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operation.
Gravity filling via a filler point is also provided for the wing and center tanks.
PRESEL
INCR
DECR
CLOSE
START
STOP/
SOV
TEST
MANUALAUTO
OFF
REFUEL
DEFUEL
REFUEL
REFUEL
NOAFT
LEFTCTRRIGHT
OPEN
AFT
MANUAL
CLO
REFUEL/DEFUELPANEL
TOTAL PRESEL
LEFTRIGHT CENTER
AFT
GRAVITY FILL CAP
Grounding
Points
Grounding
Point
Proximity
Sensor
PRESEL
INCR
DECR
CLOSE
START
STOP/
SOV
TEST
MANUAL AUTO
OFF
REFUEL
DEFUEL
REFUEL
REFUEL
NO AFT
LEFT CTR RIGHT
OPEN
AFT
MANUAL
CL
REFUEL/DEFUEL PANEL
TOTAL PRESEL
LEFT CENTER RIGHT
AFT
GX_11_022
Grounding
Point
REFUEL/DEFUEL
ACCESS PANEL
REFUEL/DEFUEL PANEL
P I LOT T R A I N I N G GU I D E
FUEL SYSTEM
11-30 For Training Purposes Only
Sept 04
REFUEL DISTRIBUTION
Refer to Refuel Schematic for component location, recognition, and operation.
All fuel tanks can be refueled either automatically (by the FMQGC) or manually (by
the refuel/defuel panel). The recommended pressure is 50 psig for pressure fueling.
A balance line in each tank is used during refueling to transfer fuel to the most
outboard section of the wing.
The filling sequence of the wing compartment during pressure refueling is as follows:
• Cell 2 is filled directly by the refuel system, fuel flows inboard by gravity into
• Cell 1, which is the inboard section including the feed tank. After inboard cells 1
and 2 are completely filled
• Cell 3 is filled to capacity by overflow of cell 2 fuel through the balance tube
connecting cells 2 and 3
The aft and center tanks will be refueled simultaneously (automatically by the
FMQGC) to maintain center-of-gravity (C of G) limits.
High level sensors installed in each tank automatically close the refuel/defuel SOVs, if
the maximum fuel level capacity is reached. Relief valves augment the normal vent
system to prevent overpressure in case of overfilling a tank.
As with the wing tanks, automatic refueling of the center tank is controlled by the
FMQGC, with automatic shutoff commanded by the high level sensor. Automatic
refueling of the aft tank is controlled by the FMQGC, with automatic shutoff
commanded by the high level sensor.
For Training Purposes Only
Sept 04
11-31
P I LOT T R A I N I N G GU I D E
FUEL SYSTEM
REFUEL/DEFUEL SCHEMATIC
FUEL DISTRIBUTION LINES
LEFT MAIN REFUEL
RIGHT MAIN FUEL
CENTE REFUEL/DEFUEL
AFT REFUEL/DEFUEL
AND MAIN DEFUEL
R
CELL 1 CELL 2 CELL 3
REFUEL
DEFUEL
PANEL
RV
RV
RV
H H
H H
RV
Relief Valve
Crossfeed
Valve
Shutoff Valve to
AFT Tank
Suction Defuel
Check Valve
Balance
Tube
Single Point
Refuel Adaptor
Baffled Ribs
Defuel Shutoff
Valve
Center Tank
Refuel/Defuel Check
Valve
Refuel/Defuel
Manifold
Shutoff Valves
TO
FMQGC
GX_11_023
High Level
Sensor
P I LOT T R A I N I N G GU I D E
FUEL SYSTEM
11-32 For Training Purposes Only
Sept 04
NORMAL FUEL LOADING
The normal fuel loading logic as planned by the FMQGC is as follows: Note that when
the refuel process starts, fuel flows to all of the tanks at the same time until they reach
the planned amount.
• Wing tanks only if the required fuel load is equal to or less than the wing tank
capacity
• Wing tanks full and the remainder in the aft tank if the required fuel load is greater
than the wing tank capacity but less than or equal to the combined capacity of the
wing and aft tanks
• Any fuel in excess of the combined capacity of the wing and aft tanks is placed in
the center tank
NOTE
The fuel computer always strives to keep between 0 and 400 lb
maximum lateral imbalance, regardless of what FMQGC version
we have.
For FMQGC (pre-5), the logic was set to stop fuel loading and
display inhib on the fuel panel as soon as the lateral imbalance
reached 400 lb. Since -5 FMQGC, the software now allows the
imbalance to reach 1100 lb before shutting down and going into
inhib mode.
An additional switch position on the refuel/defuel panel allows auto refueling without
adding fuel to the aft tank.
If the aft tank fueling is inhibited by use of this switch, then the refuel sequence is as
follows:
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