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• 100% rpm + 15 seconds (approx) – APU GEN OFF caution message on EICAS
(indicating that the APU generator has not been selected on).
The green AVAIL legend on the START/STOP switch/light indicates that the APU is stabilized
and ready for use.
NOTE
If time permits, allow APU rpm to stabilize at 100% for two minutes
before applying electrical or bleed air loads.
AUXILIARY POWER UNIT
Description
Vol. 2 05−10−14
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
START AND IGNITION (CONT'D)
APU Start
Figure 05−10−8
AUXILIARY POWER UNIT
Description
Vol. 2 05−10−15
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
START AND IGNITION (CONT'D)
Normal Shutdown
The APU GEN switch is selected to the OFF/RESET position prior to shutting down the APU.
NOTE
A two minute wait is recommended prior to shutting down the APU,
with the APU in a no-load condition.
Pressing out the START/STOP switch/light results in the following:
• AVAIL legend out;
• Internal FCU shutoff valve closes; and
• APU shuts down.
Pressing out the PWR FUEL switch/light results in the following:
• ECU primary power is removed;
• APU fuel shutoff and negative-G shutoff valves close;
• APU fuel pump turns off; and
• APU GEN OFFAPU GEN OFF caution message out as the RPM and EGT decay.
The RPM and EGT gauges remain in view for approximately 60 seconds while displaying the
actual values, and are then removed.
NOTE
The battery master switch should not be selected off until the RPM
and EGT indications are removed from the EICAS page. This interval
allows the ECU time to complete its shutdown functions, and to
power itself down.
ECU secondary power is removed when all ECU internal checks are completed, to avoid battery
drain.
AUXILIARY POWER UNIT
Description
Vol. 2 05−10−16
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
START AND IGNITION (CONT'D)
APU Normal Shutdown
Figure 05−10−9
AUXILIARY POWER UNIT
Description
Vol. 2 05−10−17
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
START AND IGNITION (CONT'D)
Protective Shutdowns
The ECU automatically shuts down the APU when certain fault conditions are detected.
Automatic protective shutdowns occur for the following pre-programmed conditions:
Protective Shutdowns Table
CONDITION EICAS INDICATION
FIRE
Master warning, fire bell, APU fire light, APU FIRE
warning message
OVERSPEED
Master warning, triple chime, APU OVERSPEED
warning message
OVERTEMP
Master warning, triple chime, APU OVERTEMP
warning message
LOW OIL PRESSURE
Master caution, single chime, APU OIL PRESS
caution message
HIGH OIL TEMPERATURE
Master caution, single chime, APU OIL TEMP caution
message
GENERATOR ADAPTER LOW OIL PRESSURE
Master caution, single chime, APU OIL PRESS
caution message
GENERATOR ADAPTER HIGH OIL TEMPERATURE
Master caution, single chime, APU OIL TEMP caution
message
LOSS OF EGT SENSOR EGT digital readout dashed
UNDERSPEED
RPM readout/pointer (speed below 80% longer than 5
sec)
ECU FAIL Loss of EICAS display for the APU
APU Fault Panel
Specific faults that cause APU shutdown are annunciated on the APU FAULT panel by solid
state LEDs. This panel also includes an IND RESET button to clear all LEDs following
rectification of the fault(s).
If necessary, an emergency shutdown of the APU may be accomplished by using the APU
STOP button, located on the APU FAULT panel. When the APU STOP button is used, the APU
FAULT indicator shows a faulted condition.
Following a protective shutdown or activation of the APU stop switch, the APU control panel
switch/lights must be pressed out before the APU can be restarted.
AUXILIARY POWER UNIT
Description
Vol. 2 05−10−18
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
START AND IGNITION (CONT'D)
APU Protective/Emergency Shutdowns and Faults
Figure 05−10−10
AUXILIARY POWER UNIT
Description
Vol. 2 05−10−19
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
PNEUMATIC SUPPLY
Description
APU compressor bleed air is used to pressurize the left side of the 10th-stage bleed air manifold,
providing pneumatics for engine starting and air conditioning. Reverse airflow protection from the
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庞巴迪挑战者605机组操作手册 CL605-AUXILIARY_POWER_UNIT(5)
