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(Fuel System
Computer Unit)
35%
0%
38%
P604_12_002
to Vent
Manifold
AC
AC
DC
DC DC
AC
FUEL SYSTEM
For Training Purposes Only
May 03
12-27
P I LOT T R A I N I N G GU I D E
Overwing Gravity Refueling
Gravity refueling will average 7% less volume than pressure refueling in the main and
auxiliary tank systems since the main and auxiliary overwing filler points are below
the highest point of the respective tank. Overwing filler caps are installed on each
wing. The auxiliary tank gravity refueling panel and cap are situated on the right wing
root. The tail tank cannot be gravity refueled.
During overwing gravity refueling, the pilots must ensure the
aircraft is within center-of-gravity limits.
NOTE
FUEL SYSTEM
12-28 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Do not open the overwing fueling caps unless the fuel
quantity in the main tanks is below 93% capacity.
Pressure Defueling
• select DEFUEL on the POWER switch
• ensure that the SOV switches of only those tanks that are to be defueled are in the
OPEN position and the remaining SOV switches are in the CLOSED position
• apply suction from the fuel truck (max –8 psi) at the fuel/defuel adapter
When the auxiliary tank or either main tanks are fully defueled, their respective SOV
CLOSED (green) light will illuminate and the associated (white) SOV OPEN light
will extinguish.
When defueling is completed, move the applicable tank SOV switches to CLOSE.
If defueling pressure is applied and the POWER FUEL/DEFUEL
switch is inadvertently selected OFF, fuel will be drawn from the
main and auxiliary tanks only. Any fuel in the tail tank system will
remain trapped, possibly creating a tail-heavy condition.
Gravity Defueling
The main and auxiliary tanks can be gravity defueled through a tank drain valve which
has an integral check valve. The tail cone tank may be drained through the DC motor
operated dump valve.
The tank drain valves are installed on the lowest access cover of each tank, and sealed
from the outside with a screwed-in cover plug. A special adapter is required to operate
the check valve for gravity defueling operations.
CAUTION
NOTE
FUEL SYSTEM
For Training Purposes Only
May 03
12-29
P I LOT T R A I N I N G GU I D E
Controls and Indicators
FUEL Control Panel
FUEL Control Panel
Figure 12-18
ON
FAIL
MANUAL
AUTO
INHIB
ON
FAIL
FUEL
BOOST PUMP
XFLOW
TAIL TANK TRANSFER DUMP
L TO AUX GRAVITY R TO AUX
PRI MANUAL
OVRD
SEC DUMPS AT 0º
FLAPS ONLY
L R
ON
INOP
ON
INOP
ON OPEN ON
OPEN
FAIL
L TO AUX /
R TO AUX
XFLOW
Switch/Light
ON Light
Controls gravity
transfer to
Auxiliary Tank
Indicates transfer
valve is open
BOOST PUMP Switch/Light
INOP Light
ON Light
Operates both electric fuel boost pumps upon
loss of respective main ejector output pressure
Indicates pump outlet pressure too low
Indicates pump outlet pressure is satisfactory
DUMP
Switch/Light
(guarded)
FAIL Light
OPEN Light
Operates tail
tank dump valve
Dump valve is in
disagreement
with switch
selection
Dump valve
open
GRAVITY
XFLOW
Switch/Light
OPEN Light
Controls gravity
crossflow valve
Gravity crossflow
valve is open
MANUAL OVRD Switch/Light (guarded)
AUTO INHIB Light
MANUAL Light




Used alone to stop auto tail tank fuel transfer
Used with respective primary/ secondary switch to
manually start primary/ secondary tail tank transfer
pump
Indicates rotor-burst protection cylinder nitrogen
pressure low. Automatic mode is disabled.
Indicates switch pushed in
TAIL TANK TRANSFER Switch/Light (guarded)
FAIL Light
ON Light
Operates primary or secondary tail transfer pump
when in manual override mode
Indicates pump outlet pressure too low in manual
mode due to pump failure, or completion of manual
fuel transfer
Indicates satisfactory output pressure from pumps in
the manual mode
P604_12_004
FUEL SYSTEM
12-30 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Fuel Quantity Indicators
Fuel quantity is displayed in the lower left corner of the EICAS primary page. The
sum of all tanks is displayed next to the word TOTAL. The next line indicates,
　
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