Figure 2-35.--Accessory drive section. A. Accessory gearbox. B. Aft view of accessory gearbox.
The frame liner assembly has an inner and an
pneumatic starter, and the lube and scavenge
outer liner held together with airfoil-shaped strut
pump are mounted on the aft side of the TGB.
fairings butt-welded to both liners. This assembly
It also provides mounting for the GG speed
guides the gas flow and shields the main
pickup. An air/oil separator on the front is a part
structure from high temperature. The PT first-
of the gearbox.
stage nozzle assembly is part of the turbine mid
Power to drive the accessories is extracted
frame assembly. This assembly has 14 segments
from the compressor rotor through a large-
with 6 vanes each. The inner end is bolted to the
diameter hollow shaft which is spline-connected
nozzle support; the outer end is secured between
to the rotor front shaft. A set of bevel gears in
the mid frame aft flange and the PT stator
the inlet gearbox transfers this power to the radial
forward flange.
drive shaft. The radial drive shaft transmits the
power to another set of bevel gears in the forward
Accessory Drive Section
section of the TGB. Each bevel gear is supported
by a duplex ball bearing and a roller bearing. A
The accessory drive section (fig. 2-35) has an
short horizontal drive shaft transmits the power
inlet gearbox in the hub of the front frame, a
to the accessory drive adapters in the TGB.
radial drive shaft inside the 6 o'clock strut of the
front frame, and a TGB bolted underneath the
TRANSFER GEARBOX.--The TGB shown
front frame. The fuel pump and MFC, the
in figure 2-35, view A, has a two-piece aluminum
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