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 125/46 Fuel Filter De-Icing Pumps - Replacement 5/77 Applicability: As detailed in the requirement document. Document: Hawker Siddeley SB 28-A63. Compliance: Within 100 hours time in service after 31 May 1977.