Proposed Rule2025-20323
Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes
Primary source
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Published
November 19, 2025
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA proposes to supersede Airworthiness Directive (AD) 2024-04-06, which applies to certain Airbus Canada Limited Partnership Model BD-500-1A10 and BD-500-1A11 airplanes. AD 2024-04-06 requires repetitive operational checks of the gravity cross flow shut-off valve and, for certain airplanes, a one-time inspection of the motive flow fuel-feed tubes at the clamp blocks location, and applicable corrective action. Since the FAA issued AD 2024-04-06, the manufacturer developed additional corrective actions. This proposed AD would continue to require the actions in AD 2024-04-06 and would require replacement of the saddle clamp, inspection of the motive flow fuel-feed tubes, and applicable corrective 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 90 Issue 221 (Wednesday, November 19, 2025)</title>
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[Federal Register Volume 90, Number 221 (Wednesday, November 19, 2025)]
[Proposed Rules]
[Pages 52005-52008]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2025-20323]
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Proposed Rules
Federal Register
________________________________________________________________________
This section of the FEDERAL REGISTER contains notices to the public of
the proposed issuance of rules and regulations. The purpose of these
notices is to give interested persons an opportunity to participate in
the rule making prior to the adoption of the final rules.
========================================================================
Federal Register / Vol. 90, No. 221 / Wednesday, November 19, 2025 /
Proposed Rules
[[Page 52005]]
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2025-5024; Project Identifier MCAI-2025-00797-T]
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: Notice of proposed rulemaking (NPRM).
-----------------------------------------------------------------------
SUMMARY: The FAA proposes to supersede Airworthiness Directive (AD)
2024-04-06, which applies to certain Airbus Canada Limited Partnership
Model BD-500-1A10 and BD-500-1A11 airplanes. AD 2024-04-06 requires
repetitive operational checks of the gravity cross flow shut-off valve
and, for certain airplanes, a one-time inspection of the motive flow
fuel-feed tubes at the clamp blocks location, and applicable corrective
action. Since the FAA issued AD 2024-04-06, the manufacturer developed
additional corrective actions. This proposed AD would continue to
require the actions in AD 2024-04-06 and would require replacement of
the saddle clamp, inspection of the motive flow fuel-feed tubes, and
applicable corrective 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 January 5,
2026.
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-2025-5024; 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, 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:
<bullet> For Transport Canada material identified in this proposed
AD, contact Transport Canada, Transport Canada National Aircraft
Certification, 159 Cleopatra Drive, Nepean, Ontario K1A 0N5, Canada;
telephone 888-663-3639; email <a href="/cdn-cgi/l/email-protection#1044533e517962677f626478797e756363547962757364796675633d537f7e6379777e756374757e716679777172797c7964753e44535064733e77733e7371"><span class="__cf_email__" data-cfemail="0f5b4c214e667d78607d7b6766616a7c7c4b667d6a6c7b66796a7c224c60617c6668616a7c6b6a616e7966686e6d6663667b6a215b4c4f7b6c21686c216c6e">[email protected]</span></a>. You may find this material on the
Transport Canada website at tc.canada.ca/en/aviation. It is also
available at <a href="http://regulations.gov">regulations.gov</a> under Docket No. FAA-2025-5024.
<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.
FOR FURTHER INFORMATION CONTACT: Erica Bayles, Aviation Safety
Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 907-
271-5844; email: <a href="/cdn-cgi/l/email-protection#aecbdcc7cdcf80cb80cccfd7c2cbddeec8cfcf80c9c1d8"><span class="__cf_email__" data-cfemail="92f7e0fbf1f3bcf7bcf0f3ebfef7e1d2f4f3f3bcf5fde4">[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 using a method listed
under the ADDRESSES section. Include ``Docket No. FAA-2025-5024;
Project Identifier MCAI-2025-00797-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 Erica
Bayles, Aviation Safety Engineer, FAA, 2200 South 216th St., Des
Moines, WA 98198; phone: 907-271-5844; email: <a href="/cdn-cgi/l/email-protection#1570677c76743b703b77746c797066557374743b727a63"><span class="__cf_email__" data-cfemail="ec899e858f8dc289c28e8d9580899fac8a8d8dc28b839a">[email protected]</span></a>.
