# Proposed AD FAA-2024-1692: De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2024-22-07
- Products: De Havilland Aircraft of Canada
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 21, 2024, 89 FR 51988
- Comments due: August 5, 2024
- Became: [AD 2024-22-07](https://openairdocs.org/ad/2024-22-07)
- Docket: FAA-2024-1692 (https://www.regulations.gov/docket/FAA-2024-1692, where comments are filed)
- Project: MCAI-2024-00050-T
- FR document: 2024-13559
- Official PDF: https://openairdocs.org/files/sha256/17/aa/17aadd2636e8df49787389dea183cec76add7f2d2bee1737e3f217782e8e613f (from https://www.govinfo.gov/content/pkg/FR-2024-06-21/pdf/2024-13559.pdf)
- Federal Register: https://www.federalregister.gov/documents/2024/06/21/2024-13559/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2024-13559-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2024-1692

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain De Havilland Aircraft of Canada Limited Model DHC-8-401 and -402 airplanes. This proposed AD was prompted by a report of an in- flight event where isolation valve caution messages were received. This proposed AD would require inspecting the fuse/shuttle valve serial numbers, and replacing certain fuse/shuttle valves, as specified in a Transport Canada AD, which is proposed for incorporation by reference (IBR). The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jun 21, 2024: Notice of proposed rulemaking (NPRM). (first notice), FR document 2024-13559, comments due Aug 5, 2024 (https://www.federalregister.gov/documents/2024/06/21/2024-13559/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by)

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