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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 05.10.15
Oct 05/06
APU Start
Figure 05.10.8
AUXILIARY POWER UNIT Description Vol. 2 05.10.16
Oct 05/06
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:
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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;
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APU fuel shutoff and negative-G shutoff valves close;
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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 05.10.17
Oct 05/06
APU Normal Shutdown
Figure 05.10.9
AUXILIARY POWER UNIT Description Vol. 2 05.10.18
Oct 05/06
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
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 05.10.19
Oct 05/06
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