Ivchenko AI-25

Ivchenko developed the AI-25 for the Yak-40. The design stresses simplicity over performance resulting in a conservative engine. The AI-25TL is a long-jet pipe variant used in the Aero L-39.
The earliest flight I can find for the AI-25 is in 1966 powering the prototype Yak-40.


  • AI-25TL: 3,792 lb (16.9 kN) thrust


  • Turbofan (2-spool)
  • Compressor: 8-stage
  • Turbine: 3-stage
  • Pressure ratio: 8:1
  • Bypass ratio: 2

used by

  • Aero L-39 Albatros
    Yakovlev Yak-40