COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 727 Series Aeroplanes AD/B727/18 Outboard Trailing Edge Foreflap Track Guide Block - Installation 6/67 Applicability: All models. Document: Boeing SB No. 57-59. Compliance: Forthwith.