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The start sequence is initiated by selecting the APU control switch to RUN:
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APU speed and EGT indicators appear on the EICAS secondary display.
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Activates fuel request signals.
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APU IN BITE (on ground only) status message comes on.
.
APU inlet door opens (on ground).
.
APU IN BITE (on ground) advisory message goes out (approximately 10 seconds).
Select the APU control switch to START position (spring loaded from START to RUN) for greater than one second and note the following:
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In flight the inlet door opens and “APU IN BITE”message annunciates.
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At approximately 5% speed, fuel and ignition occur.
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Between 50 and 60% the starter disengages.
NOTE
At 99% RPM plus 2 seconds, the APU is ready to load electrically.
At 99% RPM plus 60 seconds on ground or 2 seconds in flight, the APU is ready to load pneumatically.
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RPM accelerates to 100%.
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For ground stats, ignition is deactivated at 50%. In flight, ignition is deactivated at 98%.
NORMAL SHUTDOWN
Select the APU control switch to OFF (the APU enters a cooldown period) and note the following:
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RPM decreases to 70% RPM for 60 seconds or remains at 100% (above 20,000 ft.).
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After 60 seconds fuel is terminated and the RPM will decrease rapidly.
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Below 25% RPM the inlet door closes.
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Below 5% RPM speed and EGT indications are removed from EICAS display.
EMERGENCY SHUTDOWN
The following methods are considered not normal shut down procedures, but may be used in an emergency situation. Actioning any or all of these procedures will result in immediate shutdown.
Carrying out any of the following shut down procedures will cancel the “cooldown”mode and shut down will occur immediately.
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BATT MASTER switch select to OFF (on the ground).
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APU DISCH handle pulled.
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APU SHUTOFF button on the external services panel or APU SHUTDOWN SWITCH, located inside the APU compartment (on the forward bulkhead) is pushed in momentarily and released.
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
APU EMERGENCY SHUT-OFF BUTTONS
APU SHUTDOWN SWITCH
APU COMPARTMENT FORWARD BULKHEAD
GROUND BATTERY EXT AC SERVICE EXT DC MASTER
SERVICE
LIGHTS LAMP APU HDPH MIC OFF TEST SHUT-OFF
APU SHUT-OFF
RESTART AFTER EMERGENCY SHUTDOWN
In order to restart the APU following an emergency shut down procedure, two conditions have to be met:
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The BATT MASTER switch has to be in the ON position.
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The switch on the APU control panel must be placed to the OFF position, before moving it to the momentary START position.
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