# Proposed AD FAA-2021-0312: De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-19-11
- Products: De Havilland Aircraft of Canada
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 20, 2021, 86 FR 20459
- Comments due: June 4, 2021
- Became: [AD 2021-19-11](https://openairdocs.org/ad/2021-19-11)
- Docket: FAA-2021-0312 (https://www.regulations.gov/docket/FAA-2021-0312, where comments are filed)
- Project: MCAI-2020-01376-T
- FR document: 2021-07985
- Official PDF: https://openairdocs.org/files/sha256/c4/c5/c4c526c3cefd15bbaa1eee9ac4df2e06cbb098180d125246fdbdfc836136e0b6 (from https://www.govinfo.gov/content/pkg/FR-2021-04-20/pdf/2021-07985.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/04/20/2021-07985/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F27F49FC858B1E8C862586BD007B7938.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0312

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain De Havilland Aircraft of Canada Limited Model DHC-8-102, - 103, and -106 airplanes; Model DHC-8-201 and -202 airplanes; Model DHC- 8-301, -311, and -315 airplanes; and Model DHC-8-400, -401, and -402 airplanes. This proposed AD was prompted by reports that mounting nuts attaching the rudder actuator bracket to the vertical stabilizer have been found cracked or missing due to hydrogen embrittlement. This proposed AD would require a one-time inspection of the rudder actuator bracket mounting nuts, and corrective actions if necessary. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Apr 20, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-07985, comments due Jun 4, 2021 (https://www.federalregister.gov/documents/2021/04/20/2021-07985/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.