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/9 Propeller Blades - Inspection 9/80 Applicability: All models A6441 FN-606 and -606A propeller blades. Requirement: Inspect propeller blades in accordance with Part 2 of Allison CSL 240, Rev. 3. (FAA AD 79-24-07 refers). Compliance: At periods not exceeding 3250 hours. Background: The manufacturer has introduced additional blade inspection requirement.