Any commentary that the FAA receives which is not specifically
designated as CBI will be placed in the public docket for this
rulemaking.
Background
The FAA issued AD 2024-04-06, Amendment 39-22685 (89 FR 19228,
March 18, 2024) (AD 2024-04-06), for certain Airbus Canada Limited
Partnership Model BD-500-1A10 and BD-500-1A11 airplanes. AD 2024-04-06
was prompted by an MCAI originated by Transport Canada, which is the
aviation authority for Canada. Transport Canada issued AD CF-2022-70,
dated December 21, 2022, to correct an unsafe condition.
AD 2024-04-06 requires repetitive operational checks of the gravity
cross flow shut-off valve and, for certain airplanes, a one-time
inspection of the motive flow fuel-feed tubes at the clamp blocks
location, and applicable
[[Page 52006]]
corrective action. The FAA issued AD 2024-04-06 to address mechanical
wear damage on the motive flow fuel-feed tubes.
Actions Since AD 2024-04-06 Was Issued
AD 2024-04-06 explains that the FAA considers the requirements
``interim action'' and was considering further rulemaking. The FAA has
now determined that further rulemaking is necessary, and this proposed
AD follows from that determination. Since the FAA issued AD 2024-04-06,
Transport Canada superseded AD CF-2022-70, dated December 21, 2022, and
issued Transport Canada AD CF-2025-24, dated April 29, 2025 (Transport
Canada AD CF-2025-24) (also referred to as the MCAI), to correct an
unsafe condition for certain Airbus Canada Limited Partnership Model
BD-500-1A10 and BD-500-1A11 airplanes. The MCAI states there have been
several findings of mechanical wear damage on the motive flow fuel-feed
tubes that were secured by bonding clamps and clamp blocks inside the
collector tank. In some instances, the wear damage led to a hole in a
motive flow fuel-feed tube resulting in a fuel imbalance during flight
that required the flightcrews to correct the imbalance using the
gravity transfer system. Failure of the affected motive flow fuel-feed
tubes and a subsequent failure of the gravity transfer system could
lead to a fuel imbalance condition resulting in a reduction in airplane
functional capabilities and increased crew workload. The MCAI also
states that since AD CF-2022-70 was issued, the manufacturer issued new
service information to require replacement of the saddle clamp of the
motive flow tubes, along with an inspection and rectification of the
flow fuel-feed tubes.
The FAA is proposing this AD to address the unsafe condition on
these products. You may examine the MCAI in the AD docket at
<a href="http://regulations.gov">regulations.gov</a> under Docket No. FAA-2025-5024.
Explanation of Retained Requirements
Although this proposed AD does not explicitly restate the
requirements of AD 2024-04-06, this proposed AD would retain all of the
requirements of AD 2024-04-06. Those requirements are referenced in
Transport Canada AD CF-2025-24, which, in turn, is referenced in
paragraph (g) of this proposed AD.
Material Incorporated by Reference Under 1 CFR Part 51
The FAA reviewed Transport Canada AD CF-2025-24, which specifies
procedures for performing a repetitive operational check of the gravity
cross flow shut-off valve and, for certain airplanes, inspecting the
motive flow fuel-feed tubes for mechanical wear damage (damage
includes, but is not limited to, cracks, scores, scratches, nicks, and
gouges) and pre-load condition, and, based on findings, replacing the
motive flow fuel-feed tube. This material also specifies procedures for
replacing the saddle clamp of the motive flow fuel-feed tubes on both
left and right sides, inspecting the motive flow fuel-feed tubes for
damage (damage includes, but is not limited to, cracks, scores,
scratches, nicks, and gouges) and, based on findings, repairing or
replacing the motive flow fuel-feed tube. 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.
FAA's Determination
These products have been approved by the civil aviation authority
of another country and are approved for operation in the United States.
