COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Propellers - Fixed Pitch AD/PFP/12 Sensenich Propellers - Blade Straightening Limits NK Applicability: All models of Sensenich fixed pitch metal propellers. Requirement: Irrespective of data on "The Maximum Allowable Bend for Cold Straightening" published by the manufacturer, propeller blades shall not be cold straightened at any position closer to the hub than 20" from the blade tip. Compliance: Forthwith.