F-35 engine starter tested.

Lockheed Martin and Pratt & Whitney have completed the first start-up of an F-35 aircraft test engine using an integrated power package and engine-mounted starter/generator. The starter package is an IPP--Integrated Power Package--which combines the functions of an auxiliary power system, an emergency power system and an environmental control unit. A small gas-turbine engine (turbomachine) provides power to the starter and brings the engine up to its threshold starting speed, at which time the engine increases to idle speed and the electrical system transitions from operating as a motor to being a generator. The IPR a subsystem of the F-35's Power and Thermal Management System, also seconds as an in-flight emergency power generator.