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 2.  EICAS Status Page (Fig. 1)_________________
 A.  To select the EICAS status page, press the STAT key on the EICAS display/select panel (P10). This will display real time indications of APU EGT, N1, N2 and OIL QTY.
 3.  EICAS (APU) Maintenance Page____________________________
 A.  The APU maintenance page on EICAS shows the APU data. The APU data comes from the APU controller (APUC). When the APU is off and the GROUND TEST switch is in the NORM position, no data will show on the APU maintenance page. When the APU is off and the GROUND TEST switch is in the ENABLE position, the APU maintenance page will show some data. When you operate the APU, the maintenance page shows all of the APU data. If the APU has a problem, the EFIS/EICAS interface unit (EIU) will get a snapshot of the APU data at the time of the problem. Figure 2 shows examples of the APU maintenance page.
 (1)  
AIR/GND MODE - (AIR or GROUND) The APU controller (APUC) detects and sends the airplanes air/ground configuration.

 (2)  
INLET DOOR - (OPEN or CLOSED) The INLET DOOR display shows the position of the APU inlet door.

 (3)  
STARTER - (ON or OFF) The STARTER motor display will be ON when the APU control switch on the P5 panel is moved to the START position. The starter display will be OFF when power is removed from the starter motor.

 (4)  
IGNITOR - (ON or OFF) The IGNITOR display will be ON when the APU control switch on the P5 panel is moved to START. The IGNITOR display will be OFF when the APUC removes power from the ignition system.

 (5)  
FUEL SOL'S - (ON or OFF / ON or OFF) The FUEL SOL'S display shows the position of the primary and secondary shutoff solenoids. The display will show ON/ON a short time after you move the APU control switch to the START position. The display will show OFF/OFF when the APU is off.

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MAINTENANCE MANUAL

EICAS DISPLAY/SELECT STATUS

 

EICAS Status Page
Figure 1

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MAINTENANCE MANUAL

AIR/GROUND
MODE

INLET DOOR OIL QUANTITY

OIL TEMPERATURE
STARTER FUEL METERING UNIT
IGNITOR STEPPER MOTOR COMMAND/ POSITION
FUEL SHUTOFF
SOLENOIDS

APU INLET AIR PRESSURE FUEL FILTER
APU INLET AIR
BYPASS TEMPERATURE
APU ISOLATION
LOAD COMPRESSOR VALVE INLET TEMPERATURE
LOAD COMPRESSOR LOADING PNEUMATIC
EXIT TEMPERATURE AVAILABILITY LEFT AND RIGHT WING MANIFOLD ELECTRICAL
PRESSURES
LOADING

INLET GUIDE VANE
AVAILABILITY COMMAND/POSITION
PNEUMATIC
DIVERTER VALVE OPERATING CONTROL RESET MODE COMMAND/POSITION
ECS DEMAND PRESSURE SIGNALS LOW OIL
NO. 1 AND 2 GENERATOR LOADS
COOLING
FAN VALVE

APU DATA

EICAS APU Maintenance Page
Figure 2 (Sheet 1)

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A48508
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747-400
MAINTENANCE MANUAL

DISPLAY WITH THE "GROUND TEST"
SWITCH IN THE "NORM" POSITION

EICAS APU Maintenance Page
Figure 2 (Sheet 2)

 A48509
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