[4910-13-P]
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2024-1703; Project Identifier MCAI-2023-01054-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 adopt a new airworthiness directive (AD) for Airbus
Canada Limited Partnership Model BD-500-1A11 airplanes. This proposed AD was
prompted by a design review of aircraft structural and stress reports that resulted in a
revision of operational loads for some aircraft flight phases. This proposed AD would
require using a certain version of the aircraft structural repair manual (ASRP) and a
review and disposition of repairs based on previous versions, as specified in a Transport
Canada AD, which is proposed for incorporation by reference (IBR). 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. FAA2024-1703; 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:
• For material that is proposed for IBR in this AD, 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. You may find this material on the Transport
Canada website at tc.canada.ca/en/aviation. It is also available at regulations.gov under
Docket No. FAA-2024-1703.
• 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: Deep Gaurav, Aviation Safety
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516228-7300; 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 proposal. Send your comments to an address listed under ADDRESSES. Include
“Docket No. FAA-2024-1703; Project Identifier MCAI-2023-01054-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 Deep Gaurav,
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-2023-70, dated October 5, 2023 (Transport Canada AD CF2023-70) (also referred to as the MCAI), to correct an unsafe condition for all Airbus
Canada Limited Partnership Model BD-500-1A11 airplanes. The MCAI states that a
design review of aircraft structural and stress reports for model BD-500-1A10 and BD500-1A11 airplanes has resulted in a revision of operational loads for some aircraft flight
phases, affecting certain aircraft sections. As a result, repairs and damage assessments
accomplished on aircraft to date may have exceeded the available structural margins and
require review to ensure they comply with the revised stress data for the affected
sections. The MCAI also states that Transport Canada AD CF-2023-37, dated May 30,
2023, mandates that ASRP 136.01 or later approved versions, or Airbus Canada source
data approved at the time of the disposition, is to be used for any new structural
assessments, repairs and dispositions for all model BD-500-1A10 and model BD-5001A11 airplanes. The MCAI mandates the review and disposition of all repairs and
damage assessments for affected structure and prohibits the use of previously authorized
repairs as source data to generate new repairs for affected structure for model BD-5001A11 airplanes.
The FAA is proposing this AD to address in-service repairs in some structural
areas that require verification, and possibly further repair, because, if not addressed, they
can cause negative margins for the load envelopes.
You may examine the MCAI in the AD docket at regulations.gov under Docket
No. FAA-2024-1703.

Related Service Information Under 1 CFR Part 51
Transport Canada AD CF-2023-70 specifies procedures for additional corrective
action for model BD-500-1A11 airplanes to review and disposition all repairs and
damage assessments and prohibits the use of certain previously authorized repairs as
source data to generate new repairs for affected structure. 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 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-2023-70 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-2023-70 by reference in the
FAA final rule. This proposed AD would, therefore, require compliance with Transport
Canada AD CF-2023-70 in its entirety through that incorporation, except for any

differences identified as exceptions in the regulatory text of this proposed AD. Service
information required by Transport Canada AD CF-2023-70 for compliance will be
available at regulations.gov under Docket No. FAA-2024-1703 after the FAA final rule is
published.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would affect 71
airplanes of U.S. registry. The FAA estimates the following costs to comply with this
proposed AD:
Estimated costs for required actions
Labor cost

Parts cost

Cost per product

Cost on U.S. operators

2 work-hours X $85
per hour = $170

$0

$170

$12,070

The FAA has received no definitive data on which to base the cost estimates for
the on-condition actions specified in this proposed 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 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
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:

Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series
Aircraft Limited Partnership (CSALP); Bombardier, Inc.): Docket No. FAA-20241703; Project Identifier MCAI-2023-01054-T.
(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 all 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.
(d) Subject
Air Transport Association (ATA) of America Code 51, Standard
practices/structures.
(e) Unsafe Condition
This AD was prompted by a design review of aircraft structural and stress reports
that resulted in a revision of operational loads for some aircraft flight phases, affecting
certain aircraft sections. The FAA is issuing this AD to address in-service repairs in some
structural areas that require verification, and possibly further repair. The unsafe
condition, if not addressed, could result in negative margins for the load envelopes.
(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 CF2023-70, dated October 5, 2023 (Transport Canada AD CF-2023-70).
(h) Exception to Transport Canada AD CF-2023-70
(1) Where Transport Canada AD CF-2023-70 refers to its effective date, this AD
requires using the effective date of this AD.
(2) Where paragraph B. of Part I of Transport Canada AD CF-2023-70 specifies
operators may use Airbus Canada source data, for this AD, any repair using Airbus
Canada source data 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.
(3) Where the definition of “Affected Structure” in Transport Canada AD CF2023-70 specifies “as identified in Service Bulletin (SB) BD500-530012, Issue 001,
dated 13 September 2023 or later revisions approved by the Chief, Continuing
Airworthiness, Transport Canada,” this AD requires replacing that text with “as identified
in Airbus Canada Service Bulletin (SB) BD500-530012, Issue 001, dated September 13,
2023.”
(i) 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 (j) 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 DAO. If approved by the
DAO, the approval must include the DAO-authorized signature.
(j) Additional Information
For more information about this AD, contact Deep Gaurav, Aviation Safety
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516228-7300; email 9-avs-nyaco-cos@faa.gov.
(k) 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-2023-70, dated October 5, 2023.
(ii) [Reserved]
(3) For Transport Canada AD CF-2023-70, 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. You may find this Transport Canada AD 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 www.archives.gov/federal-register/cfr/ibr-locations, or email
fr.inspection@nara.gov.

Issued on June 26, 2024.

Suzanne Masterson,
Deputy Director, Integrated Certificate Management Division,
Aircraft Certification Service.

[FR Doc. 2024-14522 Filed: 7/2/2024 8:45 am; Publication Date: 7/3/2024]