The IAF considers it essential to put new engines on the Jaguar, since its current Rolls-Royce Adour 804/811 engines, which deliver a maximum thrust of 32.5 KiloNewtons do not allow the fighter to climb or accelerate effectively. Honeywell’s F-125IN engines, each of which generates a maximum thrust of 40.4 KiloNewtons, are considered essential for fielding it in combat.
Honeywell planned to build the F-125IN engines in Taiwan, where the International Turbine Engine Company already builds Honeywell’s F-124 engine for Taiwan’sF-CK-1 Ching-kuo fighter. The F-125IN is the same engine, with an afterburner to increase thrust.
Honeywell sources say the IAF’s years of delay has convinced the company that this project is unlikely to come to fruition and that no more resources should be expended on this.