COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes AIRWORTHINESS DIRECTIVE For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/CL-600/37 and issues the following 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. AD/CL-600/37 Amdt 1 Flight Spoiler Centre Hinge Fitting 5/2001 Applicability: Model CL-600-2B19 "Regional Jet" aircraft, serial numbers 7003 through 7340. Requirement: Inspect in accordance with Transport Canada AD CF-2000-15 R1. Note 1: Bombardier Alert Service Bulletin (ASB) A601R-57-O27 Revision C refers. Note 2: Installation of redesigned flight spoilers part number 600-10602-73 and -74 provides terminating action to the inspection requirements of Parts A and B of the Requirement document. Compliance: As specified in the Requirement document for the initial and repeat inspection requirements, and eventual replacement requirement; with a revised effective date of 17 May 2001. Note: Compliance with previous versions of ASB A601R-57-027 - original issue, Revision A, or Revision B - also meet the requirements of paragraph A.1 of the Requirement document. This amendment becomes effective on 17 May 2001. Background: Transport Canada received reports of four cases of uncommanded deployment of a flight spoiler due to fracture of the actuator lug on one of the centre hinge fittings of the left or right flight spoiler. In each case a status message was posted and the flight crew landed the aircraft safely. Amendment 1 is issued in response to a revision of the Requirement document which lowers the threshold for inspection of the flight spoiler lug to 3,000 flight cycles. COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES The original issue of this Airworthiness Directive became effective on 5 October 2000. David Alan Villiers Delegate of the Civil Aviation Safety Authority 2 April 2001 The above AD is notified in the Commonwealth of Australia Gazette on 18 April 2001.