COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES British Aerospace BAe 125 Series Aeroplanes AD/HS 125/81 Aileron Mass Balance - Cracking of Side Plate Attachment Lugs Applicability: All models to -700 inclusive. Requirement: Action in accordance with British Aerospace 125 S.B. 57-66, Rev 1. 12/86 Compliance: Prior to 31 March 1987 and thereafter every 600 hours time in service until repaired in accordance with Repair Scheme 25WG/R143. Background: Cracking of the attachment lugs of the aileron mass balance side plate may result in displacement of the side plate and interfere with aileron movement.