# Proposed AD FAA-2012-0036: Bombardier, Inc. Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-08-11
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 23, 2012, 77 FR 3189
- Comments due: March 8, 2012
- Became: [AD 2012-08-11](https://openairdocs.org/ad/2012-08-11)
- Docket: FAA-2012-0036 (https://www.regulations.gov/docket/FAA-2012-0036, where comments are filed)
- Project: 2011-NM-142-AD
- FR document: 2012-1210
- Official PDF: https://openairdocs.org/files/sha256/9c/2c/9c2c1e9f1c253c52b4dd8da532150aab228008ab22a7a08b09ce019b9ac1fd43 (from https://www.govinfo.gov/content/pkg/FR-2012-01-23/pdf/2012-1210.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/01/23/2012-1210/airworthiness-directives-bombardier-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9A1ADFADDE48E4808625798E0048B8A3.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0036

## 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 test reports showing that failure of a retract port flexible hose of a main landing gear (MLG) retraction actuator could cause excessive hydraulic fluid leakage. This proposed AD would require a detailed inspection for defects and damage of the retract port flexible hose on the left and right MLG retraction actuator, and replacement of the flexible hose if needed. We are proposing this AD to detect and correct defects and damage of the retract port flexible hose which could lead to an undamped extension of the MLG and could result in MLG structural failure, leading to an unsafe asymmetric landing configuration.

## Notices in this docket

- Jan 23, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-1210, comments due Mar 8, 2012 (https://www.federalregister.gov/documents/2012/01/23/2012-1210/airworthiness-directives-bombardier-inc-airplanes)

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