2025-06-06: Fuselage

1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. 2. The FAA amends § 39.13 by adding the following new airworthiness directive: 2025-06-06 Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.): Amendment 39-22994; Docket No. FAA-2024-2019; Project Identifier MCAI-2023-00909-T. (a) Effective Date This airworthiness directive (AD) is effective May 2, 2025. (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-500-1A10 and BD-500-1A11 airplanes, certificated in any category, as identified in Transport Canada AD CF-2023-58, dated July 25, 2023 (Transport Canada AD CF-2023-58). (d) Subject Air Transport Association (ATA) of America Code 26, Fire Protection; 53, Fuselage. (e) Unsafe Condition This AD was prompted by a design review that found insufficient clearance between fire extinguishing system (FIREX) lines and certain fasteners in the center mid-fuselage area. The FAA is issuing this AD to address fouling between the FIREX lines and the fasteners, which could lead to a rupture of the line. This would result in a dormant failure of the cargo compartment fire extinguishing system. The unsafe condition, if not addressed, could result in loss of fire extinguishing capability during a cargo compartment fire. (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-2023-58. (h) Exception to Transport Canada AD CF-2023-58 (1) Where Transport Canada AD CF-2023-58 refers to its effective date, this AD requires using the effective date of this AD. (2) Where Transport Canada AD CF-2023-58 refers to hours air time, this AD requires using flight hours. (3) Where the "Compliance" paragraph of Transport Canada AD CF-2023-58 specifies the compliance time to accomplish the actions, for this AD, the compliance time is at the applicable time specified in paragraph (h)(3)(i) or (ii), whichever occurs later. (i) Within the time specified in the "Compliance" paragraph of Transport Canada AD CF-2023-58. (ii) Within 90 days after the effective date of this AD. (4) The figures of the service information referenced in Transport Canada AD CF-2023-58 include certain incorrect bolt numbers; paragraphs (h)(4)(i) through (v) of this AD provide applicable corrections. (i) "HST110AG6" should be "HST110AG6-5" instead. (ii) "HST111AG6" should be "HST111AG6-5" instead. (iii) "HST410AG6" should be "HST410AG6-5" instead. (iv) "HST411AG6" should be "HST411AG6-5" instead. (v) "0206003AG6-5" should be "B0206003AG6-5" instead. (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, mail it to the address identified in paragraph (j) of this AD. Information may be emailed to: [email protected] . 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 Yaser Osman, Aviation Safety Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; telephone 516-228-7300; email [email protected] . (k) Material Incorporated by Reference (1) The Director of the Federal Register approved the incorporation by reference (IBR) 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-2023-58, dated July 25, 2023. (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 [email protected] . You may find this Transport Canada 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 www.archives.gov/federal-register/cfr/ibr-locations or email [email protected] . Issued on March 13, 2025. Peter A. White, Deputy Director, Integrated Certificate Management Division, Aircraft Certification Service. [FR Doc. 2025-05294 Filed 3-27-25; 8:45 am]BILLING CODE 4910-13-P