COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Israel Aircraft Industries 1123 and 1124 (Westwind) Series Aeroplanes AD/IAI-W/11 Elevator and Rudder Servo Installation 5/86 Applicability: Model 1124 and 1124A Westwinds, all serial numbers prior to 437 except 418, 423, 426, 429, 431, 432 and 435. Requirement: Action in accordance with 1124 Westwind Service Bulletin No 1124-22-072. Compliance: Within 100 hours time in service after 31 May 1986. Background: The manufacturer has identified the possibility of elevator and/or rudder control interference with existing hardware.