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  • last update December 14, 2023
STC Air Tractor AT-501, AT-502

STC - Data


  • FAA STC: SA09189AC (issued May 23, 1996)

  • STC Holder:
  • Riddell Flying Service, Inc., an Arkansas Corporation
  • 124 Phillips 204 Road
  • West Helena, AR 72390

  • Applicable Aircraft: Air Tractor AT-501, AT-502
  • Engines: Walter M601E-11
  • Propeller: V510AG


  • Advantages:
  • Our propellers bring you the unique solution of removable blades. Shipping and storage of such a propeller is much easier and cheaper compared to the fixed blade option.
  • Our blades are made of durable high quality aluminum alloy designed for propeller blades.
  • No propeller ADs
  • TBO 2000 hours or 6 years, whatever comes first, for low maintenance costs
  • No intermediate inspections on an agriculture installation
  • No intermediate inspections are needed between the TBO which requires the propeller removal
  • Reduced cost for spare parts, like blades and lower overhaul costs, for the complete propeller assembly
  • No rpm restriction for the complete operational range