Following a selection process which included detailed preliminary studies and ended up in a formal Request For Proposal opened to several Engine Manufacturers, Finmeccanica-Alenia Aermacchi selected Williams International FJ44-4M to power the new M-345 HET (High Efficiency Trainer) aircraft.

FJ44-4M is the fully aerobatic version of FJ44-4A engine. It is a modern two–spool co–rotating turbofan engine with medium bypass ratio, mixed exhaust, and high cycle pressure ratio.

FJ44-4M is in the class of 3400 lbs thrust with low fuel consumption, and takes advantage of Williams well recognized track in maintenance services in order to further reduce operating costs.

The two Companies already started joint activities to finalize the collaboration framework which will lead to integrate the engine into M-345 HET aircraft in the next couple of years.