# Proposed AD FAA-2026-4642: Bombardier, Inc., Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Comment period closed
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 26, 2026, 91 FR 30516
- Comments due: July 10, 2026
- Docket: FAA-2026-4642 (https://www.regulations.gov/docket/FAA-2026-4642, where comments are filed)
- Project: MCAI-2024-00705-T
- FR document: 2026-10382
- Official PDF: https://openairdocs.org/files/sha256/6a/4a/6a4a5946659d4ee95c3e52db63095948f6afa38b429d24a6cf9524941c6ba8d1 (from https://www.govinfo.gov/content/pkg/FR-2026-05-26/pdf/2026-10382.pdf)
- Federal Register: https://www.federalregister.gov/documents/2026/05/26/2026-10382/airworthiness-directives-bombardier-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-10382-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2026-4642

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Bombardier, Inc., Model CL-600-1A11 (600), CL-600-2A12 (601), and CL-600-2B16 (601-3A, 601-3R, and 604 Variants) airplanes. This proposed AD was prompted by an in-flight uncommanded, unarrested flaps movement accompanied by a FLAPS FAIL caution message. This proposed AD would require revising the existing aircraft flight manual (AFM) to provide the flightcrew with procedures to follow in the event of an uncommanded, unarrested flap movement. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- May 26, 2026: Notice of proposed rulemaking (NPRM). (first notice), FR document 2026-10382, comments due Jul 10, 2026 (https://www.federalregister.gov/documents/2026/05/26/2026-10382/airworthiness-directives-bombardier-inc-airplanes)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.