TM 55-2840-254-23
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AIR INLET HOUSING ASSEMBLY. Located at front of engine. One-piece casting forming an inner
and outer housing joined by four hollow struts. Contains engine oil supply tank.
Internally provides mounting surfaces for the output shaft support housing, tor-
quemeter head assembly, accessory drive gear assembly (with all gearing to ex-
tract power for the accessory gearbox assembly), and the No. 1 and No. 3 bear-
ings and supports. Outer housing has four equally spaced engine mounting pads.
Externally provides mounting pads for the starter drive assembly, oil filler assem-
bly, torquemeter junction box, and oil level indicator.
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COMPRESSOR HOUSING ASSEMBLY. Consists of two halves that fit around the compressor rotor
assembly. Secures in front to inlet housing assembly, and to the air diffuser assem-
bly in the rear. Stator vanes, secured inside the housing, fit between the compressor
rotor assembly stages when housing is in place.
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COMPRESSOR ROTOR ASSEMBLY. Supported at the inlet housing by the No. 1 main bearing and
at the air diffuser assembly by the No. 2 main bearing. Consists of seven compres-
sor stages and a centrifugal impeller tightly fitted on a common shaft.
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AlR DIFFUSER ASSEMBLY. Mounts on compressor housing rear flange. Supports combustor as-
sembly and non-turning parts of turbine section and provides mounting surface for
No. 2 bearing housing. Contains internal vanes to cut down on air swirl and direct
compressor air to combustion section. Also contains internal oil tubes for No. 2
bearing lubrication.
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GAS PRODUCER TURBINE SECTION. Consists of curl assembly, first turbine nozzle assembly,
cylinder, first turbine disc assembly, spacer, second turbine nozzle assembly, and
second turbine disc assembly. Discs and spacer are coupled together and mounted
on rear of compressor rotor shaft. All other parts are supported by the air diffuser
assembly.
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COMBUSTOR ASSEMBLY. Mounts on the air diffuser assembly. Consists of a combustor housing,
a vane assembly, and a liner assembly. Liner has holes arranged to control air for
cooling and combustion. The housing assembly fits around the liner assembly and
the power turbine assembly and provides an area for combustion and expansion.
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POWER TURBINE ASSEMBLY. Mounts to and fits into the combustor assembly. Power shaft goes
forward through the compressor rotor shaft. Supported in front by No. 3 main
bearing. Supported in rear by No. 4 and 5 main bearing which are part of the
power turbine assembly. Contains two disc assemblies and two nozzle assemblies.
First disc assembly (third turbine disc) and power shaft are made as one piece. The
second disc assembly (fourth turbine disc) mounts on the shaft so the shaft and
disc assemblies rotate as a unit. Also contains thermocouple harness and probes
so temperature at power turbine inlet may be monitored. Internally contains oil
tubes for the No. 4 and 5 bearing lubrication.
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