COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Propellers - Variable Pitch - Allison/Aeroproducts AD/PAP/8 Amdt 1 Propeller Time Controlled Inspections 1/75 Applicability: All model A6441 FN-606 and 606A propellers. Document: Allison CSL No. 140, Rev. 11. Compliance: As detailed in the requirement document except that calendar period for hubs and blades shall not exceed 55 months.