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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL
COMPONENT  FIG. SHT 102 QTY  ACCESS/AREA  REFERENCE 
UNIT - TANK, NO. 2 RESERVE FUEL QUANTITY  9  6  TO REAR SPAR 553, RESERVE TANK, L FRONT SPAR  28-41-01 
F183 (PROBE 4)  553BB 
F185 (PROBE 2)  553CB 
F187 (PROBE 1)  553DB 
F189 (PROBE 3)  553EB 
F191 (PROBE 6)  553KB 
F193 (PROBE 5)  553HB 
UNIT - TANK, NO. 3 RESERVE FUEL QUANTITY  10  6  TO REAR SPAR 653, RESERVE TANK, R FRONT SPAR  28-41-01 
F182 (PROBE 4)  653BB 
F184 (PROBE 2)  653CB 
F186 (PROBE 1)  653DB 
F188 (PROBE 3)  653EB 
F190 (PROBE 6)  653KB 
F192 (PROBE 5) 653HB 

Fuel Quantity Indicating System - Component Index
Figure 101 (Sheet 5)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL

SEE

SHT 2
SEE

SHT 6
Fuel Quantity Indicating System - Component Location
Figure 102 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL
INPUT/OUTPUT AND
INDIVIDUAL FUEL
QUANTITY CHANNEL
CARDS
ACCESS DOOR 125B SEE C
FUEL QUANTITY
PROCESSOR UNIT

WINDOW
SEE B
E6 RACK
FWD

FUEL QUANTITY PROCESSOR UNIT, M7860
A FROM SHT 1 COVER
INDIVIDUAL FUEL
QUANTITY CHANNEL INPUT/OUTPUT CARDS FWD CARDS
FUEL QUANTITY PROCESSOR UNIT, M7860
B
LED INDICATOR LIGHT
(REF)
FRONT COVER (REF)
INPUT/OUTPUT AND INDIVIDUAL FUEL QUANTITY CHANNEL CARDS
C
Fuel Quantity Indicating System - Component Location
Figure 102 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL
FUELING QUANTITY INDICATORS, N302 THRU N306
SEE E
FUELING QUANTITY INDICATORS, P42 PANEL
D FROM SHT 1
TEST POWER
VALVE POSITION/CONTROL (MANUAL)
GAGES SYS OVERFILL
BATT OPEN
CLOSED RL IO NORM
CENTER MAIN 2 MAIN 1 RESERVE 2
RESET TOTAL FUEL
156.2  45.0 38.0 13.6 4.0
ACTUAL PRESELECT
38.0 13.6 4.0 TOTAL CTR
OPEN  SELECT QTY  MAIN 3  MAIN 4  RESERVE 3 
PRESELECT CONTROL ALL VALVES CLOSED  1  236 QTY x 1000  I  O  OPEN CLOSED 

FUELING QUANTITY INDICATOR (6 LOCATIONS)
FUELING QUANTITY INDICATORS, N302 THRU N306
E
Fuel Quantity Indicating System - Component Location Figure 102 (Sheet 3)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL
FUEL QUANTITY TANK UNIT, F123
FUEL QUANTITY DENSITOMETER, M7875
SEE

SHT 11
FUEL QUANTITY TANK UNIT, F125 FUEL QUANTITY TANK UNIT (EXAMPLE), F121

SEE

SHT 11 FUEL QUANTITY TANK UNIT, F122

FUEL QUANTITY COMPENSATOR, F120
SEE

SHT 11
FUEL QUANTITY TANK UNIT, F124
CENTER WING TANK COMPONENTS

　
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