2025-19-01: Autoflight

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: a. Removing Airworthiness Directive (AD) 2022-25-51, Amendment 39-22282 (87 FR 75911, December 12, 2022); and b. Adding the following new AD: 2025-19-01 Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.): Amendment 39-23141; Docket No. FAA-2025-0344; Project Identifier MCAI-2024-00638-T. (a) Effective Date This airworthiness directive (AD) is effective October 23, 2025. (b) Affected ADs This AD replaces AD 2022-25-51, Amendment 39-22282 (87 FR 75911, December 12, 2022) (AD 2022-25-51). (c) Applicability This AD applies to Airbus Canada Limited Partnership (type certificate previously held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Model BD-500-1A10 and Model BD-500-1A11 airplanes, certificated in any category, as identified in Transport Canada AD CF-2024-36, dated October 22, 2024 (Transport Canada AD CF-2024-36). (d) Subject Air Transport Association (ATA) of America Code 22, Autoflight. (e) Unsafe Condition This AD was prompted by multiple in-service reports associated with primary flight control computer (PFCC) software deficiencies leading to nuisance messages on the engine-indicating and crew-alerting system (EICAS) due to erroneous transmissions from the remote electronic unit (REU). Investigations also indicated design deficiencies in the PFCC software and a lack of software robustness, which may not prevent an un-annunciated deployment of ground spoilers or an inadvertent autopilot engagement during the take-off roll. The FAA is issuing this AD to address the PFCC software deficiencies leading to nuisance messages and the lack of PFCC software robustness. The unsafe condition, if not addressed, could lead to increased flightcrew workload as well as a large reduction of safety margins. Additionally, during specific flight phases or in combination with other failures, these conditions could lead to loss of control of the airplane. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Retained Revision of Existing AFM, With No Changes This paragraph restates the requirements of paragraph (g) of AD 2022-25-51, with no changes. Within 7 days after December 27, 2022 (the effective date of AD 2022-25-51), revise the Limitations section of the existing airplane flight manual (AFM) to include the information specified in figure 1 to paragraph (g) of this AD. This may be accomplished by inserting a copy of figure 1 to paragraph (g) of this AD into the existing AFM. Using an AFM revision that includes information identical to that in figure 1 to paragraph (g) of this AD is acceptable for compliance with the requirement of this paragraph. Figure 1 to Paragraph (g)-Autopilot and Autothrottle Engagement Limitation ER18SE25.010 (h) New Requirements of This AD Except as specified in paragraph (i) of this AD: Comply with all required actions and compliance times specified in, and in accordance with, Transport Canada AD CF-2024-36. Accomplishing the software installation required by paragraph A. of Part II of Transport Canada AD CF-2024-36 terminates the AFM revision required by paragraph (g) of this AD. (i) Exceptions to Transport Canada AD CF-2024-36 (1) This AD does not adopt the requirements of Part I of Transport Canada AD CF-2024-36. (2) Where Transport Canada AD CF-2024-36 refers to its effective date, this AD requires using the effective date of this AD. (3) For the airplanes identified in the "Concurrent requirements" paragraph of the material referenced in Transport Canada AD CF-2024-36: At the applicable time specified in paragraph (i)(3)(i) or (ii) of this AD, accomplish the concurrent PFCC software update specified in the material referenced in Transport Canada AD CF-2024-36. (i) For airplanes identified in AD 2023-12-09, Amendment 39-22467 (88 FR 42606, July 3, 2023) (AD 2023-12-09): Prior to or concurrently with the installation specified in paragraph A. of Part II of Transport Canada AD CF-2024-36 but no later than the compliance time specified in AD 2023-12-09. (ii) For airplanes not identified in AD 2023-12-09: Prior to or concurrently with the installation specified in paragraph A. of Part II of Transport Canada AD CF-2024-36. (j) Additional AD Provisions The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, AIR-520, Continued Operational Safety 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 Continued Operational Safety Branch, send it to the attention of the person identified in paragraph (k) 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, AIR-520, Continued Operational Safety Branch, FAA; or Transport Canada; or Airbus Canada Limited Partnership'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 Rochelle Montgomery, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 405-798-2043; 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) Transport Canada AD CF-2024-36, dated October 22, 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/ibr-locations, or email [email protected] . Issued on September 15, 2025. Peter A. White, Deputy Director, Integrated Certificate Management Division, Aircraft Certification Service. [FR Doc. 2025-18088 Filed 9-17-25; 8:45 am]BILLING CODE 4910-13-P