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 125/131 Hydraulic System Accumulator 12/92 Applicability: All model 125 up to and including the 800 series aircraft. Requirement: Unless previously carried out, action in accordance with "2. Accomplishment Instructions" contained in Mandatory Service Bulletin No 29-89-3269A. Note: Compliance with this SB has been classified as Mandatory by the UK CAA. Compliance: Prior to 31 August 1993. Background: Due to possible hydraulic fluid contamination of the accumulator air charge, resulting in possible compression ignition, the accumulators are to be charged with nitrogen.