COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Short SD3-60 Series Aeroplanes AD/SD3-60/40 Amdt 1 Flight Controls Rudder Gust Lock System 8/94 DM Applicability: All SD3-60 aircraft listed in Short Brothers PLC Service Bulletin SD360-27-23 Revision No 1 dated 15 April 1994. Requirement: Modify the rudder gust lock electrical circuit in accordance with Shorts SD3-60 Service Bulletin SD360-27-23 Revision No 1 dated 15 April 1994. Note: This Service Bulletin has been classified as Mandatory by the CAA(UK). Compliance: Prior to 28 July 1994. Background: The original issue of this Directive required the introduction of a time delay relay in the rudder gust lock electrical control circuit. This relay delays possible locking of the rudder, with the weight on wheels switch closed, if the actuator has runaway in flight. This amendment reflects a revision to the Requirement Document, which contains minor changes to the wiring and accomplishment instructions. The compliance date is unchanged.