COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 767 Series Aeroplanes AD/B767/51 Evacuation Systems 2/91 Applicability: Model 767 equipped with BFGoodrich escape slides or slide/rafts identified in BFGoodrich SB 25-212. Requirement: Action in accordance with the technical requirements of FAA AD 90-22-04 Amdt 39- 6776. Note: BFGoodrich SB 25-212 refers. Compliance: As specified in the Requirement Document with revised effective date of 21 February 1991. Background: Country of origin AD. To prevent evacuation system malfunctions which may jeopardize successful emergency evacuation of the aircraft.