# Airworthiness Directives; Bombardier, Inc., Airplanes
> **Rule** · Final rule. · Published 2017-10-02 · Effective 2017-11-06 · 82 FR 45703
## Document
- **Document number:** 2017-20824
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 82 FR 45703
- **Publication date:** 2017-10-02
- **Effective date:** 2017-11-06
- **FAA docket:** Docket No. FAA-2017-0518
## Abstract

We are adopting 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 (FCA), which was likely caused by an electrical short in a discharged squib for a fire extinguishing bottle. This AD requires replacing certain circuit breakers. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2017/10/02/2017-20824/airworthiness-directives-bombardier-inc-airplanes)
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