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AD/CL-600/118 - Bulkhead Check Valves
Bombardier (Canadair) CL-600 (ChallengerBombardier (Canadair) CL-600 (Challenger) Series Aeroplanes
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Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes
| AD/CL-600/118 | Bulkhead Check Valves | 10/2009 |
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| Applicability: | Bombardier Inc. Model CL-600-2B19, Serial Numbers 7003 and subsequent. |
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| Requirement: | Revise the Transport Canada approved maintenance schedule by incorporating the discard task, Task Number 21-51-21-13, for the bulkhead check valves, P/N 92E20-3 and 92E20-4.This task was introduced by Temporary Revision (TR) 1-2-39, dated12 December 2008, to the Maintenance Requirements Manual, CSP A-053, Part 1, Maintenance Review Board Report, Section 2, System and Powerplant Program.Note: Transport Canada AD CF-2009-31 dated 8 July 2009 refers. |
| Compliance: | Within 60 days after the effective date of this AD unless previously accomplished. |
| This Airworthiness Directive becomes effective on 24 September 2009. | |
| Background: | 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, AD/CL-600/80 (Transport Canada AD CF-2003-05R1) mandated the incorporation of a 4,000 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 However, this repetitive inspection task has since been superseded by a 3,000 flight-hour periodic discard task for these bulkhead check valves.This AD mandates revision of the approved maintenance schedule to incorporate the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 detailed in Corrective Actions, Part A, of Transport Canada ADCF-2003-05R1, subsequently mandated by AD/CL-600/80. |
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James Coyne
Delegate of the Civil Aviation Safety Authority
14 August 2009