BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual page 285

The engines incorporate air turbine starters
(ATS), therefore, a bleed-air source is required
to start the first engine. The second engine can
be started using the same source or a cross
bleed source from the operating (first) engine.
The APU bleed-air system is the normal source
of air used to start both engines.
ATS
10TH STAGE
BLEED AIR
LEGEND
PORTS
BLEED AIR
LH ATS VALVE
LH 10TH STAGE
BLEED-AIR
SOV
PRESSURE
LEFT
XDUCER
EXT AIR
ACU
Figure 9-4. Bleed-Air Supply—Normal Operation
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
CL-600-2B16 PILOT TRAINING MANUAL
Prior to selecting an engine start using APU
bleed air, both engine bleed-air switches must
be out (off) because an interlock circuit will
automatically close the APU load control valve
(LCV) if switches are positioned in. That is,
if the left bleed-air switch alone is selected on
(in) or the right bleed-air switch together with
the ISOL switch are selected on (in), the APU
LCV will close.
PRESSURIZATION
JET PUMP
RH ATS VALVE
RH 10TH STAGE
BLEED-AIR
ISOL VALVE
SOV
PRESSURE
XDUCER
RH ACU
VALVE
LH ACU
VALVE
RIGHT
ACU
LOAD
CONTROL
VALVE (LCV)
APU
L t é e
L t d .
ATS
10TH STAGE
BLEED AIR
PORTS
CL 601-3R 9-5