FAA AC 33.83-1:2009
FAA AC 33.83-1:2009 Comparative Method To Show Equivalent Vibratory Stresses And High Cycle Fatigue Capability For Parts Manufacturer Approval Of Turbine Engine And Auxiliary Power Unit Parts Specifies a comparative test and analysis method that may be used for turbine engine or auxiliary power unit (APU) blades or vanes when produced under parts manufacturer approval (PMA).