AD/CL-600/44 - Power Transfer Contactors (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 39.1 (1) of CAR 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-600/44 Power Transfer Contactors 10/2001 DM

Applicability: Model CL-600-2B19 'Regional Jet' aeroplanes serial numbers 7003 through 7495, 7497 through 7502 and 7505 through 7507.

Requirement: 1. Determine, in accordance with the procedures in Bombardier Alert Service Bulletin (ASB) A601R-24-105 dated 4 July 2001 or Revision A dated 20 July 2001, if installed air driven generator (ADG) emergency hydraulic power transfer contactor K1XC, ADG emergency electrical power transfer contactor K2XD and AC essential power transfer contactor K3XD, all Part Number (P/N) H-A4A-039, have a manufacturing date code of 0011 through 0050. (The power transfer contactors with manufacturing date code 0011 through 0050 are hereafter referred to as 'suspect contactors'.)

2. For aircraft, determined in accordance with Requirement 1, to have a suspect K1XC and/or a K2XD contactor installed, dispatch with an inoperative Integrated Drive Generator (IDG) or Auxiliary Power Unit (APU) generator is prohibited until such time as the suspect contactor(s) is/are replaced as detailed in Requirement 3 and 4 of this Directive.