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 125/123 Amdt 1 Wing Top Skin Panel 6/93 Applicability: Model 125 aircraft up to and including Series 700A and 700B. Requirement: Action in accordance with British Aerospace Mandatory Service Bulletin 57-73 Revision 1. Compliance: Unless already accomplished, prior to 31 August 1993. Background: Reports of wing top skin corrosion in the area beneath the boundary layer fence. Amendment 1 is issued in response to a revision of the Requirement Document which extends applicability to include 700 A and B Series aircraft.