# Airworthiness Directives; Bombardier, Inc. Airplanes
> **Rule** · Final rule. · Published 2014-09-19 · Effective 2014-10-24 · 79 FR 56264
## Document
- **Document number:** 2014-22153
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 79 FR 56264
- **Publication date:** 2014-09-19
- **Effective date:** 2014-10-24
- **FAA docket:** Docket No. FAA-2014-0144
## Abstract

We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model DHC-8-400, -401, and -402 airplanes. This AD was prompted by reports of rudder bearings falling out of the fore rudder hinge bracket during assembly. This AD requires a proof load test and detailed inspections; and installation of a new bearing, reaming, or repair of the bearing if necessary. We are issuing this AD to detect and correct improper bearing installation, which could result in abnormal wear and potential increased freeplay in the rudder system, and resultant airframe vibration, leading to compromise of the flutter margins of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2014/09/19/2014-22153/airworthiness-directives-bombardier-inc-airplanes)
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