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 AD/CL-600/8 Landing Gear Electrical Harnesses - Modification 3/83 Applicability: All model CL600 aeroplanes as per requirement document. Document: Canadair Challenger SB No. 600-0159. Compliance: Before issue of Australian Certificate of Airworthiness. Background: To prevent landing gear proximity switches from being affected by electromagnetic interference. This may result in loss of aircraft brakes while landing and taxiing with anti-skid system in use.