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


  • January 2023
STC Slingsby Firefly
  • Slingsby Firefly with 3-blade MTV-12
  • Slingsby T67 Firefly with 3-blade MTV-9


STC - Data


  • Type of Aircraft: Slingsby Firefly

  • EASA STC: 10081036 (issued January 11, 2023)
  • CAA UK STC: UK.STC.00157 (issued October 11, 2022)

  • Applicable Aircraft: Slingsby T67; Model T67M260 Firefly
  • Engines: Lycoming AEIO-540-D4A5
  • Propeller: MTV-9-B-C/C180-50( )


  • Advantages:
  • Best vibration damping characteristics for almost vibration free propeller operations
  • Unlimited blade life
  • Unbeatable esthetic ramp appeal
  • FOD repairable blades
  • Stainless Steel Leading Edges
  • Improved Takeoff Distance
  • Improved Cruise Performance

more information about the STC (.pdf 110k)