# Proposed AD FAA-2010-0276: Bombardier, Inc. Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-20-17
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 5, 2010, 75 FR 17086
- Comments due: May 20, 2010
- Became: [AD 2010-20-17](https://openairdocs.org/ad/2010-20-17)
- Docket: FAA-2010-0276 (https://www.regulations.gov/docket/FAA-2010-0276, where comments are filed)
- Project: 2009-NM-144-AD
- FR document: 2010-6850
- Official PDF: https://openairdocs.org/files/sha256/f1/be/f1be5ef5e177d892fab73ed2d23a01b80e64f4ab4e13d1a508a8af18bf41f448 (from https://www.govinfo.gov/content/pkg/FR-2010-04-05/pdf/2010-6850.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/04/05/2010-6850/airworthiness-directives-bombardier-inc-model-cl-600-2b19-regional-jet-series-100-and-440-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/887E37ABFF59D937862576FC004A89BF.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0276

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above that would supersede an existing AD. 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: Three cases of in-flight loss of cabin pressurization have been reported, resulting from failure of a bulkhead check valve in combination with failure of an air supply duct. In addition to mandating inspection, rework and/or replacement of the air supply ducts, Airworthiness Directive (AD) CF-2003-05 (subsequently revised to CF-2003-05R1) [which corresponds to FAA AD 2004-22-08] mandated the incorporation of a 4000 flight-hour repetitive inspection task for bulkhead check valves, Part Numbers (P/N) 92E20-3 and 92E20-4, into the approved maintenance schedule. However, this repetitive inspection task has since been superseded by a 3000 flight-hour periodic discard task for these bulkhead check valves. This directive mandates revision of the approved maintenance schedule to incorporate the discard task for bulkhead check valves, P/N 92E20-3 and 92E20-4, and supersedes the instructions in Corrective Actions, Part A, of AD CF-2003-05R1, dated 7 February 2006. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Apr 5, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-6850, comments due May 20, 2010 (https://www.federalregister.gov/documents/2010/04/05/2010-6850/airworthiness-directives-bombardier-inc-model-cl-600-2b19-regional-jet-series-100-and-440-airplanes)

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