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FIRE PROTECTION Chapter of this manual for information on APU fire protection system.
APU CONTROL PANEL
START
Fuel and ignition on at 5%.
Starter disengage at approximately
50% RPM.
Ground − ignition off at 50% RPM.
In flight − ignition off at 98% RPM.
(APU enters a 60 second cooldown period)
RPM decreases to 70% RPM for 60 seconds (below 20,000 ft.)
remains at 100% above (20,000 ft.).
After 60 seconds, the RPM will continue to decrease and fuel will stop at this time.
Below 25% RPM the inlet door closes.
Below 5% RPM the EICAS displays and indications are removed.
RUN
Initiates the APU prestart BITE.
On ground, commands the inlet door to full open
In flight, commands the inlet door to open to
either 10% (0.85 MACH) or 20% (0.40 MACH)
Activates the flight compartment
displays (oil quantity, speed and RPM).
Starts the fuel pump.
GF0510_011
OFF
APU
RUN
OFF START
Accelerates to 100% RPM.
AUXILIARY POWER UNIT
Rev 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
05−10−15
START SEQUENCE
The APU requires 28 VDC to start. APU start is automatic, following switch selections of RUN and
START on the APU control panel.
The start sequence is initiated by selecting the APU control switch to RUN:
· APU speed and EGT indicators appear on the EICAS secondary display.
· Activates fuel request signals.
· 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:
· In flight the inlet door opens and “APU IN BITE” message annunciates.
· At approximately 5% speed, fuel and ignition occur.
· 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.
· RPM accelerates to 100%.
· 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:
· RPM decreases to 70% RPM for 60 seconds or remains at 100% (above 20,000 ft.).
· After 60 seconds fuel is terminated and the RPM will decrease rapidly.
· Below 25% RPM the inlet door closes.
· 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.
· BATT MASTER switch select to OFF (on the ground).
· APU DISCH handle pulled.
· 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.
AUXILIARY POWER UNIT
Flight Crew Operating Manual Rev 3, Apr 25, 2005
CSP 700−5000−6
Volume 2
05−10−16
APU EMERGENCY SHUT-OFF BUTTONS
GF0510_012
APU
SHUTOFF
APU COMPARTMENT
APU SHUTDOWN SWITCH
FORWARD BULKHEAD
EXT AC EXT DC
GROUND BATTERY
SERVICE MASTER
LAMP
TEST
APU
SHUTOFF
HDPH MIC
LIGHTS
OFF
SERVICE
RESTART AFTER EMERGENCY SHUTDOWN
In order to restart the APU following an emergency shut down procedure, two conditions have to be
met:
· The BATT MASTER switch has to be in the ON position.
· The switch on the APU control panel must be placed to the OFF position, before moving it to
the momentary START position.
AUXILIARY POWER UNIT
Rev 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
05−10−17
PROTECTIVE SHUTDOWNS
The FADEC will automatically shut down the APU when any of the following are detected:
SHU DOWN CONDITIONS GROUND FLIGHT
NOTE: An X in one or both right columns indicate when
shutdown can or will occur.
FADEC Failure − Internal failure. X X
Inlet Door − Not in commanded position. X X
Loss of Overspeed Protection − Loss of any combination of
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