The General Electric T64 is a free-turbine turboshaft engine that was originally developed for use on helicopters, but which was later used on fixed-wing aircraft as well.
The original engine design included technical innovations such as corrosion resistant and high-temperature coatings.
[1] The engine features a high overall pressure ratio, yielding a low specific fuel consumption for its time.
[2] Although the compressor is all-axial, like the earlier General Electric T58, the power turbine shaft is coaxial with the HP shaft and delivers power to the front of the engine, not rearwards.
[3] The engine was designed to accommodate different gearboxes or shaft drives, for helicopter or turboprop fixed-wing applications.