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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: 2025-16-07 Bombardier, Inc.: Amendment 39-23105; Docket No. FAA-2025-0908; Project Identifier MCAI-2025-00035-T. (a) Effective Date This airworthiness directive (AD) is effective September 18, 2025. (b) Affected ADs None. (c) Applicability This AD applies to Bombardier, Inc., Model BD-700-1A10 airplanes, certificated in any category, as identified in Bombardier Service Bulletin 700-35-016, dated June 12, 2024; Bombardier Service Bulletin 700-35-6006, dated June 12, 2024; and Bombardier Service Bulletin 700-35-6503, dated June 12, 2024. (d) Subject Air Transport Association (ATA) of America Code 35, Oxygen. (e) Unsafe Condition This AD was prompted by a report indicating that the clearance between therapeutic flexible oxygen hoses and electrical harnesses may be non-compliant to design requirements, and that positive separation mechanisms and appropriate protective barriers may not have been installed in accordance with the applicable installation standards. The FAA is issuing this AD to prevent damage to the electrical harness for the therapeutic flexible oxygen hose and subsequent latent failure of the firewall hydraulic shutoff valve. The unsafe condition, if not addressed, could result in the inability to control a powerplant fire in the presence of a hydraulic fluid leak. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Detailed Inspections and Related Investigative and Corrective Actions Within 10 years after the effective date of this AD, do all the actions specified in paragraphs (g)(1) through (4) of this AD, and do all the applicable related investigative and corrective actions before further flight, in accordance with sections 2.B and 2.C of the Accomplishment Instructions of Bombardier Service Bulletin 700-35-016, Bombardier Service Bulletin 700-35-6006, and Bombardier Service Bulletin 700-35-6503, all dated June 12, 2024, as applicable. (1) Do a detailed inspection to determine the gap between the clocking angle of the therapeutic oxygen rigid tube to oxygen hose elbow fitting, if equipped, and the nearest electrical harness. (2) Do a detailed inspection of the therapeutic flexible oxygen hose, part number (P/N) 38911-5-0250, for damage and to determine if protection is installed on the hose. (3) Do a detailed inspection of the electrical harnesses surrounding the therapeutic flexible oxygen hose for damage. (4) Do a detailed inspection to determine the clearance between the electrical harnesses and therapeutic flexible oxygen hose. (h) 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, send it to the attention of the person identified in paragraph (i) of this AD and email to: AMOC@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 Bombardier, Inc.'s Transport Canada Design Approval Organization (DAO). If approved by the DAO, the approval must include the DAO-authorized signature. (i) Additional Information For more information about this AD, contact Brenda L. Buitrago, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: 516-228-7300; email: 9-avs-nyaco-cos@faa.gov . (j) 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) Bombardier Service Bulletin 700-35-016, dated June 12, 2024. (ii) Bombardier Service Bulletin 700-35-6006, dated June 12, 2024. (iii) Bombardier Service Bulletin 700-35-6503, dated June 12, 2024. (3) For Bombardier material identified in this AD, contact Bombardier Business Aircraft Customer Response Center, 400 Côte-Vertu Road West, Dorval, Québec H4S 1Y9, Canada; telephone 514-855-2999; email ac.yul@aero.bombardier.com; website bombardier.com . (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 August 1, 2025. Steven W. Thompson, Acting Deputy Director, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2025-15481 Filed 8-13-25; 8:45 am]BILLING CODE 4910-13-P
