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/3 Pitch Lock Support Sleeve - Modification NK Applicability: All model R193/4/-30-4/50 installed on Fokker F27; R184/4-30-4/50 installed on Grumman G159; and R179/4-20-4/33 installed on Viscount 810. Document: Dowty Rotol SB No. 61-185 (Mod. No. (c) VP 2032), Rev. 4. Compliance: Before installation in an aircraft following next overhaul completed after 28 February 1966.