# Proposed AD FAA-2025-0483: Bombardier, Inc., Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2025-22-04
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 7, 2025, 90 FR 14929
- Comments due: May 22, 2025
- Became: [AD 2025-22-04](https://openairdocs.org/ad/2025-22-04)
- Docket: FAA-2025-0483 (https://www.regulations.gov/docket/FAA-2025-0483, where comments are filed)
- Project: MCAI-2024-00523-T
- FR document: 2025-05863
- Official PDF: https://openairdocs.org/files/sha256/e4/e2/e4e2add990a2a2c436ca224399ab6431de600f2691d13f78f06896ecc3e09eb0 (from https://www.govinfo.gov/content/pkg/FR-2025-04-07/pdf/2025-05863.pdf)
- Federal Register: https://www.federalregister.gov/documents/2025/04/07/2025-05863/airworthiness-directives-bombardier-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2025-05863-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2025-0483

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Bombardier, Inc., Model CL-600-2B16 (604 Variant) airplanes. This proposed 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 proposed AD would require the disconnection of the FSOBR and prohibit future installation of this system. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Apr 7, 2025: Notice of proposed rulemaking (NPRM). (first notice), FR document 2025-05863, comments due May 22, 2025 (https://www.federalregister.gov/documents/2025/04/07/2025-05863/airworthiness-directives-bombardier-inc-airplanes)

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