# Proposed AD FAA-2021-1068: De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2022-06-15
- Products: De Havilland Aircraft of Canada
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 17, 2021, 86 FR 71594
- Comments due: January 31, 2022
- Became: [AD 2022-06-15](https://openairdocs.org/ad/2022-06-15)
- Docket: FAA-2021-1068 (https://www.regulations.gov/docket/FAA-2021-1068, where comments are filed)
- Project: MCAI-2021-00383-T
- FR document: 2021-27295
- Official PDF: https://openairdocs.org/files/sha256/b8/12/b81277e4fbf770e112cd5874a327aee0a13dfe1cc7109b5ec8f692130afb863e (from https://www.govinfo.gov/content/pkg/FR-2021-12-17/pdf/2021-27295.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/12/17/2021-27295/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2021-27295-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2021-1068

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all De Havilland Aircraft of Canada Limited Model DHC-8-401 and -402 airplanes. This proposed AD was prompted by reports of bleed air leaks in the wing box area and failure of the leak detection shroud. This proposed AD would require removing and inspecting the affected V-band coupling and check valve seals, doing corrective actions if necessary, and replacing the coupling and seals with a redesigned assembly. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Dec 17, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-27295, comments due Jan 31, 2022 (https://www.federalregister.gov/documents/2021/12/17/2021-27295/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by)

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