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  • last update October 1, 2026
STC Air Tractor
  • Air Tractor with 4-blade Avia AV-804
  • Air Tractor with 4-blade Avia AV-804

STC - Data


  • Type of Aircraft: Air Tractor AT-502

  • EASA STC: 10090953 (issued September 23, 2026)

  • STC Holder:
  • MT-Propeller Entwicklung GmbH
  • Flugplatzstrasse 1
  • 94348 Atting
  • Germany

  • Applicable Aircraft: Air Tractor AT-402(), -502() Series
    Models: AT-402, -402B, AT-502, -502A, -502B, -503A
  • Engines: Pratt & Whitney PT6A-( )
  • Propeller: AV-804-1-E-C-F-R(P)/CFR275-446


  • Advantages:
  • Equal or better Performance Data compared with Legacy STC 4-blade propeller
  • Increase of Static Thrust up to 430 lbs for PT6A-34AG engine and up to 200 lbs for PT6A-140AG engine compared to existing Legacy 4-blade propeller STC
  • RPM reduction from 2200 RPM to 2080 RPM for applicable engines for reduced noise and higher efficiency
  • In-field removable blades: Easy installation thanks to separate hub and blade installation; easy shipping
  • No propeller ADs!
  • TBO 2500 hours or 6 years, whatever comes first, for low maintenance costs!
  • Single blades easily replaceable in-field

more information about the STC (.pdf)