# Proposed AD FAA-2017-0518: Bombardier, Inc., Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2017-20-07
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 2, 2017, 82 FR 25554
- Comments due: July 17, 2017
- Became: [AD 2017-20-07](https://openairdocs.org/ad/2017-20-07)
- Docket: FAA-2017-0518 (https://www.regulations.gov/docket/FAA-2017-0518, where comments are filed)
- Project: 2016-NM-167-AD
- FR document: 2017-10981
- Official PDF: https://openairdocs.org/files/sha256/62/ed/62ed749cb6307d9595c1f521bb1c7578b8bdf15fdf81c4a365304229185a203d (from https://www.govinfo.gov/content/pkg/FR-2017-06-02/pdf/2017-10981.pdf)
- Federal Register: https://www.federalregister.gov/documents/2017/06/02/2017-10981/airworthiness-directives-bombardier-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FAA4D4CA13E11F2B862581330051418C.0001
- Page: https://openairdocs.org/proposed/FAA-2017-0518

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Bombardier, Inc., Model DHC-8-400 series airplanes. This AD was prompted by the failure of the fire control amplifier, which was likely caused by an electrical short in a discharged squib for a fire extinguishing bottle. This proposed AD would require replacing certain circuit breakers. We are proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jun 2, 2017: Notice of proposed rulemaking (NPRM). (first notice), FR document 2017-10981, comments due Jul 17, 2017 (https://www.federalregister.gov/documents/2017/06/02/2017-10981/airworthiness-directives-bombardier-inc-airplanes)

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