BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual page 271

Figure 9-5 illustrates the APU bleed-air sup-
ply. Unless prevented by the interlock de-
scribed above, when the APU is operating and
the APU RDY light is illuminated, pushing the
APU bleed-air switchlight will cause the APU
LCV to open and the APU surge valve to close.
The APU bleed-air is directed to the left side
of the bleed-air manifold. While operating in
this configuration, with the ISOL switch on and
the isolation valve open, pushing either one of
the engine bleed-air switchlights will cause the
APU LCV to close and the APU surge valve
to open. This protective interlock system pre-
vents reverse airflow to the APU compressor
ATS
LH
ATS
VALVE
10TH STAGE
LEGEND
BLEED AIR
BLEED AIR
PORTS
9-6 CL 601-3A
EMER
PRESS SOV
DUCT
SENSOR
HEAT EXCHANGER
RH FOOT-WARMER
LH FOOT-WARMER
VALVE (NORM)
VALVE (STBY)
LH 10TH STAGE
BLEED-AIR
SOV
PRESSURE
XDUCER
LH ACU
VALVE
LEFT
EXT
ACU
AIR
Figure 9-5. Bleed-Air Supply—APU Operating
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
CL-600-2B16 PILOT TRAINING MANUAL
even though the line is fitted with a check
valve. The isolation valve alone may be open
to permit the APU bleed air to pressurize the
right side of the bleed-air manifold. Both en-
gine bleed-air switches must remain off.
Initiating an engine start (either engine) while
the APU is supplying the manifold will auto-
matically open both engine bleed-air shutoff
valves, the isolation valve, and the selected
start valve. The four valves will remain open
until the start is terminated at approximately
55% N .
2
FAN
RAM AIR
PRESSURIZATION
JET PUMP
ATS VALVE
RH 10TH STAGE
BLEED-AIR
ISOL VALVE
SOV
PRESSURE
XDUCER
RH ACU
VALVE
RIGHT
ACU
LOAD
CONTROL
VALVE (LCV)
APU
DEMIST
CONTROL
KNOB
FOOTWARMER
CONTROL
KNOB
RH
ATS
10TH STAGE
BLEED AIR
PORTS
L t é e
L t d .