COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Propellers - Variable Pitch - Dowty Rotol AD/PR/7 Operating Cylinder - Replacement NK Applicability: All models detailed in SB No. 61-564 not incorporating Mod. No. (c) VP 2422 (SB 61-540). Document: Dowty Rotol SB No. 61-564. (Mod. No. (c) VP 2480). Compliance: Before 1 January 1970.