[4910-13-P]
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2024-1292; Project Identifier MCAI-2023-00908-T; Amendment
39-22743; AD 2024-09-01]
RIN 2120-AA64
Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate
Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier,
Inc.) Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule; request for comments.
SUMMARY: The FAA is adopting a new airworthiness directive (AD) for certain
Airbus Canada Limited Partnership Model BD-500-1A11 airplanes. This AD was
prompted by a design review that found that the heat generated by a thermal runaway
event, caused by the lithium batteries of the wardrobe personal locator beacon (PLB)
would not be sufficiently mitigated by the PLB design to prevent any adverse effect on
the two portable oxygen cylinder assemblies located near the PLB installation. This AD
requires relocation and replacement of the existing PLB with a new PLB part number at
the left-side forward wardrobe assembly, as specified in a Transport Canada AD, which
is incorporated by reference. This AD also prohibits the installation of affected parts. The
FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective [INSERT DATE 15 DAYS AFTER DATE OF
PUBLICATION IN THE FEDERAL REGISTER].

The Director of the Federal Register approved the incorporation by reference of a
certain publication listed in this AD as of [INSERT DATE 15 DAYS AFTER DATE OF
PUBLICATION IN THE FEDERAL REGISTER].
The FAA must receive comments on this 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. FAA2024-1292; 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, the
mandatory continuing airworthiness information (MCAI), any comments received, and
other information. The street address for Docket Operations is listed above.
Material Incorporated by Reference:
• For Transport Canada material, contact Transport Canada, Transport Canada
National Aircraft Certification, 159 Cleopatra Drive, Nepean, Ontario K1A 0N5, Canada;
telephone 888-663-3639; email TC.AirworthinessDirectivesConsignesdenavigabilite.TC@tc.gc.ca; website tc.canada.ca/en/aviation.

• 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
regulations.gov under Docket No. FAA-2024-1292.
FOR FURTHER INFORMATION CONTACT: William Reisenauer, Aviation Safety
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone
516-228-7300; email 9-avs-nyaco-cos@faa.gov.
SUPPLEMENTARY INFORMATION:
Comments Invited
The FAA invites you to send any written relevant data, views, or arguments about
this final rule. Send your comments to an address listed under ADDRESSES. Include
“Docket No. FAA-2024-1292; Project Identifier MCAI-2023-00908-T” at the beginning
of your comments. The most helpful comments reference a specific portion of the final
rule, 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 final
rule 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 final rule.
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 AD
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 AD, 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 AD. Submissions containing CBI should be sent to William Reisenauer,
Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
telephone 516-228-7300; email 9-avs-nyaco-cos@faa.gov. Any commentary that the
FAA receives which is not specifically designated as CBI will be placed in the public
docket for this rulemaking.
Background
Transport Canada, which is the aviation authority for Canada, has issued
Transport Canada AD CF-2023-57, dated July 25, 2023 (Transport Canada AD CF-202357) (also referred to after this as the MCAI), to correct an unsafe condition on certain
Airbus Canada Limited Partnership Model BD-500-1A11 airplanes. The MCAI states
that a design review of the wardrobe PLB with lithium batteries indicated that certain
original design assumptions were incorrect. The subject PLB, if installed, is in the leftside forward wardrobe. It was found that the heat generated by a thermal runaway event,
caused by the lithium batteries, would not be sufficiently mitigated by the PLB design to
prevent any adverse effect on the two portable oxygen cylinder assemblies (POCAs)
located near the PLB installation. As a result, a thermal runaway could lead to the release
of oxygen from each POCA, which could feed the fire caused by the thermal runaway of
the lithium batteries.
The FAA is issuing this AD to prevent a lithium battery fire of the PLB at the leftside forward wardrobe assembly. The unsafe condition, if not addressed, could result in
fire and smoke in the cabin leading to reduced ability of the flightcrew to maintain the

safe flight and landing of the airplane. You may examine the MCAI in the AD docket at
regulations.gov under Docket No. FAA-2024-1292.
Related Service Information under 1 CFR Part 51
The FAA reviewed Transport Canada AD CF-2023-57, which specifies
procedures for removal of the PLB part number (P/N) 500-12Y, modification of the leftside forward wardrobe assembly, and installation of a new PLB P/N 500-32-2Y-H with a
new mounting bracket and hardware attachments. 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 ADDRESSES.
FAA’s Determination
This product has been approved by the aviation authority of another country and
is approved for operation in the United States. Pursuant to the FAA’s bilateral agreement
with this State of Design Authority, it has notified the FAA of the unsafe condition
described in the MCAI referenced above. The FAA is issuing this AD after determining
that the unsafe condition described previously is likely to exist or develop on other
products of the same type design.
AD Requirements
This AD requires accomplishing the actions specified in Transport Canada AD
CF-2023-57 described previously, except for any differences identified as exceptions in
the regulatory text of this AD. This AD also prohibits the installation of affected parts.
Explanation of Required Compliance Information
In the FAA’s ongoing efforts to improve the efficiency of the AD process, the
FAA developed a process to use some civil aviation authority (CAA) ADs as the primary
source of information for compliance with requirements for corresponding FAA ADs.
The FAA has been coordinating this process with manufacturers and CAAs. As a result,
Transport Canada AD CF-2023-57 is incorporated by reference in this AD. This AD

