# Proposed AD FAA-2021-0694: De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2022-03-02
- Products: De Havilland Aircraft of Canada
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 24, 2021, 86 FR 47258
- Comments due: October 8, 2021
- Became: [AD 2022-03-02](https://openairdocs.org/ad/2022-03-02)
- Docket: FAA-2021-0694 (https://www.regulations.gov/docket/FAA-2021-0694, where comments are filed)
- Project: MCAI-2021-00305-T
- FR document: 2021-18111
- Official PDF: https://openairdocs.org/files/sha256/01/66/01669b2d416c6af2a7f25f38a6546463599badf7c8ee54bdb0f0b24f84279e5a (from https://www.govinfo.gov/content/pkg/FR-2021-08-24/pdf/2021-18111.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/08/24/2021-18111/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/40F52029CFFE23248625873C004C4974.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0694

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for De Havilland Aircraft of Canada Limited Model DHC-8-401 and -402 airplanes. This proposed AD was prompted by reports of a possible hard contact between the #2 top high level sensor (HLS) terminal screw head and the #6 outer wing fuel access panel stiffener flange. This proposed AD would require removing and replacing or reworking the #6 outer wing fuel access panel assembly. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Aug 24, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-18111, comments due Oct 8, 2021 (https://www.federalregister.gov/documents/2021/08/24/2021-18111/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by)

---
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.