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an APU fire condition.
APU IN BITE status (white)
Electronic control unit is running
diagnostics (prior to start), for
approximately 5 seconds.
APU ECU FAIL status (white)
Electronic control unit has failed.
APU fuel feed SOV is confirmed
open.
APU LCV OPEN status (white)
APU load control valve is open.
10th stage, APU LCV OPEN
switch/light comes on.
APU SOV OPEN status (white)
APU fuel feed SOV is open with the
APU not ready and no APU fire
detected.
APU START status (white)
APU start in progress.
REV 56, Jan 31/03
Vol. 1 04--40--8
AUXILIARY POWER UNIT
Control
Flight Crew Operating Manual MASTER
CSP A--013
APU Start Sequence <MST>
Figure 04---40---6
FUEL SOLENOID
IGNITION ON
EICAS SECONDARY DISPLAY
ECU POWER--UP
DOOR TO
FULL OPEN
BATTERY
PRESS
PWR FUEL
SW/LT
STARTER
CUTOUT
SWITCH / LIGHT SELECTED
ENERGIZED
OFF
LIGHT
SW/LT
PRESS
START/STOP
<0039>
<0039>
<0039>
<0039>
Vol. 1 04--40--9
REV 56, Jan 31/03
AUXILIARY POWER UNIT
Control
Flight Crew Operating Manual
CSP A--013
MASTER
C. Protective Shutdown
The ECU will shut down the APU (on the ground) if any of the following faults occur:
S Overtemperature -- APU EGT exceeded schedule limits
S Low oil pressure (LOP) -- Low oil pressure exists for 15 seconds with the APU
operating
S High oil temperature -- Oil temperature exceeded 325_C (617_F) with the APU
operating
S Overspeed -- APU speed exceeded 107 percent
S DC power loss -- Battery power lost
S Loss of EGT signal -- EGT sensor failure
S Loss of speed signal -- Speed sensor failure
S Overcurrent -- Fuel torque motor failure
S Door position -- Door not in commanded position
S ECU failure -- Internal ECU failure
S Slow start -- Starter time period exceeded
S Emergency fire shutdown -- APU FIRE PUSH or one the two external stop switches
have been activated
S Starter relay -- No rotation.
All the above protective shutdowns are inhibited in flight mode by a weight--off--wheels
signal from the PSEU, except for the following 5 failures:
S Overspeed
S DC power loss
S ECU failure
S Loss of speed signal
S Emergency fire shutdown.
REV 56, Jan 31/03
Vol. 1 04--40--10
AUXILIARY POWER UNIT
Control
Flight Crew Operating Manual MASTER
CSP A--013
D. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
APU Controls
APU BAT
CONT APU BAT DIR
5
B2
APU ACT MAIN BAT
DIR
A3
Auxiliary
Power Unit
APU
Electronic
Control Unit
APU ECU DC BAT 1 N12
Battery
Charging
APU
CHARGER AC UTIL 2 2 E5
Fire
Extinguishing APU FIRE EXT DC EMERG
BUS 1 R5--6
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