BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual page 64

Provided no airplane generators are on line,
the GTC is capable of accepting power from
a suitable external AC source (Figure 2-3).
AUXILIARY AC SYSTEM
Auxiliary generation is accomplished by a
single APU-driven system which may be used
to feed either or both AC main buses. The
APU generator has the same ratings as an en-
gine integrated-drive generator.
APU Generator Adapter
The generator adapter provides the mechani-
cal interface between the APU gearbox and the
AC generator. Since the APU is operated at a
governed speed of 58,737 rpm, a constant-
speed drive is not necessary. Instead, a straight-
through adapter is utilized to operate the
generator at 12,000 rpm to maintain the out-
put frequency at 400 Hz. A self-contained oil
system supplies oil for adapter and generator
lubrication and cooling. The adapter oil is
IDG IDG
1 1
GCU GCU
GLC
1
MAIN AC BUS 1
2-4 CL 601-3A/R
CL-600-2B16 PILOT TRAINING MANUAL
APU APU
GEN GEN
AP/EP
GCU GCU
CONT
GTC
1
Figure 2-3. Main AC Power (Power Off)
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
cooled by APU fuel through a heat exchanger.
The auxiliary power system GCU provides
the same functions as the primary system
GCU. The auxiliary power system GCU pro-
vides the same functions as the primary sys-
tem GCU. The auxiliary power/external power
(AP/EP) contactor (Figure 2-3) supplies power
to the GTC from either the APU or an exter-
nal AC source. Its function is similar to that
of a GLC.
IDG IDG
2 2
GCU GCU
GTC
2
GLC
2
MAIN AC BUS 2
L t ée
L t d.
LEGEND
UNPOWERED