# Proposed AD FAA-2023-0933: De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2024-02-02
- Products: De Havilland Aircraft of Canada
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 19, 2023, 88 FR 24144
- Comments due: June 5, 2023
- Became: [AD 2024-02-02](https://openairdocs.org/ad/2024-02-02)
- Docket: FAA-2023-0933 (https://www.regulations.gov/docket/FAA-2023-0933, where comments are filed)
- Project: MCAI-2022-00554-T
- FR document: 2023-08202
- Official PDF: https://openairdocs.org/files/sha256/17/5b/175b83e14152c266ea1852e1f4853b0dea3c518ef369df73e85cd17b25014504 (from https://www.govinfo.gov/content/pkg/FR-2023-04-19/pdf/2023-08202.pdf)
- Federal Register: https://www.federalregister.gov/documents/2023/04/19/2023-08202/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2023-08202-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2023-0933

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain De Havilland Aircraft of Canada Limited Model DHC-8-401 and -402 airplanes. This proposed AD was prompted by reports that the saddle washer (radius filler) for the front and rear spar joints may have been incorrectly manufactured for several years. This proposed AD would require inspecting the horizontal stabilizer to vertical joint for gaps and bending of the saddle washer and adjacent washers, and replacing parts if necessary. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Apr 19, 2023: Notice of proposed rulemaking (NPRM). (first notice), FR document 2023-08202, comments due Jun 5, 2023 (https://www.federalregister.gov/documents/2023/04/19/2023-08202/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by)

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