Igniter plugs are installed in number three and six combustion chambers. Right and left, clockwise and
counterclockwise, upper and lower, and similar directional references apply to the engine as viewed from
the rear, with the accessory section at the bottom. Table V gives the leading particulars for the T73-P-
700 and T73-P-1 engines.
8.3.
COMPRESSOR SECTION
The compressor inlet case, illustrated
in figure 8.3, consists of the outer and inner inlet
cases, outer and inner inlet vane shrouds, and
hollow inlet vanes. Bosses and pads are located
on the outer case for the No. 1 bearing
compartment breather, scavenge, and pressure
connections, inlet air pressure and temperature
sensing connections, and anti-icing a air-icing air
ports. The No. 1 bearing housing is bolted to the
inner-inlet-case rear flange.
Figure 8.3. Compressor Inlet Case.
The compressor inlet case houses the first four compressor rotor and compressor vane and
shroud stages. Ports in the rear of the case allow bleed air to be discharged overboard by a bleed band
assembly to aid engine starting and acceleration.
The compressor rotor, shown in figure 8.4, consists of a forward hub assembly, a nine-stage
compressor rotor, and an aft hub assembly. The No. 1 bearing is installed on the forward hub assembly
of the compressor rotor shaft.
The first stage compressor blades are
attached directly to the forward hub while all
other stages of compressor blades are attached to
individual disks. The blades of the first and
second stages are pin mounted to allow the blades
to flex. Stages three through nine have a single
dovetail and are secured in broached slots in the
disk by expend able blade locks.
Figure 8.4. Compressor Rotor.
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