requires compliance with Transport Canada AD CF-2023-57 in its entirety through that
incorporation, except for any differences identified as exceptions in the regulatory text of
this AD. Service information required by Transport Canada AD CF-2023-57 for
compliance will be available at regulations.gov under Docket No. FAA-2024-1292 after
this AD is published.
Justification for Immediate Adoption and Determination of the Effective Date
Section 553(b)(3)(B) of the Administrative Procedure Act (APA) (5 U.S.C. 551 et
seq.) authorizes agencies to dispense with notice and comment procedures for rules when
the agency, for “good cause,” finds that those procedures are “impracticable,
unnecessary, or contrary to the public interest.” Under this section, an agency, upon
finding good cause, may issue a final rule without providing notice and seeking comment
prior to issuance. Further, section 553(d) of the APA authorizes agencies to make rules
effective in less than thirty days, upon a finding of good cause.
There are currently no domestic operators of these products. Accordingly, notice
and opportunity for prior public comment are unnecessary, pursuant to 5 U.S.C.
553(b)(3)(B). In addition, for the foregoing reason(s), the FAA finds that good cause
exists pursuant to 5 U.S.C. 553(d) for making this amendment effective in less than 30
days.
Regulatory Flexibility Act
The requirements of the Regulatory Flexibility Act (RFA) do not apply when an
agency finds good cause pursuant to 5 U.S.C. 553 to adopt a rule without prior notice and
comment. Because the FAA has determined that it has good cause to adopt this rule
without prior notice and comment, RFA analysis is not required.
Costs of Compliance
Currently, there are no affected U.S.-registered airplanes. If an affected airplane is
imported and placed on the U.S. Registry in the future, the FAA provides the following

cost estimates to comply with this AD:
Estimated costs for required actions
Labor cost

Parts cost

Cost per product

3 work-hours X $85 per hour =
$255

*

$255

* The FAA has received no definitive data on which to base the cost estimates for the
parts specified in this AD.
The FAA has included all known costs in its cost estimate. According to the
manufacturer, however, some or all of the costs of this 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
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, and
(2) Will not affect intrastate aviation in Alaska.
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
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:
2024-09-01 Airbus Canada Limited Partnership (Type Certificate Previously Held
by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.): Amendment
39-22743; Docket No. FAA-2024-1292; Project Identifier MCAI-2023-00908-T.
(a) Effective Date
This airworthiness directive (AD) is effective [INSERT DATE 15 DAYS AFTER
DATE OF PUBLICATION IN THE FEDERAL REGISTER].
(b) Affected ADs
None.
(c) Applicability
This AD applies to Airbus Canada Limited Partnership (type certificate
previously held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.)
Model BD-500-1A11 airplanes, certificated in any category, as identified in Transport
Canada AD CF-2023-57, dated July 25, 2023 (Transport Canada AD CF-2023-57).

(d) Subject
Air Transport Association (ATA) of America Code 25, Equipment/Furnishings.
(e) Unsafe Condition
This AD was prompted by a design review that found that the heat generated by a
thermal runaway event, caused by the lithium batteries of the wardrobe personal locator
beacon (PLB) would not be sufficiently mitigated by the PLB design to prevent any
adverse effect on the two portable oxygen cylinder assemblies located near the PLB
installation. The FAA is issuing this AD to prevent a lithium battery fire at the left-side
forward wardrobe assembly. The unsafe condition, if not addressed, could result in fire
and smoke in the cabin leading to reduced ability of the flightcrew to maintain the safe
flight and landing of the airplane.
(f) Compliance
Comply with this AD within the compliance times specified, unless already done.
(g) PLB Relocation and Replacement
Except as specified in paragraph (h) of this AD: Comply with all required actions
and compliance times specified in, and in accordance with, Transport Canada AD
CF-2023-57.
(h) Exception to Transport Canada AD CF-2023-57
Where Transport Canada AD CF-2023-57 refers to its effective date, 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 PLB part number 50012Y on any airplane.

(j) Additional AD Provisions
The following provisions also apply to this AD:
(1) Alternative Methods of Compliance (AMOCs): The Manager, International
Validation 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 International Validation
Branch, mail it to the address identified in paragraph (k) of this AD. Information may be
emailed to: 9-AVS-NYACO-COS@faa.gov. Before using any approved AMOC, notify
your appropriate principal inspector, or lacking a principal inspector, the manager of the
responsible Flight Standards Office.
(2) Contacting the Manufacturer: For any requirement in this AD to obtain
instructions from a manufacturer, the instructions must be accomplished using a method
approved by the Manager, International Validation Branch, FAA; or Transport Canada;
or Airbus Canada Limited Partnership’s Transport Canada Design Approval Organization
(DAO). If approved by the DAO, the approval must include the DAO-authorized
signature.
(k) Additional Information
For more information about this AD, contact William Reisenauer, Aviation Safety
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516228-7300; email 9-avs-nyaco-cos@faa.gov.
(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 this AD specifies otherwise.
(i) Transport Canada AD CF-2023-57, dated July 25, 2023.
(ii) [Reserved]
(3) For Transport Canada AD CF-2023-57, contact Transport Canada, Transport
Canada National Aircraft Certification, 159 Cleopatra Drive, Nepean, Ontario K1A 0N5,
Canada; telephone 888-663-3639; email TC.AirworthinessDirectivesConsignesdenavigabilite.TC@tc.gc.ca; website tc.canada.ca/en/aviation.
(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 www.archives.gov/federal-register/cfr/ibr-locations, or email
fr.inspection@nara.gov.
Issued on June 11, 2024.

Suzanne Masterson,
Deputy Director, Integrated Certificate Management Division,
Aircraft Certification Service.
[FR Doc. 2024-13141 Filed: 6/14/2024 8:45 am; Publication Date: 6/17/2024]