# Airworthiness Directives; Bombardier, Inc. Airplanes
> **Rule** · Final rule. · Published 2016-10-26 · Effective 2016-11-30 · 81 FR 74287
## Document
- **Document number:** 2016-25747
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 81 FR 74287
- **Publication date:** 2016-10-26
- **Effective date:** 2016-11-30
- **FAA docket:** Docket No. FAA-2015-8464
## Abstract

We are adopting a new airworthiness directive (AD) for all Bombardier, Inc. Model DHC-8-400 series airplanes. This AD was prompted by a revision by the manufacturer to the Certification Maintenance Requirements (CMR) of the Airworthiness Limitation Items (ALI), in the Maintenance Requirement Manual (MRM), that introduces a new CMR task that requires repetitive operational checks of the propeller overspeed governor. This AD requires revising the airplane maintenance or inspection program, as applicable, to incorporate a new CMR task. We are issuing this AD to prevent dormant failure of the propeller overspeed governor, which may lead to a loss of propeller overspeed protection and result in high propeller drag in flight.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2016/10/26/2016-25747/airworthiness-directives-bombardier-inc-airplanes)
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