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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 FUEL QUANTITY INDICATING SYSTEM - DESCRIPTION AND OPERATION
___________________________________________________________
 1.  General (Fig. 1)_______
 A.  The fuel quantity indicating system measures the weight of usable fuel in the fuel tanks. Fuel quantity indicators on the pilots' instrument panels and at the refuel quantity indicators in the refuel station on the wing supply visual indication of the fuel weight in each fuel tank. In addition, a fuel summation unit found on the first officer's auxiliary panel supplies a continuous summation signal input to an on-board computer where it 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 has a subsystem for each fuel tank, with components found in the control cabin, in the fuel tank, and at the refuel station at the wing.
 (1)  
Components in the control cabin include a fuel quantity indicator and a 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 on 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 control cabin. 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 fuel tank. Fuel measuring sticks are installed in the No. 1 and No. 2 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, which is transmitted to the fuel quantity indicator.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú

 28-41-02
 QUANTITY INDICATORS  ú ú 01 Page 1 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
CATHODE
CRT BRIGHTNESS RAY TUBE
CONTROL KNOB

 

INDICATOR TEST SWITCH

TRIMMER
(PILOTS')
Fuel Quantity Indicating System Component Location
Figure 1 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú

 28-41-02
 QUANTITY INDICATORS  ú ú 01 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 WINGREFUEL PANEL LEADING(P15 PANEL)
EDGE 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

FUELFUEL FUEL
ERRERR ERR
%%%
REFUEL PANEL
G
Fuel Quantity Indicating System Component Location
Figure 1 (Sheet 2)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIMMONDS DIGITAL FUEL ú

 28-41-02
 QUANTITY INDICATORS  ú ú 01 Page 3 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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