Engine

TM 55-2840-254-23

As the compressor rotor is turned by the starter system, air enters the inlet housing. This air is

directed into the compressor rotor area and is compressed. The compressed air flows through the air

diffuser and into the combustion chamber. Some of this air mixes with fuel from two starting fuel

nozzles to form a combustible mixture. Four spark igniters provide spark and ignite the mixture. This

creates hot expanding gases which are discharged through the turbine section. Some energy from the

hot gases drives two gas producer turbine discs which drive the compressor rotor. The remaining energy

drives two power turbine discs which drive the output shaft. When engine reaches certain speed, the fuel

control and flow divider allow metered main fuel to flow to 28 main fuel nozzles. These nozzles allow

fuel to flow into the combustion chamber where it is ignited by burning starting fuel.

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