COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Dornier DO-27 Series Aeroplanes AD/DO-27/4 Flap Control Lever - Modification 5/64 Applicability: All DO-27 fitted with flap actuating levers without control grip. Document: Dornier TB No. 27-18. Compliance: Before 1 September 1971.