TURBINE SECTION
front bearing support is bolted to the inlet
housing.
The turbine section (fig. 3-14) has several
The second-, third-, and fourth-stage vanes are
parts: the turbine inlet casing and front bearing
mounted in the vane casing. The vane casing is
support, turbine rotor, turbine vanes (not shown)
a one-piece structure bolted between the aft flange
and rear labyrinth seals, turbine vane casing,
of the inlet casing and the forward flange of the
turbine rear bearing support, and the turbine rear
turbine rear bearing support.
scavenge pump.
The turbine inlet casing and front bearing
The turbine rear bearing support contains the
rear roller bearing. It also provides the sump for
support house the first-stage vanes, the front
turbine roller bearing, 18 turbine inlet temperature
the rear bearing scavenge oil and mounting for
thermocouples, and the front labyrinth seal. The
the turbine rear scavenge oil pump.
Figure 3-14.--Allison 501-K17 turbine section.
3-17
