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wing tank until it is at or above 97%
• When the center tank empties, wing tank continue to burn
• When either wing tank reaches 4,000 pounds, fuel transfers from the aft tank
• Once the aft tank is empty, the wing tanks will continue to burn the remaining
fuel
For Training Purposes Only
Sept 04
11-19
P I LOT T R A I N I N G GU I D E
FUEL SYSTEM
Engine Feed System Indication
The left FUEL synoptic page below represents the normal engine start mode of
operation. The right engine is started using the Auxiliary Power Unit (APU) as the
source of electrical power and left engine is off. The right Fuel synoptic display
represents the right engine on speed.
The FUEL synoptic page below represents airplane configuration with the APU shut
down, both engines on, the AC pumps running, and the DC pumps on standby.
P P P
P
P P
P
P P
P
FUEL
AUX
23°C
APU
23°C
TOTAL FUEL
384OOLBS
146OOLBS
AUX
92OOLBS
146OOLBS
FUEL USED
3OOLBS
LO PRESS
32°C
OLBS
32°C
LO PRESS
P P P
P
P P
P
P P
P
FUEL
AUX
23°C
APU
23°C
TOTAL FUEL
384OOLBS
146OOLBS
AUX
92OOLBS
146OOLBS
FUEL USED
3OOLBS
LO PRESS
32°C
OLBS
32°C
LO PRESS
GX_11_013
P P P
P
P P
P
P P
P
FUEL
AUX
23°C
APU
23°C
TOTAL FUEL
384OOLBS
146OOLBS
AUX
92OOLBS
146OOLBS
FUEL USED
3OOLBS
LO PRESS
32°C
OLBS
32°C
LO PRESS
GX_11_014
P I LOT T R A I N I N G GU I D E
FUEL SYSTEM
11-20 For Training Purposes Only
Sept 04
TRANSFER SYSTEM
Fuel contained in the center tank and the aft fuselage tank cannot be fed directly to the
engine, but must be first delivered to the feed tanks by the transfer pumps. The normal
sequence of fuel usage is to transfer center tank fuel into the wings as required, to keep
the wings full during climb and cruise while holding the aft fuselage tank full.
After depletion of center tank fuel quantity, fuel continues to be burned from the wing
tanks until 5,500 lb. of fuel remains in either wing tank, at which point, transfer of fuel
from the aft tank to the feed tanks is initiated. The transfer from the aft tank is then
continuous until the aft tank is empty. When the aft fuselage tank fuel is depleted, no
further transfer of fuel is required, since all remaining fuel is contained in the wing
tanks.
Control of fuel transfer from the center and aft tanks is normally under control of the
fuel computer. Manual override is provided to command transfer of aft tank fuel into
the feed tanks via the fuel control panel. There is no manual override for the center
tank transfer system.
Airplanes which do not incorporate fuel recirculation.
The engine fuel burn sequence is as follows:
After depletion of center tank fuel quantity, fuel continues to be burned from the
wing tanks until 4,000 pounds of fuel remains in either wing tank, at which point,
transfer of fuel from the aft tank to the feed tanks is initiated. The transfer from
the aft tank is then continuous until the aft tank is empty. When the aft fuselage
tank fuel is depleted, no further transfer of fuel is required, since all remaining
fuel is contained in the wing tanks.
For Training Purposes Only
Sept 04
11-21
P I LOT T R A I N I N G GU I D E
FUEL SYSTEM
CENTER TRANSFER
Fuel transfer from the center tank to wing tank is completely automatic through the
control of the FMQGC. The FMQGC monitors the fuel level and quantities in the
wing tank (using fuel probes, compensators, densitometers, and temperature sensors)
to control fuel transfer from the center tank to the wing tanks. Fuel will be transferred
from the center tank and delivered to the wing feed tanks, through the use of two
center transfer pumps.
The FMQGC will start the applicable center transfer pump(s) when each individual
wing tank reaches approximately 93% of its fuel tank capacity. The FMQGC will
automatically stop the center transfer pump(s) when the respective wing tank reaches
greater than 97%, of its fuel tank capacity.
The FUEL synoptic page represents the center tank transfer system in operation, with
both engines running.
WING TRANSFER
The wing transfer system permits fuel to be pumped from either side of the airplane to
the other, using the DC auxiliary pumps and motor operated shutoff valves.
　
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