COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES GAF N22 and N24 Series Aeroplanes AD/GAF-N22/57 Oxygen - Cabin Supply Pipe 4/90 Applicability: All series with oxygen outlets in the passenger cabin. (Customer Options G71B, G71C, or R72). Requirement: Action in accordance with ASTA Nomad SB NMD-35-02. Compliance: Within 100 hours time in service after 30 April 1990. Background: To prevent electrical contact with cabin oxygen lines.