# Airworthiness Directives; Bombardier, Inc., Airplanes
> **Rule** · Final rule. · Published 2021-02-24 · Effective 2021-03-31 · 86 FR 11108
## Document
- **Document number:** 2021-03600
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 11108
- **Publication date:** 2021-02-24
- **Effective date:** 2021-03-31
- **FAA docket:** Docket No. FAA-2020-0859
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Bombardier, Inc., Model BD-100-1A10 airplanes. This AD was prompted by reports of failure of a certain fire detection and extinguishing (FIREX) control unit. This AD requires replacing FIREX control units having a certain part number. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/02/24/2021-03600/airworthiness-directives-bombardier-inc-airplanes)
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