Pursuant to the FAA's bilateral agreement with this State of Design
Authority, that authority has notified the FAA of the unsafe condition
described in the MCAI referenced above. The FAA is issuing this NPRM
after determining that the unsafe condition described previously is
likely to exist or develop in other products of the same type design.
Proposed AD Requirements in This NPRM
This proposed AD would require accomplishing the actions specified
in Transport Canada AD CF-2025-24 described previously, except for any
differences identified as exceptions in the regulatory text of this
proposed AD.
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, the
FAA proposes to incorporate Transport Canada AD CF-2025-24 by reference
in the FAA final rule. This proposed AD would, therefore, require
compliance with Transport Canada AD CF-2025-24 in its entirety through
that incorporation, except for any differences identified as exceptions
in the regulatory text of this proposed AD. Material required by
Transport Canada AD CF-2025-24 for compliance will be available at
<a href="http://regulations.gov">regulations.gov</a> under Docket No. FAA-2025-5024 after the FAA final rule
is published.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would
affect 94 airplanes of U.S. registry. The FAA estimates the following
costs to comply with this proposed AD:
Estimated Costs for Required Actions
----------------------------------------------------------------------------------------------------------------
Cost on U.S.
Action Labor cost Parts cost Cost per product operators
----------------------------------------------------------------------------------------------------------------
Retained actions from AD 2024-04- Up to 16.5 work- $0 Up to $1,403....... Up to $117,810.
06. hours x $85 per
hour = $1,403.
New proposed actions............. 6 work-hours x $85 704 $1,214............. $114,116.
per hour = $510.
----------------------------------------------------------------------------------------------------------------
The FAA estimates the following costs to do any necessary on-
condition action that would be required based on the results of any
required actions. The FAA has no way of determining the number of
aircraft that might need this on-condition action:
[[Page 52007]]
Estimated Costs of On-Condition Actions
------------------------------------------------------------------------
Labor cost Parts cost Cost per product
------------------------------------------------------------------------
12 work-hours x $85 per hour = $5,256............ $6,276.
$1,020 (retained on-condition
actions from AD 2024-04-06).
Up to 12 work-hours x $84 per Up to $5,130...... Up to $6,150.
hour = $1,020 (new proposed on-
condition actions).
------------------------------------------------------------------------
According to the manufacturer, some or all of the costs of this
proposed AD may be covered under warranty, thereby reducing the cost
impact on affected individuals. The FAA does not control warranty
coverage for affected individuals. As a result, the FAA has included
all known costs in the cost estimate.
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:
0
a. Removing Airworthiness Directive (AD) 2024-04-06, Amendment 39-22685
(89 FR 19228, March 18, 2024); and
0
b. Adding the following new AD:
Airbus Canada Limited Partnership (Type Certificate Previously Held
by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.):
Docket No. FAA-2025-5024; Project Identifier MCAI-2025-00797-T.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by January 5, 2026.
(b) Affected ADs
This AD replaces AD 2024-04-06, Amendment 39-22685 (89 FR 19228,
March 18, 2024) (AD 2024-04-06).
(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-500-1A10 and BD-500-1A11
airplanes, certificated in any category, as identified in Transport
Canada AD CF-2025-24, dated April 29, 2025 (Transport Canada AD CF-
2025-24).
(d) Subject
Air Transport Association (ATA) of America Code 28, Fuel.
(e) Unsafe Condition
This AD was prompted by reports of mechanical wear damage on the
motive flow fuel-feed tubes that were secured by bonding clamps and
clamp blocks inside the collector tank. This AD was also prompted by
a determination that replacement of the saddle clamps of the motive
flow tubes is also needed to address the unsafe condition. The FAA
is issuing this AD to address mechanical wear damage on the motive
flow fuel-feed tubes. The unsafe condition, if not addressed, could
result in failure of the affected motive flow fuel-feed tubes and a
subsequent failure of the gravity transfer system, which could lead
to a fuel imbalance condition resulting in a reduction in airplane
functional capabilities and increased crew workload.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Requirements
Except as specified in paragraphs (h) and (i) of this AD: Comply
with all required actions and compliance times specified in, and in
accordance with, Transport Canada AD CF-2025-24.
