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.

models

• AI-25TL: 3,792 lb (16.9 kN) thrust

specifications

• 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