# Proposed AD FAA-2015-8464: Bombardier, Inc. Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2016-22-03
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 19, 2016, 81 FR 2785
- Comments due: March 4, 2016
- Became: [AD 2016-22-03](https://openairdocs.org/ad/2016-22-03)
- Docket: FAA-2015-8464 (https://www.regulations.gov/docket/FAA-2015-8464, where comments are filed)
- Project: 2015-NM-050-AD
- FR document: 2016-00375
- Official PDF: https://openairdocs.org/files/sha256/d2/d7/d2d756cea07b9a85fa837c77546f17f66ab6acf09cf23bb9e994e73b57c229e0 (from https://www.govinfo.gov/content/pkg/FR-2016-01-19/pdf/2016-00375.pdf)
- Federal Register: https://www.federalregister.gov/documents/2016/01/19/2016-00375/airworthiness-directives-bombardier-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/075BB7F9D1E749AD86257F3F0054480D.0001
- Page: https://openairdocs.org/proposed/FAA-2015-8464

## Summary

We propose to adopt a new airworthiness directive (AD) for all Bombardier, Inc. Model DHC-8-400 series airplanes. This proposed 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 proposed AD would require revising the airplane maintenance program or inspection program, as applicable, to incorporate a new CMR task. We are proposing 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.

## Notices in this docket

- Jan 19, 2016: Notice of proposed rulemaking (NPRM). (first notice), FR document 2016-00375, comments due Mar 4, 2016 (https://www.federalregister.gov/documents/2016/01/19/2016-00375/airworthiness-directives-bombardier-inc-airplanes)

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