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 748/8 Engine Subframe/Wing Attachment Assembly 13/94 Applicability: All HS748 aircraft. Requirement: Action in accordance with British Aerospace Mandatory Service Bulletin 54/29. Note: UK CAA AD 026-11-86 refers. Compliance: As specified in the Requirement Document. Background: Undetected abnormal movement and wear of the engine subframe/wing attachment assembly can lead to the failure of the split bush and/or taper bolt, which can cause severe stress and damage to the engine support structure.