Rule2025-04320
Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) 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
March 18, 2025
Effective
April 22, 2025
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA is adopting a new airworthiness directive (AD) for all Airbus Canada Limited Partnership Model BD-500-1A10 and BD-500-1A11 airplanes. This AD was prompted by a design review that discovered software protection logic for potential large leaks from the engine bleed duct inside the engine core compartments was partially impaired. This AD requires revising the existing airplane flight manual (AFM) to incorporate the procedures for the flightcrew to manually isolate the opposite functional engine in the event of an engine bleed duct large leak condition, as specified in a Transport Canada AD, which is incorporated by reference (IBR). The FAA is issuing this AD to address the unsafe condition on these products.
Full Text
<html>
<head>
<title>Federal Register, Volume 90 Issue 51 (Tuesday, March 18, 2025)</title>
</head>
<body><pre>
[Federal Register Volume 90, Number 51 (Tuesday, March 18, 2025)]
[Rules and Regulations]
[Pages 12457-12459]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2025-04320]
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2024-2554; Project Identifier MCAI-2024-00492-T;
Amendment 39-22989; AD 2025-06-01]
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.
-----------------------------------------------------------------------
SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all
Airbus Canada Limited Partnership Model BD-500-1A10 and BD-500-1A11
airplanes. This AD was prompted by a design review that discovered
software protection logic for potential large leaks from the engine
bleed duct inside the engine core compartments was partially impaired.
This AD requires revising the existing airplane flight manual (AFM) to
incorporate the procedures for the flightcrew to manually isolate the
opposite functional engine in the event of an engine bleed duct large
leak condition, as specified in a Transport Canada AD, which is
incorporated by reference (IBR). The FAA is issuing this AD to address
the unsafe condition on these products.
DATES: This AD is effective April 22, 2025.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of April 22,
2025.
ADDRESSES:
AD Docket: You may examine the AD docket at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2024-2554; 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
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 Transport Canada material identified in this AD,
contact Transport Canada, Transport Canada National Aircraft
Certification, 159 Cleopatra Drive, Nepean, Ontario K1A 0N5,
[[Page 12458]]
Canada; telephone 888-663-3639; email <a href="/cdn-cgi/l/email-protection#a3f7e08de2cad1d4ccd1d7cbcacdc6d0d0e7cad1c6c0d7cad5c6d08ee0cccdd0cac4cdc6d0c7c6cdc2d5cac4c2c1cacfcad7c68df7e0e3d7c08dc4c08dc0c2"><span class="__cf_email__" data-cfemail="1a4e59345b73686d75686e7273747f69695e73687f796e736c7f693759757469737d747f697e7f747b6c737d7b787376736e7f344e595a6e79347d7934797b">[email protected]</span></a>. You may find this material on the
Transport Canada website at tc.canada.ca/en/aviation.
<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-2024-2554.
FOR FURTHER INFORMATION CONTACT: Joseph Catanzaro, Aviation Safety
Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 516-
228-7300; email: <a href="/cdn-cgi/l/email-protection#af9682ced9dc82c1d6ceccc082ccc0dcefc9cece81c8c0d9"><span class="__cf_email__" data-cfemail="023b2f6374712f6c7b63616d2f616d71426463632c656d74">[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 Airbus Canada
Limited Partnership Model BD-500-1A10 and BD-500-1A11 airplanes. The
NPRM published in the Federal Register on December 13, 2024 (89 FR
100923). The NPRM was prompted by AD CF-2024-30, dated August 27, 2024,
issued by Transport Canada, which is the aviation authority for Canada
(Transport Canada AD CF-2024-30) (also referred to as the MCAI). The
MCAI states a design review discovered software protection logic for
potential large leaks from the engine bleed duct inside the engine core
compartments was partially impaired. Under certain large leak
conditions (e.g., a duct burst at a specific portion of the engine's
bleed ducting), Pratt & Whitney's PW1500G engine's electronic engine
control (EEC) would not transmit the necessary information to the
aircraft controller to automatically isolate the opposite engine from
the leak path in the bleed system. This failure condition could lead to
a dual engine failure.
In the NPRM, the FAA proposed to require revising the existing AFM
to incorporate the procedures for the flightcrew to manually isolate
the opposite functional engine in the event of an engine bleed duct
large leak condition, as specified in Transport Canada AD CF-2024-30.
The FAA is issuing 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-2024-2554.
Discussion of Final Airworthiness Directive
Comments
The FAA received a comment from Air Line Pilots Association,
International (ALPA) who supported the NPRM without change.
