2025-13-04: Flight Controls

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: 2025-13-04 MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier Inc.): Amendment 39-23070; Docket No. FAA-2025-0619; Project Identifier MCAI-2024-00372-T. (a) Effective Date This airworthiness directive (AD) is effective August 5, 2025. (b) Affected ADs None. (c) Applicability This AD applies to all MHI RJ Aviation ULC (Type Certificate previously held by Bombardier Inc.) airplanes identified in paragraphs (c)(1) through (5) of this AD, certificated in any category. (1) Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplanes. (2) Model CL-600-2C11 (Regional Jet Series 550) airplanes. (3) Model CL-600-2D15 (Regional Jet Series 705) airplanes. (4) Model CL-600-2D24 (Regional Jet Series 900) airplanes. (5) Model CL-600-2E25 (Regional Jet Series 1000) airplanes. (d) Subject Air Transport Association (ATA) of America Code 27, Flight Controls. (e) Unsafe Condition This AD was prompted by a report of an in-service event where an engine indicating and crew alerting system STAB TRIM Caution message was posted, and subsequent repair found prematurely worn teeth on a rubber bull gear (RBG) wheel in the horizontal stabilizer trim actuator. The FAA is issuing this AD to address premature wear of the RBG wheel teeth. The unsafe condition, if not addressed, could result in a failure of the horizontal stabilizer trim system. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Requirements Except as specified in paragraphs (h) and (i) of this AD: Comply with all required actions and compliance times specified in, and in accordance with, Transport Canada AD CF-2024-25, dated June 28, 2024 (Transport Canada AD CF-2024-25). (h) Exceptions to Transport Canada AD CF-2024-25 (1) Where Transport Canada AD CF-2024-25 refers to its effective date, this AD requires using the effective date of this AD. (2) Where Transport Canada AD CF-2024-25 refers to "Section 1.A. of the applicable MHIRJ SB", this AD requires replacing that text with "Section 1.A. of MHIRJ Service Bulletin 670BA-27-077, dated April 16, 2024". (i) 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 (j) of this AD and email 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 MHI RJ'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 Isabel Saltzman, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: 516-228-7300; email: [email protected]. (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) Transport Canada AD CF-2024-25, dated June 28, 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 [email protected]. 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/[email protected]. Issued on June 18, 2025. Steven W. Thompson, Acting Deputy Director, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2025-12245 Filed 6-30-25; 8:45 am]BILLING CODE 4910-13-P