the

correct flammability properties. Tests found that it does not meet the vertical
flammability standard and thus may catch fire without the ability to self-extinguish. This
condition, if not addressed, could result in electrical arcing or sparking, ignition of the
spiral wire wrapping, and smoke and/or fire in the flight compartment, leading to loss of
continued safe flight and landing.
The FAA previously issued AD 2006-12-06, Amendment 39-14631 (71 FR
32811, June 7, 2006) (AD 2006-12-06) to address the identified unsafe condition on
certain The Boeing Company Model 737-300, -400, -500, -700, and -800 series airplanes;
Model 747-400 and -400F series airplanes; Model 757-200 series airplanes; Model 767300 series airplanes; and Model 777-300 series airplanes. AD 2006-12-06 requires
inspecting to determine if certain galleys and closets are installed and replacing the spiral
wire wrapping of the electrical cables of the galleys and closets with new spiral wire
wrapping if necessary. Since the FAA issued AD 2006-12-06, Boeing and the FAA
determined that certain additional airplanes and galley part numbers are also subject to
the unsafe condition, and this proposed AD is necessary to address the unsafe condition
on those additional airplanes and galley part numbers.
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.
Related Service Information under 1 CFR Part 51
The FAA reviewed Boeing Alert Requirements Bulletin 737-25A1873 RB, dated
August 25, 2023; and Boeing Alert Requirements Bulletin 737-25A1876 RB, dated
September 1, 2023. This service information specifies procedures for an inspection or
records check to determine the part number of certain galleys; and for any galley with an
affected part number found, an inspection for an existing galley modification placard and

any marking indicating the galley was modified using certain service information; and if
applicable, replacement of wire bundle polyethylene protective spiral wrap protective
sleeving with Boeing Material Specification (BMS) 13-81 wire protective sleeving.
These documents are distinct because they apply to different airplane models.
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
ADDRESSES.
Proposed AD Requirements in this NPRM
This proposed AD would require accomplishing the actions specified in the
service information 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 service information at regulations.gov under Docket No. FAA-2024-1693.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would affect 4 airplanes
of U.S. registry. The FAA estimates the following costs to comply with this proposed
AD:
Estimated costs
Action

Labor cost

Parts cost

Cost per
product

Cost on U.S.
operators

Inspection for
galley part
number

1 work-hour X $85 per
hour = $85

$0

$85

$340

The FAA estimates the following costs to do any necessary inspections or
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 these
inspections or replacements:

On-condition costs
Action

Labor cost

Parts cost

Cost per product

Inspection for
modification placard

1 work-hour X $85 per hour =
$85

$0

$85

Replacement

Up to 218 work-hours X $85
per hour = $18,530

Up to
$1,185

Up to $19,715

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
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
§ 39.13 [Amended]
2. The FAA amends § 39.13 by adding the following new airworthiness directive:
The Boeing Company: Docket No. FAA-2024-1693; Project Identifier AD-2023-01229T.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive (AD) by
[INSERT DATE 45 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL
REGISTER].
(b) Affected ADs
None.
(c) Applicability
This AD applies to The Boeing Company Model 737-300, -400, and -800 series
airplanes, certificated in any category, as identified in Boeing Alert Requirements
Bulletin 737-25A1873 RB, dated August 25, 2023; or Boeing Alert Requirements
Bulletin 737-25A1876 RB, dated September 1, 2023; as applicable.

(d) Subject
Air Transport Association (ATA) of America Code 25, Equipment/furnishings.
(e) Unsafe Condition
This AD was prompted by a report that the protective spiral wrap used on certain
galley wire bundles does not have the correct flammability properties and may not selfextinguish. The unsafe condition, if not addressed, could result in electrical arcing or
sparking, ignition of the spiral wire wrapping, and smoke and/or fire in the flight
compartment, leading to loss of continued safe flight and landing.
(f) Compliance
Comply with this AD within the compliance times specified, unless already done.
(g) Required Actions
(1) For Model 737-300 and -400 series airplanes: Except as specified by
paragraph (h)(1) of this AD, at the applicable times specified in the “Compliance”
paragraph of Boeing Alert Requirements Bulletin 737-25A1873 RB, dated August 25,
2023, do all applicable actions identified in, and in accordance with, the Accomplishment
Instructions of Boeing Alert Requirements Bulletin 737-25A1873 RB, dated August 25,
2023.
Note 1 to paragraph (g)(1): Guidance for accomplishing the actions required by
this AD can be found in Boeing Alert Service Bulletin 737-25A1873, dated August 25,
2023, which is referred to in Boeing Alert Requirements Bulletin 737-25A1873 RB,
dated August 25, 2023.
(2) For Model 737-800 series airplanes: Except as specified by paragraph (h)(2)
of this AD, at the applicable times specified in the “Compliance” paragraph of Boeing
Alert Requirements Bulletin 737-25A1876 RB, dated September 1, 2023, do all
applicable actions identified in, and in accordance with, the Accomplishment Instructions
of Boeing Alert Requirements Bulletin 737-25A1876 RB, dated September 1, 2023.

Note 2 to paragraph (g)(2): Guidance for accomplishing the actions required by
this AD can be found in Boeing Alert Service Bulletin 737-25A1876, dated September 1,
2023, which is referred to in Boeing Alert Requirements Bulletin 737-25A1876 RB,
dated September 1, 2023.
(h) Exceptions to Service Information Specifications
(1) Where the Compliance Time columns of the tables in the “Compliance”
paragraph of Boeing Alert Requirements Bulletin 737-25A1873 RB, dated August 25,
2023, refer to the original issue date of Requirements Bulletin 737-25A1873 RB, this AD
requires using the effective date of this AD.
(2) Where the Compliance Time columns of the tables in the “Compliance”
paragraph of Boeing Alert Requirements Bulletin 737-25A1876 RB, dated September 1,
2023, refer to the original issue date of Requirements Bulletin 737-25A1876 RB, this AD
requires using the effective date of this AD.
(i) Parts Installation Prohibition
As of the effective date of this AD, no person may install a galley wire bundle
spiral wrap made of polyethylene with self-wrapping sleeve on any airplane.
(j) 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 (k)(1) of this AD. Information may be emailed to:
AMOC@faa.gov.

(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.
(k) Related Information
(1) For more information about this AD, contact Julie Linn, Aviation Safety
Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 206-2313584; email: julie.linn@faa.gov.
(2) Service information identified in this AD that is not incorporated by reference
is available at the address specified in paragraph (l)(3) of this AD.
(l) 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 Alert Requirements Bulletin 737-25A1873 RB, dated August 25, 2023.
(ii) Boeing Alert Requirements Bulletin 737-25A1876 RB, dated September 1,
2023.

(3) For service information 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
myboeingfleet.com.
(4) You may view this service information 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 www.archives.gov/federal-register/cfr/ibr-locations or email
fr.inspection@nara.gov.
Issued on June 14, 2024.

Peter A. White,
Deputy Director, Integrated Certificate Management Division,
Aircraft Certification Service.
[FR Doc. 2024-13490 Filed: 6/21/2024 8:45 am; Publication Date: 6/24/2024]