Conclusion
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 reviewed the relevant data, considered the
comment 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 this product. Except for minor editorial changes,
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
Transport Canada AD CF-2024-30 specifies procedures for revising
the ``Non-Normal Procedure'' of the AFM to incorporate the procedures
for the flightcrew to manually isolate the opposite functional engine
in the event of an engine bleed duct large leak condition. 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 132 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:
Estimated Costs for Required Actions
----------------------------------------------------------------------------------------------------------------
Cost on U.S.
Labor cost Parts cost Cost per product operators
----------------------------------------------------------------------------------------------------------------
1 work-hour x $85 per hour = $85............................ $0 $85 $11,220
----------------------------------------------------------------------------------------------------------------
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(f), 40113, 44701.
[[Page 12459]]
Sec. 39.13 [Amended]
0
2. The FAA amends Sec. 39.13 by adding the following new airworthiness
directive:
2025-06-01 Airbus Canada Limited Partnership (Type Certificate
Previously Held by C Series Aircraft Limited Partnership (CSALP);
Bombardier, Inc.): Amendment 39-22989; Docket No. FAA-2024-2554;
Project Identifier MCAI-2024-00492-T.
(a) Effective Date
This airworthiness directive (AD) is effective April 22, 2025.
(b) Affected ADs
None.
(c) Applicability
This AD applies to all 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.
(d) Subject
Air Transport Association (ATA) of America Code 72, Turbine/
turboprop engine.
(e) Unsafe Condition
This AD was prompted by a design review that discovered software
protection logic for potential large leaks from the engine bleed
duct inside the engine core compartments was partially impaired.
Under certain large leak conditions (e.g., a duct burst at a
specific portion of the engine's bleed ducting), Pratt & Whitney's
PW1500G engine's electronic engine control (EEC) would not transmit
the necessary information to the aircraft controller to
automatically isolate the opposite engine from the leak path in the
bleed system. The FAA is issuing this AD to address the unsafe
condition, which if not addressed, could result in dual engine
failure.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Requirements
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-2024-30, dated August 27,
2024 (Transport Canada AD CF-2024-30).
(h) Exception to Transport Canada AD CF-2024-30
(1) Where Transport Canada AD CF-2024-30 refers to its effective
date, this AD requires using the effective date of this AD.
(2) Where paragraph B. of Transport Canada AD CF-2024-30
specifies to ``inform all flight crews of these changes in the AFM
procedures and thereafter operate the aeroplane accordingly,'' this
AD does not require those actions as those actions are already
required by existing FAA operating regulations (see 14 CFR 91.9, 14
CFR 91.505, and 14 CFR 121.137).
(i) 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 (j) of this AD and email to:
<a href="/cdn-cgi/l/email-protection#a6e7ebe9e5e6c0c7c788c1c9d0"><span class="__cf_email__" data-cfemail="23626e6c60634542420d444c55">[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; 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.
(j) Additional Information
For more information about this AD, contact Joseph Catanzaro,
Aviation Safety Engineer, FAA, 2200 South 216th St., Des Moines, WA
98198; phone: 516-228-7300; email: <a href="/cdn-cgi/l/email-protection#437a6e2235306e2d3a22202c6e202c30032522226d242c35"><span class="__cf_email__" data-cfemail="88b1a5e9fefba5e6f1e9ebe7a5ebe7fbc8eee9e9a6efe7fe">[email protected]</span></a>.
(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 this AD specifies otherwise.
(i) Transport Canada AD CF-2024-30, dated August 27, 2024.
(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#7125325f301803061e030519181f140202351803141205180714025c321e1f0218161f140215141f100718161013181d1805145f25323105125f16125f1210"><span class="__cf_email__" data-cfemail="f2a6b1dcb39b80859d80869a9b9c978181b69b809791869b849781dfb19d9c819b959c978196979c93849b9593909b9e9b8697dca6b1b28691dc9591dc9193">[email protected]</span></a>, You may view 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#1177633f787f6261747265787e7f517f7063703f767e67"><span class="__cf_email__" data-cfemail="cea8bce0a7a0bdbeabadbaa7a1a08ea0afbcafe0a9a1b8">[email protected]</span></a>.
Issued on March 11, 2025.
Peter A. White,
Deputy Director, Integrated Certificate Management Division, Aircraft
Certification Service.
[FR Doc. 2025-04320 Filed 3-17-25; 8:45 am]
BILLING CODE 4910-13-P
</pre><script data-cfasync="false" src="/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js"></script></body>
</html>Indexed from Federal Register on March 18, 2025.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.