• MT-Propeller USA LogoMT-Propeller USA, Inc.


  • September 2026
STC Airtractor
  • Airtractor with 3-blade Avia V508/108/A
  • Airtractor with 4-blade Avia AV-804


STC - Data


  • Type of Aircraft: Airtractor AT 502

  • EASA STC: 10090953 (issued Sept. 23, 2026)
  • FAA STC: i.P.

  • Applicable Aircraft:Air Tractor AT-502( ) Models: AT-402, -402A, -402B, AT-502, -502A, -502B, -503A
  • Engines: Pratt & Whitney PT6A-( )
  • Propeller:  AVIA 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 because separate hub and blade installation
  • 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