# Proposed AD FAA-2012-0724: Bombardier, Inc. Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-20-09
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 25, 2012, 77 FR 43545
- Comments due: September 10, 2012
- Became: [AD 2012-20-09](https://openairdocs.org/ad/2012-20-09)
- Docket: FAA-2012-0724 (https://www.regulations.gov/docket/FAA-2012-0724, where comments are filed)
- Project: 2012-NM-043-AD
- FR document: 2012-18145
- Official PDF: https://openairdocs.org/files/sha256/8d/00/8d0059b7026b083a000e5b4897c8ca92f90dd638720168b06df39d8f7829ab51 (from https://www.govinfo.gov/content/pkg/FR-2012-07-25/pdf/2012-18145.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/07/25/2012-18145/airworthiness-directives-bombardier-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2AE595CD9650423C86257A4600466630.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0724

## Summary

We propose to supersede an existing airworthiness directive (AD) that applies to certain Bombardier, Inc. Model DHC-8-400 series airplanes. The existing AD currently requires a modification to trim the edge of the bumper plate, including performing an inspection for damage or cracks of the bumper plate and base fitting, and replacing any damaged or cracked part. That AD also currently requires, for certain airplanes, reidentifying the bumper plate. Since we issued that AD, we have determined that an operational check must be done after reidentifying the bumper plate to ensure the identified unsafe condition is addressed. This proposed AD would require, for airplanes on which the reidentification is done, an operational check of the alternate extension system of the main landing gear (MLG), and repair if necessary. We are proposing this AD to detect and correct failure of the MLG to extend and lock, which could adversely affect the safe landing of the airplane.

## Notices in this docket

- Jul 25, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-18145, comments due Sep 10, 2012 (https://www.federalregister.gov/documents/2012/07/25/2012-18145/airworthiness-directives-bombardier-inc-airplanes)

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