COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 747 Series Aeroplanes AD/B747/94 Fire Extinguishing System 6/91 Applicability: As detailed in the Requirement Document. Requirement: Action in accordance with the technical requirements of FAA AD 91-05-04. Compliance: As specified in the Requirement Document. Background: This AD requires modification of the fire extinguishing system in order to preclude the possibility of improper connection of the system wiring during maintenance.