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AD 2025-20064

Published 2025-11-18 · 1 model · 387 US-registered tails affected · Federal Register

Airworthiness Directives; Bombardier, Inc., Airplanes Federal Register ↗

Abstract

The FAA is adopting a new airworthiness directive (AD) for all Bombardier, Inc., Model CL-600-2B16 (604 Variant) airplanes. This AD was prompted by reports that the flap system on-board recorder (FSOBR) interfaces with the flap control unit signals and may result in the flap control unit monitors tripping, causing Flap Fail messages and possibly an uncommanded flap movement. This AD requires the disconnection of the FSOBR and prohibits future installation of this system. The FAA is issuing this AD to address the unsafe condition on these products.

Applicability · by US fleet size

Federal Register text

Verbatim; the Federal Register publication is the legally binding document. Cite: 90 FR 51501. View on Federal Register ↗

[Federal Register Volume 90, Number 220 (Tuesday, November 18, 2025)] [Rules and Regulations] [Pages 51501-51504] From the Federal Register Online via the Government Publishing Office [www.gpo.gov] [FR Doc No: 2025-20064]

======================================================================== Rules and Regulations Federal Register ________________________________________________________________________ This section of the FEDERAL REGISTER contains regulatory documents having general applicability and legal effect, most of which are keyed to and codified in the Code of Federal Regulations, which is published under 50 titles pursuant to 44 U.S.C. 1510. The Code of Federal Regulations is sold by the Superintendent of Documents. ========================================================================

Federal Register / Vol. 90, No. 220 / Tuesday, November 18, 2025 / Rules and Regulations

[[Page 51501]]

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2025-0483; Project Identifier MCAI-2024-00523-T; Amendment 39-23182; AD 2025-22-04] RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc., Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all Bombardier, Inc., Model CL-600-2B16 (604 Variant) airplanes. This AD was prompted by reports that the flap system on-board recorder (FSOBR) interfaces with the flap control unit signals and may result in the flap control unit monitors tripping, causing Flap Fail messages and possibly an uncommanded flap movement. This AD requires the disconnection of the FSOBR and prohibits future installation of this system. The FAA is issuing this AD to address the unsafe condition on these products.

DATES: This AD is effective December 23, 2025. The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD as of December 23, 2025.