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LCV POSITION(RVDT)
START
RUN BLEEDSOURCE
INLET DOOR POSITION
BOTH ENG
LOAD CONTROL
POWERINLETINLET
VALVE (LCV) TOECU
AIRDOOR
INLET DOORACTUATORENG LR
ENG
AIR/OILCOOLER
APU
INLETTEMPERATURE (T2)TOEDUCTOR AIR
LCV CLOSE
INLETPRESSURE (P2)
T2 SENSOR
LCV OPEN
SPEEDP2 SENSOR EICAS
GEN. OVERLOAD
STAT PAGE
SPEEDGEN. LOAD LEVEL SENSOR EGT
GEARBOX GCU
APU GENERATOR READY TOLOAD
STARTER VOLTSSTARTER
DCU SPEED
DCPOWER28 VOLTS
ECU
GEN
ACTOAIRCRAFT
MDC
AIRCRAFT
BATTERY
IOC APU STARTER -
CONTACTOR
FUELCONTROLOIL
UNIT
UNIT
PUMP APU EGTSENSOR
ADC
LOP SWITCH IGNITIONFUEL
AIREXCITER
DEPRIME NOZZLE
FUELPSEU SOV ASSEMBLY
OIL/GEN. FILTERS DELTAP OILTEMPERATURE SENSOR
GND TORQUE MOTOR MET. VALVE EXTERNALSERVICES
FUELSOLENOID VALVE
PANEL
OILTEMPERATURE
IGNITION ON/OFF
IGNITION BUILT-
IN TEST
EXHAUSTGAS TEMPERATURE (EGT)
APU COMPARTMENTP SHUTDOWNSWITCH
Auxiliary Power Unit Controls and ECU InterfaceFigure 04---30---1
Flight Crew Operating Manual
MASTER CSP A-
013
Vol. 1 04-
30-
3
AUXILIARY POWER UNIT Systems REV56,Jan 31/03
40K
30K OUTSIDE OF SHADEDAREA DOOR IS POSITIONEDTO28 --MID
PRESSURE ALTITUDE 20K 500 ft setpoint change area DOOR POSITIONED TO 42 -
OPEN
13K 10K 6 knots setpoint change area
0 0 100 200 210 260 300 400
TRUEAIRSPEED (TAS)
Auxiliary Power Unit Door Position Chart
Figure 04---30---2
Flight Crew Operating Manual MASTER CSP A-
013
AUXILIARY POWER UNIT Systems Vol. 1 04-
30-
4
REV 56, Jan 31/03
THISPAGEINTENTIONALLYLEFTBLANK
Flight Crew Operating Manual MASTER
CSP A-
013
AUXILIARY POWER UNIT Vol. 1 04-
40-
1
Control REV 56, Jan 31/03
1. CONTROL
The APUelectronic controlunit(ECU)providesfullautomatic control ofAPU starting, stopping,andprotectstheAPUduring all modesofoperation. The controlsystem ensures thatpriorityis given to electricalloadsby reducingbleedairflow.
A. Starting
WhenthePWRFUEL switchlight, on theAPUpanel, is selected: W The ECUis powered W The air inletdooropens(position is displayed ontheEICAS statuspage) W The APURPMandEGTgauges are displayed ontheEICAS statuspage W The fuelpump comes on.
WhentheSTART/STOP switchlight, on theAPU controlpanel, is selected: W The ignition is activated W The startermotoris energized W The fuel shutoff valve opens W The STARTlegend ontheAPUpanel comes on W The APUSTART status messageis displayed.
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