Chapter 10
GENERAL ELECTRIC T700-GE-700
10.1.
INTRODUCTION
General Electric is developing the T700-GE-700 turboshaft engine for the U. S. Army Utility
Tactical Transport Aircraft System (UTTAS). The T700 is designed to operate in combat with improved
reliability, easy maintenance, low fuel consumption, and extended operating life.
The T700 will operate with no visible smoke and at low noise levels. External lines and leads
have been reduced in number and grouped for armoring protection. The engine also contains its own
lubrication and electrical systems to reduce dependence on the airframe systems.
10.2.
GENERAL DESCRIPTION
The T700 is an axial-flow, free-power, turboshaft engine rated at 1,500 shp. It has a five-
stage axial, single-stage centrifugal compressor; an annular combustor; a two-stage gas generator (N1)
turbine; and a two-stage power turbine. An engine-driven inlet particle separator is located ahead of the
compressor. For field maintenances, the engine breaks down into four modules: controls and
accessories, cold section, hot section, and power turbine.
The engine is constructed of corrosion-resistant steel except for a titanium axial-compressor
casing, aluminum inlet-separator frame, and magnesium gearbox case. The engine dimensions in inches
are length 47, height 23, and width 25. A cutaway illustration of the T700-GE-700 is shown in figure
10.1.
10.3.
CENTRIFUGAL INLET SEPARATOR
Figure 10.2 shows the centrifugal inlet separator and a schematic of its operation. The inlet
air passes through the fixed separator swirl vanes which swirl the air, and centrifugal force throws the
particles to the separator collection scroll. The scroll is scavenged by an engine-driven blower mounted
on the accessory gearbox.
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