# Proposed AD FAA-2009-1229: Bombardier, Inc. (Type Certificate Previously Held by Bombardier Aerospace, Inc.; Canadair) Model CL-600- 2B19 (Regional Jet Series 100 & 440) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-21-11
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 5, 2010, 75 FR 258
- Comments due: February 19, 2010
- Became: [AD 2010-21-11](https://openairdocs.org/ad/2010-21-11)
- Docket: FAA-2009-1229 (https://www.regulations.gov/docket/FAA-2009-1229, where comments are filed)
- Project: 2009-NM-106-AD
- FR document: E9-31290
- Official PDF: https://openairdocs.org/files/sha256/9a/22/9a220ee6640d19df72f19201a4ce578ffd428399586542f340ec4ad18c86d4c2 (from https://www.govinfo.gov/content/pkg/FR-2010-01-05/pdf/E9-31290.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/01/05/E9-31290/airworthiness-directives-bombardier-inc-type-certificate-previously-held-by-bombardier-aerospace-inc
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E5E572D28F64363C862576A20057E048.0001
- Page: https://openairdocs.org/proposed/FAA-2009-1229

## 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:

A specific batch of nose landing gear (NLG) and NLG door selector valves, part number (P/N) 601R75146-1 (Kaiser Fluid Technologies P/N 750006000), may have had their end caps incorrectly lock-wired and/or incorrectly torqued during assembly. This condition can lead to the end cap backing off, with consequent damage to a seal and internal leakage within the valve. Subsequently, if electrical power is transferred or removed from the aircraft before the NLG safety pin is installed, any pressure, including residual pressure, in the No. 3 hydraulic system can result in an uncommanded NLG retraction and/or uncommanded opening of the NLG doors. There have been six cases reported on CL600-2B19 aircraft, one of which resulted in the collapse of the NLG at the departure gate. * * * * * The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Jan 5, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-31290, comments due Feb 19, 2010 (https://www.federalregister.gov/documents/2010/01/05/E9-31290/airworthiness-directives-bombardier-inc-type-certificate-previously-held-by-bombardier-aerospace-inc)

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