# Airworthiness Directives; Bombardier, Inc., Airplanes
> **Rule** · Final rule. · Published 2025-02-10 · Effective 2025-03-17 · 90 FR 9207
## Document
- **Document number:** 2025-02397
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 90 FR 9207
- **Publication date:** 2025-02-10
- **Effective date:** 2025-03-17
- **FAA docket:** Docket No. FAA-2024-2023
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Bombardier, Inc., Model BD-100-1A10 airplanes. This AD was prompted by uncommanded horizontal stabilizer motion during several in- service events caused by a problem with the trim switch wiring. This AD requires installing the pitch/roll trim switch relays. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/02/10/2025-02397/airworthiness-directives-bombardier-inc-airplanes)
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