2025-18-10: Engine Fuel/Oil Cooler

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: 2025-18-10 Bell Textron Canada Limited: Amendment 39-23137; Docket No. FAA-2025-2276; Project Identifier MCAI-2025-00699-R. (a) Effective Date This airworthiness directive (AD) is effective September 25, 2025. (b) Affected ADs None. (c) Applicability This AD applies to Bell Textron Canada Limited Model 505 helicopters, serial numbers 65011 through 65020 inclusive and 65022 through 65027 inclusive, certificated in any category. (d) Subject Joint Aircraft System Component (JASC) Code 7311, Engine Fuel/Oil Cooler. (e) Unsafe Condition This AD was prompted by a report of a cracked mounting bracket on the oil cooler fan assembly housing. The FAA is issuing this AD to prevent cracking on the mounting bracket of the oil cooler fan assembly housing. The unsafe condition, if not addressed, could lead to failure of the drive shaft and loss of the tail rotor drive with consequent loss of control of the helicopter. (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-2025-23, dated April 23, 2025 (Transport Canada AD CF-2025-23). (h) Exceptions to Transport Canada AD CF-2025-23 (1) Where Transport Canada AD CF-2025-23 refers to its effective date, this AD requires using the effective date of this AD. (2) Where Transport Canada AD CF-2025-23 requires compliance in terms of air time, this AD requires using hours time-in-service. (3) Where Transport Canada AD CF-2025-23 specifies "Within 25 hours air time or 30 days from the effective date of this AD", this AD requires replacing that text with "Within 25 hours time-in-service or 30 days from the effective date of this AD, whichever occurs first". (4) Where paragraph 1. of Transport Canada AD CF-2025-23 specifies "conduct a visual inspection of the right bracket of the oil cooler blower housing", this AD requires replacing that text with "conduct a visual inspection and, if applicable, a gap measurement of the right bracket of the oil cooler blower housing". (i) Alternative Methods of Compliance (AMOCs) (1) 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 local Flight Standards District 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 (j) of this AD and email to: AMOC@faa.gov. (2) Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local Flight Standards District Office/certificate holding district office. (j) Additional Information For more information about this AD, contact Steven Warwick, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: (817) 222-5225; email: steven.r.warwick@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 the AD specifies otherwise. (i) Transport Canada AD CF-2025-23, dated April 23, 2025. (ii) [Reserved] (3) For Transport Canada material identified in this AD, contact Transport Canada National Aircraft Certification, 159 Cleopatra Drive, Nepean, Ontario K1A 0N5, Canada; phone: (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, Office of the Regional Counsel, Southwest Region, 10101 Hillwood Parkway, Room 6N-321, Fort Worth, TX 76177. For information on the availability of this material at the FAA, call (817) 222-5110. (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 September 5, 2025. Steven W. Thompson, Acting Deputy Director, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2025-17384 Filed 9-8-25; 11:15 am]BILLING CODE 4910-13-P