# Proposed AD FAA-2021-0183: De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-12-02
- Products: De Havilland Aircraft of Canada
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 22, 2021, 86 FR 15149
- Comments due: May 6, 2021
- Became: [AD 2021-12-02](https://openairdocs.org/ad/2021-12-02)
- Docket: FAA-2021-0183 (https://www.regulations.gov/docket/FAA-2021-0183, where comments are filed)
- Project: MCAI-2020-01408-T
- FR document: 2021-05352
- Official PDF: https://openairdocs.org/files/sha256/da/2c/da2c934d8c780bef816f1e07d739835ee5f23da240d6c0a70a56ad391b47c5c9 (from https://www.govinfo.gov/content/pkg/FR-2021-03-22/pdf/2021-05352.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/03/22/2021-05352/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2396D7F0AEC4F1B8862586A100503BE1.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0183

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain De Havilland Aircraft of Canada Limited Model DHC-8-400 series airplanes. This proposed AD was prompted by a report that a number of nacelle A-frames were not manufactured in accordance with engineering drawings. This proposed AD would require, depending on airplane configuration, removing the fasteners on the nacelle A-frame side brace sub-assemblies, doing an eddy current inspection for cracking, cold-working the holes, installing oversize fasteners, re- identifying the reworked side brace fitting and A-frame, and repair if necessary. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Mar 22, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-05352, comments due May 6, 2021 (https://www.federalregister.gov/documents/2021/03/22/2021-05352/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by)

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