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/14 Blade Retaining Bolt Locking NK Segment - Replacement Applicability: As detailed in the requirement document. Document: Dowty Rotol SB No. 61-714, Rev. 1. Compliance: Before installation in an aircraft following next overhaul completed after 1 January 1972.