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• 60% rpm – Starter cutout – START (white legend) out;
• 95% rpm – Ignition deactivated;
• 95% rpm + 4 seconds (approx) – APU AVAIL (green legend) on; and
• 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 APU 100E
Vol. 2 05−10−14
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
START AND IGNITION (CONT'D)
APU Start
Figure 05−10−8
AUXILIARY POWER UNIT
Description APU 100E
Vol. 2 05−10−15
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
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
To reduce thermo cycles, shutdown the APU in the last running
configuration. Do not change the bleed load before shutting down
the APU.
Pressing out the START/STOP switch/light results in the following:
• AVAIL legend out;
• Internal FCU shutoff valve closes; and
• APU shuts down.
Wait until RPM and EGT gauges wind down through the 6 o’clock position before selecting the
PWR FUEL switch/light.
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 OFF caution message out.
The RPM and EGT indications read zero for 60 seconds and then are removed from EICAS.
AUXILIARY POWER UNIT
Description APU 100E
Vol. 2 05−10−16
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
START AND IGNITION (CONT'D)
APU Normal Shutdown
Figure 05−10−9
AUXILIARY POWER UNIT
Description APU 100E
Vol. 2 05−10−17
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
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 preprogrammed conditions:
Protective Shutdown 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
OVERCURRENT Nil
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
The majority of protective shutdowns generate EICAS messages except for the overcurrent
condition.
APU Fault Panel
Specific faults that cause APU shutdown are annunciated on the APU FAULT panel (except
APU FIRE) by magnetic trip indicators or LEDs. The panel also includes an IND RESET button
to clear all trip indicators following rectification of the fault(s). Starting with aircraft 5492 and
subsequent, the fault panel has LED fault indicators.
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
OVERSPEED magnetic indicator shows a fault 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 APU 100E
Vol. 2 05−10−18
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
START AND IGNITION (CONT'D)
APU Protective/Emergency Shutdowns and Faults
Figure 05−10−10
AUXILIARY POWER UNIT
Description APU 100E
Vol. 2 05−10−19
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
PNEUMATIC SUPPLY
Description
APU compressor bleed air is used to pressurize the left side of the 10th-stage bleed air manifold,
　
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