2025-05-06: Nacelles/pylons

1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(f), 40113, 44701. 2. The FAA amends § 39.13 by: a. Removing Airworthiness Directive (AD) 2022-01-02, Amendment 39-21890 (87 FR 4145, January 27, 2022); and b. Adding the following new AD: 2025-05-06 De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.): Amendment 39-22978; Docket No. FAA-2024-2420; Project Identifier MCAI-2024-00143-T. (a) Effective Date This airworthiness directive (AD) is effective April 18, 3036. (b) Affected ADs This AD replaces AD 2022-01-02, Amendment 39-21890 (87 FR 4145, January 27, 2022) (AD 2022-01-02). (c) Applicability This AD applies to De Havilland Aircraft of Canada Limited (type certificate previously held by Bombardier, Inc.) Model DHC-8-401 and -402 airplanes, certificated in any category, as identified in Transport Canada AD CF-2020-51R2, dated February 27, 2024 (Transport Canada AD CF-2020-51R2). (d) Subject Air Transport Association (ATA) of America Code 54, Nacelles/pylons. (e) Unsafe Condition This AD was prompted by a report that the epoxy primer on the internal bore of the nacelle and landing gear attachment pins was not applied, and by corrosion found on the internal bore of the wing rear spar attachment pins. The FAA is issuing this AD to address premature corrosion and subsequent failure of the nacelle to landing gear and nacelle to rear wing spar attachment pins. The unsafe condition, if not addressed, could result a single or dual collapse of the main landing gear. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Required Actions 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-2020-51R2. (h) Exceptions to Transport Canada AD CF-2020-51R2 (1) Where Transport Canada AD CF-2020-51R2 refers to "the effective date of AD CF-2020-51, 9 December 2020," this AD requires using March 3, 2022 (the effective date of AD 2022-01-02). (2) Where paragraph A. of Parts I, II, and III, and Parts IV and V, of Transport Canada AD CF-2020-51R2 specifies the compliance time, for this AD, the compliance time for paragraph A. of Parts I, II, and III, and for Parts IV and V, of Transport Canada AD CF-2020-51R2 is at the later of the times in paragraphs (h)(2)(i) and (ii) of this AD. (i) Prior to the pins reaching 14 years from their entry-into-service or prior to the pins reaching 30,000 total flight cycles, whichever occurs first. (ii) Within 30 days after the effective date of this AD. (i) Additional AD Provisions (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 AMOC@faa.gov. (i) Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the responsible Flight Standards Office. (ii) AMOCs approved previously for AD 2022-01-02 are approved as AMOCs for the corresponding provisions of Transport Canada AD CF-2020-51R2 that are required by paragraph (g) of this AD. (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 De Havilland Aircraft of Canada Limited'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 Fatin Saumik, 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 (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-2020-51R2, dated February 27, 2024. (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 TC.AirworthinessDirectives-Consignesdenavigabilite.TC@tc.gc.ca. You may find this 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 fr.inspection@nara.gov. Issued on February 28, 2025. Steven W. Thompson, Acting Deputy Director, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2025-03880 Filed 3-11-25; 8:45 am]BILLING CODE 4910-13-P