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 125/78 Sealing of APU Plenum Shroud 7/86 Applicability: All DH/HS/BH/BAe 125 series up to and including aircraft 258030 post mod 251605 and 258748. Requirement: Action in accordance with British Aerospace SB 49-31-(9286A) Rev 1. Note: C.A.A. Airworthiness Directive 007-02-86 refers. Compliance: Prior to 31 December 1986. Background: To reduce the possibility of APU fuel leakage into the rear equipment bay.