(h) Exception to Transport Canada AD CF-2025-24
(1) Where Transport Canada AD CF-2025-24 refers to its effective
date, this AD requires using the effective date of this AD.
(2) Where Transport Canada AD CF-2025-24 refers to hours air
time, this AD requires using flight hours.
(3) Where Transport Canada AD CF-2025-24 refers to ``4 January
2023'' [the effective date of AD CF-2022-70], this AD requires using
April 22, 2024 (the effective date of AD 2024-04-06).
(4) Where Parts II and III of Transport Canada AD CF-2025-24
specify ``rectify, as applicable,'' this AD requires replacing that
text with ``accomplish all applicable corrective actions before
further flight''.
(5) Where the service information referenced in Part II of
Transport Canada AD CF-2025-24 specifies to do rework if there is no
damage or paint damage only, operators may either do the rework or
replace the fuel tubes as specified in the service information
referenced in Part II of Transport Canada AD CF-2025-24.
(6) Where Part III of Transport Canada AD CF-2025-24 specifies
inspecting for ``a damage'', this AD requires replacing that text
with ``damage (damage includes, but is not limited to, cracks,
scores, scratches, nicks, and gouges)''.
(i) No Reporting Requirement
Although the service information referenced in Transport Canada
AD CF-2025-24 specifies to submit certain information to the
manufacturer, this AD does not include that requirement.
[[Page 52008]]
(j) Additional AD Provisions
The following provisions also apply to this AD:
(1) Alternative Methods of Compliance (AMOCs): 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 Continued Operational Safety Branch, send it to the attention of
the person identified in paragraph (k) of this AD and email to:
<a href="/cdn-cgi/l/email-protection#0445494b47446265652a636b72"><span class="__cf_email__" data-cfemail="10515d5f53507671713e777f66">[email protected]</span></a>. 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, AIR-520,
Continued Operational Safety Branch, FAA; or Transport Canada;
Airbus Canada Limited Partnership (Type Certificate Previously Held
by C Series Aircraft Limited Partnership (CSALP); Bombardier,
Inc.)'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 Erica Bayles,
Aviation Safety Engineer, FAA, 2200 South 216th St., Des Moines, WA
98198; phone: 907-271-5844; email: <a href="/cdn-cgi/l/email-protection#92f7e0fbf1f3bcf7bcf0f3ebfef7e1d2f4f3f3bcf5fde4"><span class="__cf_email__" data-cfemail="6005120903014e054e0201190c0513200601014e070f16">[email protected]</span></a>.
(l) 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 this AD specifies otherwise.
(i) Transport Canada AD CF-2025-24, dated April 29, 2025.
(ii) [Reserved]
(3) For Transport Canada material identified in this AD, contact
Transport Canada, Transport Canada National Aircraft Certification,
159 Cleopatra Drive, Nepean, Ontario K1A 0N5, Canada; telephone 888-
663-3639; email <a href="/cdn-cgi/l/email-protection#06524528476f74716974726e6f68637575426f746365726f7063752b456968756f6168637562636867706f6167646f6a6f7263285245467265286165286567"><span class="__cf_email__" data-cfemail="c29681ec83abb0b5adb0b6aaabaca7b1b186abb0a7a1b6abb4a7b1ef81adacb1aba5aca7b1a6a7aca3b4aba5a3a0abaeabb6a7ec968182b6a1eca5a1eca1a3">[email protected]</span></a>. You may find this material on
the Transport Canada website at 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 <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#cdabbfe3a4a3bebda8aeb9a4a2a38da3acbface3aaa2bb"><span class="__cf_email__" data-cfemail="d2b4a0fcbbbca1a2b7b1a6bbbdbc92bcb3a0b3fcb5bda4">[email protected]</span></a>.
Issued on November 17, 2025.
Peter A. White,
Deputy Director, Integrated Certificate Management Division, Aircraft
Certification Service.
[FR Doc. 2025-20323 Filed 11-18-25; 8:45 am]
BILLING CODE 4910-13-P
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