COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES British Aerospace BAe 146 Series Aeroplanes AD/BAe 146/10 Oxygen Main Supply Cylinder Corrosion 13/88 Applicability: As detailed in the Requirement Document. Requirement: Action in accordance with BAe 146 SB 35-8. Compliance: Within three months time in service after 29 December 1988 and thereafter at intervals not exceeding 12 months until embodiment of Mod HCM 36032A. Background: Corrosion of the cylinder has been reported in the contact area between the cylinder and the cradle.