# Proposed AD FAA-2021-0613: De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-23-03
- Products: De Havilland Aircraft of Canada
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 3, 2021, 86 FR 41794
- Comments due: September 17, 2021
- Became: [AD 2021-23-03](https://openairdocs.org/ad/2021-23-03)
- Docket: FAA-2021-0613 (https://www.regulations.gov/docket/FAA-2021-0613, where comments are filed)
- Project: MCAI-2020-01431-T
- FR document: 2021-16431
- Official PDF: https://openairdocs.org/files/sha256/d3/05/d305ea31038aef263c7bea5ca1f45627fc4354990808a997e1a58bad0b5706c0 (from https://www.govinfo.gov/content/pkg/FR-2021-08-03/pdf/2021-16431.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/08/03/2021-16431/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0A54305E12897063862587260076E3C4.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0613

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain De Havilland Aircraft of Canada Limited Model DHC-8-400, - 401, and -402 airplanes. This proposed AD was prompted by a report of cracking found on a main landing gear (MLG) drag strut assembly. This proposed AD would require a records review to determine if an affected MLG drag strut assembly is installed, repetitive detailed inspections for cracking of affected strut assemblies, a one-time magnetic particle inspection for cracking, and on-condition actions if necessary. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Aug 3, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-16431, comments due Sep 17, 2021 (https://www.federalregister.gov/documents/2021/08/03/2021-16431/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.