Auxiliary Power Unit (Apu) - FlightSafety LEARJET 45 Pilot Training Manual

AUXILIARY POWER UNIT (APU)

The optional APU generator can provide the
same service as an airplane engine generator
and can be operated in conjunction with one
or both airplane generators. The APU is cer-
tified for ground use only. After starting the
APU using the APU control panel on the cen-
ter pedestal (Figure 2-6), the green APU RUN
annunciator on the APU control panel will il-
luminate and at the same time, the green
AVA I L c a p t i o n o n t h e A P U G E N S / I
(switch/indicator), located on the electrical
control panel, (Figure 2-9) will also illuminate.
After depressing the APU GEN switch on the
electrical control panel, the ON caption will
illuminate and the AVAIL caption will extin-
guish to indicate that the APU contactor has
closed, connecting the APU generator output
to the right generator bus.
The bus-tie contactor automatically closes
with the APU generator on-line. A GPU and
APU generator cannot provide airplane elec-
trical power simultaneously. The APU gener-
ator will automatically drop off-line if the
GPU is selected on-line.
GEN AMPS
I 0 0
A
P
START/STOP
U
APU
FAIL
2-6
L E A R J E T 4 5 P I L O T T R A I N I N G M A N U A L
MASTER
FIRE
ON
FIRE
PUSH
START
RUN
Figure 2-6. APU Control Panel
FOR TRAINING PURPOSES ONLY
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