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Invalid data
START/STOP
When pressed in:
Start motor on
START light (white)
comes on
At 60% rpm, START
light goes out
AVAIL light (green)
comes on 2 seconds
after APU reaches
99% rpm.
When pressed out:
Fuel shut--off valve
closes
APU shuts down
AVAIL light goes out
Air inlet door closes
APU Compartment
Forward Firewall
APU Emergency Stop
Used by maintenance personnel
to shut down the APU.
BRT
PWR FUEL
When pressed, APU
fuel pump is energized
and APU fuel shut--off
valve opens, APU EICAS
gauges and APU IN BITE
message are displayed.
On the ground, air inlet
door is scheduled to
open.
PUMP FAIL (amber)
light comes on to
indicate that APU fuel
pump has failed.
SOV FAIL (amber)
light comes on to
indicate that the APU
fuel shut--off valve has
failed.
When pressed again,
APU fuel pump is
de--energized.
Vol. 1 04--40--3
AUXILIARY POWER UNIT
Control Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
EICAS Auxiliary Power Unit Indications --- Primary Page <1001>
Figure 04---40---2
APU OVERSPEED warning (red)
Indicates that APU overspeed
condition exists. APU shuts down
automatically. APU
APU OVERTEMP warning (red)
Indicates that EGT overtemperature
shutdown limit exceeded. APU
shuts down automatically on the
ground.
APU
NOTE:
If overspeed or overtemperature
occur during flight, do not restart APU.
APU DOOR OPEN caution (amber)
Indicates that APU door failed to close
after APU shutdown.
APU ECU FAIL caution (amber)
Indicates that no data is received from
the ECU with PWR FUEL selected on.
APU FAULT caution (amber)
Indicates a fault requiring the APU to
be shutdown. APU shuts down
automatically on the ground.
NOTE:
For pneumatic messages refer to Chapter 19.
Primary Display
Vol. 1 04--40--4
AUXILIARY POWER UNIT
Control Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
Auxiliary Power Unit and Indications --- Status
Figure 04---40---3
BRT
APU ALT LIMIT status (white)
Indicates that surge control valve
has failed.
APU FAULT status (white)
Indicates loss of redundancy in
sensors, impending filter bypass or
fuel valve has failed open.
APU IN BITE status (white)
Indicates air inlet door not in
position with PWR FUEL
selected on.
APU START status (white)
Indicates that starter motor is
engaged.
APU Inlet Door Status
Indicator (white)
Indicates air inlet door position:
DOOR CLSD
DOOR OPEN
DOOR INHIB/CLSD
DOOR INHIB/OPEN
DOOR -- -- -- (amber dashes)
APU EGT Readout, scale and
pointer (green)
Indicates exhaust gas temperature
in degrees Centigrade. Readout
and pointer turn red during
overtemperature condition.
APU RPM Readout, scale and
pointer (green)
Indicates percent of APU rpm.
Readout and pointer turn red
during overspeed condition.
100 430
APU
RPM EGT
NOTE:
Amber dashes indicates position
unknown. Amber DOOR OPEN
indicates door has failed to close
after APU shutdown.
Status Page
Vol. 1 04--40--5
AUXILIARY POWER UNIT
Control REV 1, Jan 13/03
Flight Crew Operating Manual
CSP C--013--067
Auxiliary Power Unit Start Sequence
Figure 04---40---4
IGNITION
OFF ON
GROUND
FUEL SOLENOID
ENERGIZED
RPM
EICAS SECONDARY DISPLAY
ECU POWER--UP
DOOR TO
FULL OPEN
BATTERY
MASTER
”ON”
PRESS
PWR FUEL
SW/LT
PRESS START
SW/LT, IGNITION, OIL
DEPRIME SOLENOID
STARTER
CUTOUT
(INFLIGHT),
OIL DEPRIME
SOLENOID
(CLOSE)
STARTER
CUTOUT
IGNITION
OFF INFLIGHT,
TIME TOTALIZER
ENERGIZED
READY
TO
LOAD
SWITCH / LIGHT SELECTED
APU IN BITE
APU SOV OPEN
APU START
Vol. 1 04--40--6
AUXILIARY POWER UNIT
Control Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
C. Protective Shutdown
The ECU will shut down the APU (on ground or in flight) if any of the following faults
occur:
S Overspeed -- APU speed exceeded 106 percent.
S Loss of overspeed protection -- A combination of speed sensors or overspeed
circuits fail.
S Loss of speed sensor signals -- Both speed sensor channels failed.
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