# Proposed AD FAA-2013-1025: Bombardier, Inc. Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2014-13-18
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 11, 2013, 78 FR 75291
- Comments due: January 27, 2014
- Became: [AD 2014-13-18](https://openairdocs.org/ad/2014-13-18)
- Docket: FAA-2013-1025 (https://www.regulations.gov/docket/FAA-2013-1025, where comments are filed)
- Project: 2013-NM-096-AD
- FR document: 2013-29513
- Official PDF: https://openairdocs.org/files/sha256/cc/0c/cc0c648a2a5917e2cba11f9f2646dcbd1e39d988ec2fc8fbd441d8192de6d53c (from https://www.govinfo.gov/content/pkg/FR-2013-12-11/pdf/2013-29513.pdf)
- Federal Register: https://www.federalregister.gov/documents/2013/12/11/2013-29513/airworthiness-directives-bombardier-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/05BC18346FEF793186257C3E0048ED0C.0001
- Page: https://openairdocs.org/proposed/FAA-2013-1025

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Bombardier, Inc., Model DHC-8-102, -103, and -106 airplanes; and DHC-8-200 and DHC-8-300 series airplanes. This proposed AD was prompted by a report of a beta warning horn (BWH) system failing to activate when the beta mode was triggered. This proposed AD would require modifying the BWH microswitch installation. We are proposing this AD to prevent the inadvertent activation of ground beta mode during flight, which could lead to engine overspeed, engine damage or failure, and consequent reduced controllability of the airplane.

## Notices in this docket

- Dec 11, 2013: Notice of proposed rulemaking (NPRM). (first notice), FR document 2013-29513, comments due Jan 27, 2014 (https://www.federalregister.gov/documents/2013/12/11/2013-29513/airworthiness-directives-bombardier-inc-airplanes)

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