# Proposed AD FAA-2020-0099: De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2020-11-13
- Products: De Havilland Aircraft of Canada
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 12, 2020, 85 FR 14423
- Comments due: April 27, 2020
- Became: [AD 2020-11-13](https://openairdocs.org/ad/2020-11-13)
- Docket: FAA-2020-0099 (https://www.regulations.gov/docket/FAA-2020-0099, where comments are filed)
- FR document: 2020-03271
- Official PDF: https://openairdocs.org/files/sha256/9f/28/9f28e89aebceb81547a42e0b2595820f4f4b49ab941c2ed2b6af03ee2e259eb9 (from https://www.govinfo.gov/content/pkg/FR-2020-03-12/pdf/2020-03271.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/03/12/2020-03271/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D55C3DDA8432CD7586258535004264EA.0001
- Page: https://openairdocs.org/proposed/FAA-2020-0099

## Summary

The FAA proposes to supersede Airworthiness Directive (AD) 2010-23-04, which applies to all De Havilland Aircraft of Canada Limited Model DHC-8-400 series airplanes. AD 2010-23-04 requires repetitive detailed inspections of the nacelle attachment fittings for cracks, a conductivity inspection of the nacelle attachment fittings, and replacement if necessary. Since AD 2010-23-04 was issued, the FAA has determined that it is necessary to do a replacement with new nacelle attachment fittings. This proposed AD would retain the requirements of AD 2010-23-04, remove a certain inspection requirement for certain airplanes, and add a new requirement to replace the rear spar fitting and nacelle attaching structure with a new nacelle attachment fitting. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Mar 12, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-03271, comments due Apr 27, 2020 (https://www.federalregister.gov/documents/2020/03/12/2020-03271/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by)

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