COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Short SD3-60 Series Aeroplanes AD/SD3-60/20 Amdt 1 Electrical Power - Contactor Body 2/87 Applicability: All model SD3-60 Aircraft with S/Nos SH 3601 through SH 3695. Requirement: Modify the electrical power contactors according to the requirements of Shorts S.B. SD360-24-06 Revision 1. Note: The United Kingdom CAA has classified this service bulletin as mandatory. Compliance: Before 30 April 1987. Background: 1. In service experience has shown that the bodies of the contactors require to be insulated. 2. This Directive has been amended to reflect the manufacturers revised torque procedure reference.