# Proposed AD FAA-2021-0018: De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-10-13
- Products: De Havilland Aircraft of Canada
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 24, 2021, 86 FR 11175
- Comments due: April 12, 2021
- Became: [AD 2021-10-13](https://openairdocs.org/ad/2021-10-13)
- Docket: FAA-2021-0018 (https://www.regulations.gov/docket/FAA-2021-0018, where comments are filed)
- Project: MCAI-2020-01214-T
- FR document: 2021-03597
- Official PDF: https://openairdocs.org/files/sha256/f4/f8/f4f8a6d030ad89f2cc6dfaaaba1cc637103b4ddca87b94f89da0aba1088ea614 (from https://www.govinfo.gov/content/pkg/FR-2021-02-24/pdf/2021-03597.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/02/24/2021-03597/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6F472DE6F06CB9CA862586860063878D.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0018

## Summary

The FAA proposes to supersede Airworthiness Directive (AD) 2015-17-08, which applies to certain Bombardier, Inc. Model DHC-8-400 series airplanes. AD 2015-17-08 requires installing new cable assemblies with a pull-down resistor. Since the FAA issued AD 2015-17- 08, a modification has been developed to address all known single point failures that could lead to runaway of the nose wheel steering (NWS) system. This proposed AD would require modifications to the NWS system. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Feb 24, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-03597, comments due Apr 12, 2021 (https://www.federalregister.gov/documents/2021/02/24/2021-03597/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by)

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