2024-16-18: Nacelles/Pylons

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: 2024-16-18 Bombardier, Inc.: Amendment 39-22824; Docket No. FAA-2024-1479; Project Identifier MCAI-2023-00657-T. (a) Effective Date This airworthiness directive (AD) is effective October 30, 2024. (b) Affected ADs None. (c) Applicability This AD applies to Bombardier, Inc., Model BD-100-1A10 airplanes, certificated in any category, having serial numbers (S/Ns) 20002 through 20912 inclusive. (d) Subject Air Transport Association (ATA) of America Code America Code 54, Nacelles/Pylons. (e) Unsafe Condition This AD was prompted by a determination that new or more restrictive airworthiness limitations are necessary. The FAA is issuing this AD to address potential failures of the aft engine mount attachment bolt, part number MS21250-07. The unsafe condition, if not addressed, could lead to the detachment of the engine from the airplane, which could contribute to a catastrophic failure. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Maintenance or Inspection Program Revision Within 60 days after the effective date of this AD, revise the existing maintenance or inspection program, as applicable, to incorporate the information specified in paragraphs (g)(1) and (2) of this AD, as applicable. The initial compliance time for doing the tasks is at the time specified in the applicable time limit/maintenance check (TLMC) document specified in paragraphs (g)(1) and (2) of this AD, or within 60 days after the effective date of this AD, whichever occurs later. (1) For airplane S/Ns 20002 through 20500 inclusive: Task 54-51-00-111* "Discard of the Aft Engine Mount Bolts, Part No. MS21250-07, Non-Serialized," Section 5-10-10 "Life Limits (Structures)," Part 2, "Airworthiness Limitations," of the Bombardier Challenger 300 Time Limits/Maintenance Check, Publication No. CH 300 TLMC, Revision 24, dated August 9, 2023. (2) For airplane S/Ns 20501 through 20912 inclusive: Task 54-51-00-111* "Discard of the Aft Engine Mount Bolts, Part No. MS21250-07, Non-Serialized," Section 5-10-10 "Life Limits (Structures)," Part 2 "Airworthiness Limitations," of the Bombardier Challenger 350 Time Limits/Maintenance Check, Publication No. CH 350 TLMC, Revision 14, dated August 9, 2023. Note 1 to paragraph (g): The asterisk (or "one star") with the last three digits of the task numbers listed in paragraphs (g)(1) and (2) of this AD indicates that the task is an airworthiness limitation task. (h) No Alternative Actions or Intervals After the existing maintenance or inspection program has been revised as required by paragraph (g) of this AD, no alternative actions ( e.g., inspections) or intervals may be used unless the actions or intervals, are approved as an alternative method of compliance in accordance with the procedures specified in paragraph (i)(1) of this AD. (i) Other FAA 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 Bombardier, Inc.'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, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7300; email 9-avs-nyaco-cos@faa.gov. (k) Material Incorporated by Reference (1) The Director of the Federal Register approved the incorporation by reference 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) Task 54-51-00-111* "Discard of the Aft Engine Mount Bolts, Part No. MS21250-07, Non-Serialized," Section 5-10-10 "Life Limits (Structures)," Part 2 "Airworthiness Limitations," of the Bombardier Challenger 300 Time Limits/Maintenance Check, Publication No. CH 300 TLMC, Revision 24, dated August 9, 2023. Note 2 to paragraph (k)(2)(i): The asterisk (or "one star") with the last three digits of the task numbers listed in paragraphs (k)(2)(i) and (ii) of this AD indicates that the task is an airworthiness limitation task. (ii) Task 54-51-00-111* "Discard of the Aft Engine Mount Bolts, Part No. MS21250-07, Non-Serialized," Section 5-10-10 "Life Limits (Structures)," of Part 2 "Airworthiness Limitations," of the Bombardier Challenger 350 Time Limits/Maintenance Check, Publication No. CH 350 TLMC, Revision 14, dated August 9, 2023. (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 7, 2024. Victor Wicklund, Deputy Director, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2024-21807 Filed 9-24-24; 8:45 am]BILLING CODE 4910-13-P