# Proposed AD FAA-2011-0381: Bombardier, Inc. Model DHC-8-400 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-18-17
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 19, 2011, 76 FR 21820
- Comments due: June 3, 2011
- Became: [AD 2011-18-17](https://openairdocs.org/ad/2011-18-17)
- Docket: FAA-2011-0381 (https://www.regulations.gov/docket/FAA-2011-0381, where comments are filed)
- Project: 2010-NM-203-AD
- FR document: 2011-9408
- Official PDF: https://openairdocs.org/files/sha256/22/0f/220ff932589d9fee1fe85d11202c53e28a2bf0be0177deec63ca69fc347764c7 (from https://www.govinfo.gov/content/pkg/FR-2011-04-19/pdf/2011-9408.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/04/19/2011-9408/airworthiness-directives-bombardier-inc-model-dhc-8-400-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C31180370BEE1D808625787700497144.0001
- Page: https://openairdocs.org/proposed/FAA-2011-0381

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

Several reports have been received on failures of the main landing gear (MLG) stabilizer extension springs. A landing gear audit has confirmed that the MLG may not lock in the down-lock position with the absence of both MLG stabilizer extension springs. The loss of the locking mechanism could result in the collapse of the main landing gear.

* * * * *

The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Apr 19, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-9408, comments due Jun 3, 2011 (https://www.federalregister.gov/documents/2011/04/19/2011-9408/airworthiness-directives-bombardier-inc-model-dhc-8-400-series-airplanes)

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