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 748/23 Aileron Operating Arm Bracket 5/98 Applicability: All HS 748 aircraft. Requirement: Action in accordance with Jetstream Aircraft Mandatory Service Bulletin HS748-27- 124. Note: UK CAA AD 007-11-95 refers. Compliance: Unless the initial inspection is already accomplished; within 1,000 flying hours or 6 months after 23 April 1998, whichever occurs first; thereafter as specified in the requirement document. This airworthiness directive becomes effective on 23 April 1998. Background: Cracks have been found in the forward flanges of the aileron operating arm bracket assembly.