<imagemap>File:Jet-engines-965e4f.jpg|350px|thumb|Technical drawing. Air Intake is on the left rect 307 461 508 556 Power output shaft rect 366 561 548 705 Gearbox rect 452 169 582 264 combustion chamber rect 447 294 582 394 Turbines rect 129 399 297 551 LP compressor rect 312 269 403 496 HP Compressor desc bottom-left </imagemap>
Honeywell TSCP700 is a small turboshaft, used as auxiliary power unit on wide-body airliners.
It was initially developed by Garrett AiResearch, for use as an APU for McDonnell Douglas DC-10. Garrett was merged into AlliedSignal in 1985, then into Honeywell in 1999. Honeywell still provide support for the TSCP700's in circulation. Besides the DC-10, it is also used as APU on the MD-11 and Airbus A300/A310.
TSCP700 provides a mechanical output of 105 kW (for TSP700-5 version used on Airbus aircraft). It has a two-shaft architecture. The compressor design is quite peculiar, as the LP compressor is axial and the HP compressor is centrifugal. After the HP compressor, air is fed to a combustion chamber, and blown through two turbines. The first high-pressure turbine drives the HP compressor and provides the "useful" output (driving, e.g., a power generator), while the second, low-pressure turbine drives the LP compressor shaft.
A small geared turbofan named Garrett TFE731 was developed from TSCP700, borrowing its internal parts. It was successfully marketed for business jets and military trainer aircraft.