TM 55-2835-209-23
1-15 GEARBOX ASSEMBLY
a.
The gearbox assembly houses
the reduction geartrain that
reduces the output rotational
speed of the power section as-
sembly to the speeds necessary
for operation of accessories
and customer furnished equip-
ment.
Output pads are pro-
vided for mounting a generator
and starter.
The shaft speeds
are 12,000 rpm for the genera-
tor and 8190 rpm for the star-
ter at 100 percent APU
operating speed.
The input
pinion (1) of the turbine as-
sembly, splined to the rotor
shaft drives three planetary
gears (2) that are mounted in
a carrier (3).
b. The planetary gears (3) drives
the internal gear (4). The
internal gear (4) is mounted
on a splined output shaft.
c.
The internal gear (4) drives
the idler gear (5). The idler
gear (5) in turn drives the
lube pump/fuel control gear
(6) and starter gear (7).
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