# Proposed AD FAA-2022-1653: De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2023-05-01
- Products: De Havilland Aircraft of Canada
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 23, 2022, 87 FR 78881
- Comments due: February 6, 2023
- Became: [AD 2023-05-01](https://openairdocs.org/ad/2023-05-01)
- Docket: FAA-2022-1653 (https://www.regulations.gov/docket/FAA-2022-1653, where comments are filed)
- Project: MCAI-2022-01193-T
- FR document: 2022-27876
- Official PDF: https://openairdocs.org/files/sha256/9c/47/9c47f886a7424b5e4b44dd581cf6ae6ff7e40ac04b711e6a801e5e38388e6f5b (from https://www.govinfo.gov/content/pkg/FR-2022-12-23/pdf/2022-27876.pdf)
- Federal Register: https://www.federalregister.gov/documents/2022/12/23/2022-27876/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2022-27876-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2022-1653

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain De Havilland Aircraft of Canada Limited Model DHC-8-400 series airplanes. This proposed AD was prompted by reports of flap power unit (FPU) pressure switch failures resulting in flap inoperative events. This proposed AD would require replacing the FPU pressure switch or the FPU. This proposed AD would also prohibit the installation of affected parts. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Dec 23, 2022: Notice of proposed rulemaking (NPRM). (first notice), FR document 2022-27876, comments due Feb 6, 2023 (https://www.federalregister.gov/documents/2022/12/23/2022-27876/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by)

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