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 1.  General
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 A.  The fuel quantity indicating system measures the weight of usable fuel in the fuel tanks. Fuel quantity indicators give a visual indication of the fuel weight in each fuel tank. In addition, a fuel summation unit supplies a continuous summation signal input to an on-board computer. The signal is converted to an on-demand display of combined tank total remaining fuel or is used by the computer in various performance parameters. In the No. 1 and No. 2 tanks, five fuel measuring sticks are supplied to find the fuel quantity of the applicable fuel tank by mechanical means.
 B.  The overall system is composed of a subsystem for each fuel tank. Subsystem components are found in the flight compartment, in the fuel tank, and at the refuel station at the wing.
 (1)  
Components in the flight compartment include a fuel quantity indicator and capacitance trimmer for each fuel tank, an indicator test switch found above the fuel quantity indicators, and a fuel summation unit.

 (2)  
Components at the refuel station at the wing include a refuel quantity indicator for each fuel tank and an indicator test switch. The refuel quantity indicators repeat the fuel quantity shown by the fuel quantity indicators in the flight compartment. The refuel quantity indicators operate only when the access door for the refuel station is open.

 (3)  
Fuel and refuel quantity indicators can be interchangeable. Refer

 to the subsequent table. REFUEL STATION - WING (REFUEL QUANTITY) Tank 1 Center Tank 2
 CONTROL Tank 1 YES NO YES CABIN Center NO YES NO (FUEL Tank 2 YES NO YES QUANTITY)
 (4)  Components in the fuel tanks include a compensator unit and a number of tank units for each tank. Fuel measuring sticks are installed in the wing tanks. The tank units in each fuel tank are connected in parallel and positioned so that only usable fuel is measured. Capacitance values of the tank units in each fuel tank are added to give a single capacitance value for the fuel tank, which is measured by the fuel quantity indicator.
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 FUEL QUANTITY INDICATORS  ú ú 01A Page 1 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
CONTROL DISPLAY UNIT
CATHODE

Fuel Quantity Indicating System Component Location
Figure 1 (Sheet 1)

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 FUEL QUANTITY INDICATORS  ú ú 01A Page 2 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
REFUEL STATION
SEE F
FUELING RECEPTACLE WING LEADINGREFUEL PANEL EDGE(P15 PANEL)
SEE G
ACCESS DOOR
FWD
PANEL
LIGHTS

REFUEL STATION
F
VALVE POSITION LIGHTS
TEST
GAGES &

bb b
FUELING
TEST TANK No.2 CENTER TANK TANK No.1
GAGES OPEN OPEN OPEN

OFF
CLOSED CLOSED CLOSED
AUX FUELING
POWER CONTROL

FUEL QTY FUEL QTY FUEL QTY
REFUEL PANEL
G
Fuel Quantity Indicating System Component Location
Figure 1 (Sheet 2)

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 28-41-00
 FUEL QUANTITY INDICATORS  ú ú 01A Page 3 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TANK UNITS (EXAMPLE)

UPPER WING SKIN

WING SKIN
FWD

H
Fuel Quantity Indicating System Component Location
Figure 1 (Sheet 3)

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