# Proposed AD FAA-2011-0031: Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701, & 702), CL-600-2D15 (Regional Jet Series 705), and CL-600-2D24 (Regional Jet Series 900) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-23-09
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 25, 2011, 76 FR 4264
- Comments due: March 11, 2011
- Became: [AD 2011-23-09](https://openairdocs.org/ad/2011-23-09)
- Docket: FAA-2011-0031 (https://www.regulations.gov/docket/FAA-2011-0031, where comments are filed)
- Project: 2010-NM-135-AD
- FR document: 2011-1440
- Official PDF: https://openairdocs.org/files/sha256/12/86/12863c7c17f810a214c6e81f161bb98131e6e7fd5cfca73a8afb40d11ffe8324 (from https://www.govinfo.gov/content/pkg/FR-2011-01-25/pdf/2011-1440.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/01/25/2011-1440/airworthiness-directives-bombardier-inc-model-cl-600-2c10-regional-jet-series-700-701-and-702
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B18BBCF2AD81765D86257823004DC6C3.0001
- Page: https://openairdocs.org/proposed/FAA-2011-0031

## 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:

There have been two reported cases of failure of the MLG [main landing gear] piston axle, P/N [part number] 49203-3 or 49203-5, resulting from fretting between the inboard axle sleeve and axle thrust face, damage to the protective coating and consequent stress corrosion. In both cases, the MLG did not collapse.

* * * * *

The unsafe condition is failure of the MLG, which could adversely affect the airplane's safe landing. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Jan 25, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-1440, comments due Mar 11, 2011 (https://www.federalregister.gov/documents/2011/01/25/2011-1440/airworthiness-directives-bombardier-inc-model-cl-600-2c10-regional-jet-series-700-701-and-702)

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