# Proposed AD FAA-2013-0689: Bombardier, Inc. Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2014-05-18
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 13, 2013, 78 FR 49240
- Comments due: September 27, 2013
- Became: [AD 2014-05-18](https://openairdocs.org/ad/2014-05-18)
- Docket: FAA-2013-0689 (https://www.regulations.gov/docket/FAA-2013-0689, where comments are filed)
- Project: 2012-NM-225-AD
- FR document: 2013-19529
- Official PDF: https://openairdocs.org/files/sha256/a0/60/a0600486a9cd53e52b9fea974132d3fab84be2726bb13cd1d6c63b1d2a1e076a (from https://www.govinfo.gov/content/pkg/FR-2013-08-13/pdf/2013-19529.pdf)
- Federal Register: https://www.federalregister.gov/documents/2013/08/13/2013-19529/airworthiness-directives-bombardier-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8276546167D7685686257BC600531A3A.0001
- Page: https://openairdocs.org/proposed/FAA-2013-0689

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Bombardier, Inc. Model DHC-8-400 series airplanes. This proposed AD was prompted by a report that a batch of main landing gear (MLG) door actuators with a certain part number having certain serial numbers could be assembled with the scraper installed backward. This proposed AD would require repetitive functional checks of the MLG alternate extension system (AES) and eventual replacement of certain MLG door actuators with actuators that have either been reworked or do not have certain serial numbers. We are proposing this AD to prevent incorrectly installed scrapers, which could hinder the operation of the MLG AES, and result in failure of the MLG AES on one side, and consequent unsafe asymmetrical landing configuration.

## Notices in this docket

- Aug 13, 2013: Notice of proposed rulemaking (NPRM). (first notice), FR document 2013-19529, comments due Sep 27, 2013 (https://www.federalregister.gov/documents/2013/08/13/2013-19529/airworthiness-directives-bombardier-inc-airplanes)

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