COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES British Aerospace (Hawker Siddeley) HS 748 Series Aeroplanes AD/HS 748/2 Aileron Cable Support Block 12/94 Applicability: Model HS748 aircraft prior to constructors number 1760, except constructors numbers 1723 through 1727. Requirement: Action in accordance with Jetstream Aircraft Service Bulletin HS748-27-63 Rev 2. Note: UK CAA AD 008-05-94 refers. Compliance: Prior to 1 May 1995. Background: The UK CAA requires the incorporation of Modification No 4602, which installs a support block to the pressure skin below the aileron cable loop under the crew compartment floor. This action is required to eliminate the possibility of the aileron cable fouling under certain aileron control wheel loading conditions.