2024-18-06: Engine exhaust

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: 2024-18-06 Bombardier, Inc.: Amendment 39-22840; Docket No. FAA-2024-1468; Project Identifier MCAI-2023-00975-T. (a) Effective Date This airworthiness directive (AD) is effective January 23, 2025. (b) Affected ADs None. (c) Applicability This AD applies to Bombardier, Inc., Model BD-700-2A12 airplanes, certificated in any category, serial numbers 70007, 70008, 70010, 70012 through 70047 inclusive, 70049, 70051, 70052, 70053, 70055 through 70077 inclusive, 70079, 70080, 70081, 70083 through 70133 inclusive, 70135, 70136, 70137, 70138, 70142 through 70148 inclusive, 70150, 70152, and 70158. (d) Subject Air Transport Association (ATA) of America Code 78, Engine exhaust. (e) Unsafe Condition This AD was prompted by reports that the pivot door pressure seals on the thrust reverser fixed structure were found disbonded or missing on several airplanes. The FAA is issuing this AD to address the pivot door pressure seals on the thrust reverser fixed structure. The unsafe condition, if not addressed, could result in engine thrust loss due to flow path overboard leakage during forward thrust operation and reduce airplane performance during one-engine inoperative conditions in climb margin and ceiling altitude. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Inspection and Functional Test (1) Within 750 flight hours or 18 months, whichever comes first from the effective date of this AD, perform a general visual inspection for discrepancies (missing, damaged, or disbonding) of the 4 pivot door pressure seals on the thrust reverser door of each engine, and perform a bonding check as applicable, and repair or replace each discrepant seal as applicable, in accordance with Part 2.B of the Accomplishment Instructions of Bombardier Service Bulletin 700-78-7501, Revision 01, dated July 13, 2023. Applicable corrective actions must be done before further flight. (2) Before further flight after accomplishing the actions specified in paragraph (g)(1) of this AD: Perform a functional test of the thrust reverser in accordance with Part 2.C of the Accomplishment Instructions of Bombardier Service Bulletin 700-78-7501, Revision 01, dated July 13, 2023. (h) Credit for Previous Actions This paragraph provides credit for actions required by paragraph (g) of this AD, if those actions were performed before the effective date of this AD using Bombardier Service Bulletin 700-78-7501, dated April 12, 2023. (i) No Reporting Requirement Although the service information referenced in Bombardier Service Bulletin 700-78-7501, Revision 01, dated July 13, 2023, specifies to submit certain information to the manufacturer, this AD does not include that requirement. (j) 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 (k) 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, 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. (k) Additional Information For more information about this AD, contact Joseph Catanzaro, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7300; email [email protected]. (l) 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) Bombardier Service Bulletin 700-78-7501, Revision 01, dated July 13, 2023. (ii) [Reserved] (3) For Bombardier, Inc., 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 [email protected]; website bombardier.com . (4) You may view this material at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th Street, 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 October 24, 2024. Victor Wicklund, Deputy Director, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2024-30229 Filed 12-18-24; 8:45 am]BILLING CODE 4910-13-P