Overview Specifications Resources Click to enlarge Fullscreen The 131-9 Auxiliary Power Unit (APU) introduced a two-stage axial turbine for longer engine life and a single starter/generator that uses electrical power to start the APU, and then becomes a generator once it’s running. This has...
The 331-500 series became the first Honeywell APU to use an eductor for oil cooling, eliminating the need for oil cooling fans. The success of this design led to its use on both the Honeywell 131-9B and RE200 series. Compatible Aircraft Airbus A300 Boeing Save page as ...