COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 727 Series Aeroplanes AD/B727/5 Amdt 2 Tailplane Rear Spar Lower Cap - Inspection 9/66 Applicability: All models. Document: Boeing SB No. 55-18, Rev. 5. Compliance: Forthwith.