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TGT (Turbine Gas Temperature): The Turbine Gas Temperature (TGT) and T4.5 are identical, as they are the measurement of combustion gasses produced by the Ng that are about to drive the Np. There are seven TGT probes positioned between the Ng and Np of the power turbine of the combustion section of the engine.
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Ng
P-3 air for purging
-3 to-6 p s i (suction) generated by engine ( Ng) driven boost pump, pressure rises tobetween 25 to 27ps i when submerged boost pump is operating. Operating in suction mode prevents fuel system leaks from spraying fuel on the aircraft. Ng speed signal to cockpit (PDU via SDC). Electrical power for ignition. Electrical power for ECU. INPUT MODULE LOW FUEL PRESS fuel presstransmitter 30 MICRON (45 to90psi FLY) Np
Nr F W U 258 Nr = 20,900 Np 100% RPM R = 100% RPM 1 or 2
T-2
Engine and control system overview SFC WILLIAM A. MILLER 1996 (ver 1.03) TRQ signal fromother engines ECU TRQ signal directto other enginesECU. To cockpit (PDU) via SDC. Power Turbine speed signal tocockpit (PDU) viaSDC.
D-13
3. LEARNING STEP 3: Identify the operational characteristics of the T-700 modules and components.
a. Engine Modules and Components-Under the modular maintenance concept, the T700 series turboshaft engines are divided into four modules: Accessory Section Module (Accessory Gearbox), Cold Section Module (Compressor Section), Hot Section Module (Combustion Section), Power Turbine Module (Power Turbine). The engine can be disassembled into the four modules.
The four modules consist of several major components. The T700 engine major components consists of the swirl frame, front frame, main frame, and scroll case which comprise the inlet section of the engine; a vertically split compressor stator casing which provides a housing for the variable and fixed stator vanes, a 6-stage (5 stages axial, 1 centrifugal) compressor rotor; the diffuser case, diffuser and midframe. The components are part of the cold section module. The accessory gearbox is top mounted to the main frame and, together with the various accessories mounted on the forward and aft casings, is the accessory section module.
The combustion liner and stage one turbine nozzle is housed in the midframe, which also provides a mounting provision for the gas generator turbine stator. The combustion liner, stage one turbine nozzle, gas generator turbine stator, and rotor, comprise the hot section module. A two-stage power turbine rotor is housed in the power turbine casing, which also contains the No. 3 and No. 4 power turbine nozzles. The exhaust frame is bolted to the power turbine casing. The power turbine rotor, casing and exhaust frame comprise the power turbine module.
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