TM 55-2840-254-23
B.
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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