AD/CL-600/79 - Aileron Power Control Unit Links (Cth)

AIRWORTHINESS DIRECTIVE For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes AD/CL-600/79 Aileron Power Control Unit Links 9/2007

Applicability: Bombardier Inc. Model CL-600-2B19 - CRJ-100/440 - serial numbers 7003 and subsequent.

Requirement: Accomplish the following in accordance with Bombardier Alert Service Bulletin (ASB) A601R-27-130, Revision A dated 22 December 2003, or later NAA approved revisions:

1. Conduct a detailed visual inspection of the four aileron PCU links for fractures/cracks and replace any fractured/cracked link prior to further flight.

2. As part of the replacement of fractured/cracked links, perform the following:

a. Record the torque value of the forward and aft attachment bolts for both PCU links for the applicable aileron; and

b. Check for mismatch between PCU link and the PCU output fork; and

c. Perform an eddy current inspection of the aileron PCU lugs, and if a crack is found, contact Bombardier in accordance with the above-mentioned ASB; and

d. Record the information requested in Appendix A and Appendix B of the above-mentioned Bombardier ASBs.