COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 737 Series Aeroplanes AD/B737/59 Engine Fire Extinguishing System 7/91 Applicability: As detailed in the Requirement Document. Requirement: Action in accordance with the Technical Requirements of FAA AD 91-09-12. Compliance: Prior to 28 May 1994. Background: This AD requires modification of the engine fire extinguishing system wiring and plumbing to preclude improper connection during maintenance. Compliance with this AD constitutes terminating action for the repetitive inspections and functional checks required by AD/B737/19.