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power to the ECU.
In the event of an emergency, the flight crew can press the APU FIRE PUSH switchlight
on the glareshield. On the ground, the APU can be shut down by pushing an APU
emergency stop button located in the aft equipment compartment or by selecting the
APU shut--off (cover--guarded) switch on the external services panel on the RH forward
fuselage. Either selection sends a signal to the ECU to carry out an immediate
shutdown.
NOTE
If overspeed or overtemperature occurs during flight,
do not restart the APU.
Vol. 1 04--40--3
REV 56, Jan 31/03
AUXILIARY POWER UNIT
Control
Flight Crew Operating Manual
CSP A--013
MASTER
Start/Stop Run Controls
Figure 04--40--1
APU EMER
STOP
APU EMER STOP Switch
Used by maintenance personnel
to shut down the APU during
ground servicing.
AFT Equipment Bay
(Below APU)
APU SHUT--OFF Switch
Used by maintenance personnel
to shut down the APU during
ground servicing.
APU START/STOP
Switch/Light
When pressed in,
starter motor is
energized and START
light (amber) comes on.
At 50% rpm, START
light goes out.
At 95% rpm, and 4
seconds later, AVAIL
light (green) comes on.
When pressed out:
FCU shut--off valve
closes.
APU shuts down,
and
AVAIL light goes out.
PWR FUEL Switch/Light
When pressed in, crossflow/APU pump is
energized, APU IN BITE, APU gauges energized,
door scheduled to open and APU fuel shut--off
valve opens.
PUMP FAIL light comes on to indicate that
crossflow/APU pump has failed.
SOV FAIL light comes on to indicate that the
APU fuel feed SOV has failed.
External Service Panel
Right Forward Fuselage
APU Control Panel
Overhead Panel
REV 56, Jan 31/03
Vol. 1 04--40--4
AUXILIARY POWER UNIT
Control
Flight Crew Operating Manual MASTER
CSP A--013
Fuel Synoptic Page <MST>
Figure 04---40---2
Fuel Synoptic Page
or
or
Vol. 1 04--40--5
REV 56, Jan 31/03
AUXILIARY POWER UNIT
Control
Flight Crew Operating Manual
CSP A--013
MASTER
APU Door and Run Indication <MST>
Figure 04---40---3
NOTE
The gauges will remain in
view for approximately
60 seconds, after PWR FUEL
switch/light pressed out.
Status Page
<0039>
<0039>
The APU gauges come
on when the electronic
control unit is powered
(APU PWR FUEL
switch/light pressed in).
With the ECU
powered, gauge
information is
maintained during
shutdown. pressed out).
The APU gauges go
off when the electronic
control unit is not
powered (APU PWR
FUEL switch/light
REV 56, Jan 31/03
Vol. 1 04--40--6
AUXILIARY POWER UNIT
Control
Flight Crew Operating Manual MASTER
CSP A--013
APU EICAS Messages --- Primary Page <MST>
Figure 04---40---4
APU OVERTEMP warning (red)
EGT is greater than 743 C with
APU RPM greater than 87 % or
greater than 974 C at all times.
APU shuts down automatically
(on ground).
APU
Primary Page
<0039> <0006>
APU OIL PRESS
APU has low oil pressure. APU shuts down
automatically. (On ground only).
APU OIL TEMP
APU has high oil temperature (325 C). APU
shuts down automatically. (On ground only).
APU FAULT
Loss of APU control circuits (microprocessor,
thermocouple or speed signal). APU shuts down
automatically.
APU SOV FAIL
APU Fuel Feed SOV not in a confirmed position
(either open or closed).
APU SOV OPEN
APU Fuel Feed SOV is open 10 seconds after an
APU fire condition. APU FUEL SOV light, on APU
panel, comes on (amber).
APU LCV FAIL
Load control valve has failed (either open or closed).
APU BLEED ON
Load control valve is open and barometric altitude
is greater than 15,000 feet.
X--FLOW/APU PUMP caution (amber)
Comes on to indicate that X--flow/APU pump has
failed (low pressure). Accompanied by XFER/APU
PUMP switch/light indicating FAIL.
APU OVERSPEED warning (red)
APU is running greater than 107 %
rpm. APU shuts down automatically.
APU
Vol. 1 04--40--7
REV 56, Jan 31/03
AUXILIARY POWER UNIT
Control
Flight Crew Operating Manual
CSP A--013
MASTER
APU EICAS Messages --- Status <MST>
Figure 04---40---5
Status Page
<0039>
<0039>
APU SOV CLSD advisory (green)
APU fuel feed SOV is closed during
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