.
center fuel tank quantity greater than 726 kgs; and
YA613 - YC413, YK101 - YK104
.
both center fuel tank pumps producing low or no pressure
YD651 - YD655
.
both center fuel tank pump switches positioned OFF The quantity arc and digits on the center tank fuel quantity indicator turn amber.
Display remains until –
.
both engines not running
.
center fuel tank quantity less than 363 kgs
YA613 - YC413, YK101 - YK104
. one center fuel tank pump producing high pressure
YD651 - YD655
. one center fuel tank pump switch ON The quantity arc and digits on the center tank fuel quantity indicator return to normal.
Fuel Imbalance (IMBAL) Alert
Displayed (amber) –
.
main tanks differ by more than 453 kgs
.
displayed below main tank with lower fuel quantity
.
inhibited when airplane is on ground
.
inhibited by fuel LOW indication when both indications exist
.
displayed until imbalance is reduced to 91 kgs The fuel quantity arc and digits on tank with lower fuel quantity turn amber
Copyright . The Boeing Company. See title page for details.
12.10.6 June 1, 2005
Fuel -Controls and Indicators
737 Flight Crew Operations Manual
Fueling / Defueling / Measurement
1 2
3 (multiple wing locations) 4 5 7 6
RIGHT WING LEADING EDGE
Copyright . The Boeing Company. See title page for details.
March 28, 2005 12.10.7
Fuel -Controls and Indicators 737 Flight Crew Operations Manual
Fuel Measuring Stick
Allows comparison of fuel quantity or weight as determined from measuring stick reading and fuel weight indicated by fuel quantity indicators:
.
six fuel measuring sticks are installed in each main tank and four are
installed in center tank
.
reading is obtained by withdrawing measuring stick from tank and
latching it magnetically to an internal float. Fuel depth is read where stick
passes through wing skin.
Manual Defueling Valve
Open – interconnects engine feed system and fueling station for:
.
defueling
.
ground transfer of fuel. Closed – isolates engine feed system from fueling station.
Fueling Receptacle
Hose connection receptacle for single point fueling.
Solenoid Override
Mechanically opens solenoid operated valve. Fuel valve opens if fuel pressure is available.
Fueling Valves
With the battery switch ON, and the refueling door open, fuel pressure opens
valve.
Refueling Power Control Relay
Door closed – proximity sensor deactivates power to fueling system.
Door open – the fueling system is powered and panel lights illuminate.
Test Gages & Fueling Panel
Copyright . The Boeing Company. See title page for details.
12.10.8 March 28, 2005
Fuel -Controls and Indicators
Test Gages and Fueling Panel
YA721, YA722, YC153, YC154, YK101 - YK104
RIGHT WING LEADING EDGE
YA613 -YA687, YA801 -YA809, YC411 - YD655
RIGHT WING LEADING EDGE
FUELING INDICATION TEST SWITCH
(spring–loaded to OFF position)
TEST GAGES – checks operation of fuel quantity indicators.
FUEL DOOR SWITCH BYPASS – energizes fueling panel if refueling power
control relay fails.
Fueling VALVE POSITION LIGHTS
Extinguished –
.
fueling valve switch is OPEN and related tank is full
.
fueling valve switch is CLOSED. Illuminated (blue) – fueling valve switch is OPEN and related tank is not full.
Copyright . The Boeing Company. See title page for details.
Fuel -Controls and Indicators 737 Flight Crew Operations Manual
Fueling Valve Switches
OPEN – energizes fueling valve in related tank. CLOSED – de–energizes fueling valve in related tank.
FUEL Quantity (QTY) Indicators
Indicates total usable fuel tank quantity in related tank.
Fuel Quantity Selectors YA613 - YA687, YA801 - YA809, YC411 - YD655
Rotate – sets total fuel quantity desired in related tank.
Copyright . The Boeing Company. See title page for details.
12.10.10 June 1, 2005
737 Flight Crew Operations Manual
Introduction
The fuel system supplies fuel to the engines and the APU. Fuel is contained in three tanks located within the wings and wing center section.
Refer to Chapter 7, Engines, APU, for a description of the engine and APU fuel systems.
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