# Airworthiness Directives; Bombardier, Inc. Airplanes
> **Rule** · Final rule. · Published 2015-09-29 · Effective 2015-11-03 · 80 FR 58344
## Document
- **Document number:** 2015-24252
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 80 FR 58344
- **Publication date:** 2015-09-29
- **Effective date:** 2015-11-03
- **FAA docket:** Docket No. FAA-2015-0494
## Abstract

We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model DHC-8-400 series airplanes. This AD was prompted by reports of inadvertent deployment of a single outboard spoiler during flight. This AD requires replacement of the power control units (PCUs) for the outboard spoilers with upgraded PCUs. We are issuing this AD to prevent leakage of the piston head seal and piston rod seals of the outboard spoiler PCUs, which could result in inadvertent spoiler deployment and reduced controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2015/09/29/2015-24252/airworthiness-directives-bombardier-inc-airplanes)
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