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Honeywell TSCP700 is a small turboshaft, used as auxiliary power unit on wide-body airliners.

Origin and use

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.

Design

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.

Derivative

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.

References

1. ^ "Life Ahead For TFE731 As Honeywell Plans Upgrade At 50th Anniversary | Aviation Week Network". aviationweek.com.
2. ^ "EASA.A.172 - Airbus A300, A310 and A300-600". EASA.
3. Malohn, Donald A. (1 February 1970). "TSCP700 Auxiliary Power Unit for the DC-10 Aircraft": 700815. doi:10.4271/700815. {{cite journal}}: Cite journal requires |journal= (help)

• Honeywell
• Turboshaft engines