COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Short SD3-60 Series Aeroplanes AD/SD3-60/56 Air Conditioner System Wiring 7/99 Applicability: All SD3-60 aircraft that have incorporated Shorts Service Bulletin (SB) SD360-21-21 Original Issue dated August 1994. Requirement: 1. If not previously accomplished, rewire the aeroplane in accordance with Shorts SB SD360-21-21 Revision 1 dated June 1998. Note: CAA(UK) AD 011-03-99 and Shorts Mandatory Service Bulletin SD360-21-23 dated 4 March 1999 refers. Compliance: 1. Before 15 August 1999. This Airworthiness Directive becomes effective on 15 July 1999. Background: Incorporation of Shorts SB SD360-21-21 Original Issue resulted in wiring changes that inhibited the generator failure slave relay from being energised, this resulted in both load shedding busbars not being able to be brought back on line when override is selected. Rewiring in accordance with Revision 1 of the service bulletin restores correct operation of the generator failure slave relay.