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drop and equalize with the center auxiliary tank. This will cause the level in the center
auxiliary tank to rise, and if the level is high enough, it may trigger the auxiliary tank
HIGH LEVEL SENSOR. If this is the case, the FSCU will not allow the AUX SOV to
reopen, and only gravity refueling will be possible to fill the remaining volume of the
auxiliary tanks.
Auxiliary Tank Quantity Indication
Since the auxiliary tank fuel quantity indication is generated using the center and
forward auxiliary tank capacitance probes, the cockpit reading for the auxiliary tank
during refueling does not immediately reflect actual auxiliary tank contents. Actual
tank contents will only indicate after the three tank levels have equalized
(approximately one to eight minutes later).
Override Button
The override button allows fueling/defueling of the auxiliary or tail tanks individually,
provided the high-level sensor has not been triggered in the selected tank system. The
override button must be held for the duration of individual auxiliary or tail tank
fueling/defueling.
FUEL SYSTEM
12-24 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
IF INDIVIDUAL FUELING OF AUXILIARY OR TAIL TANKS
HAS BEEN CARRIED OUT USING THE OVERRIDE BUTTON,
THE C OF G LIMITS MUST BE CALCULATED MANUALLY.
FUEL / DEFUEL Panel Pressure Refueling
Figure 12-15
WARNING
POWER
FUEL
OFF
DEFUEL
HIGH LEVEL SENSORS
L MAIN TAIL AUX R MAIN
OPEN
SOV
CLOSED
OVERRIDE
SHUT
OFF
TEST
POWER
FUEL
OFF
DEFUEL
HIGH LEVEL SENSORS
L MAIN TAIL AUX R MAIN
OPEN
SOV
CLOSED
OVERRIDE
SHUT
OFF
TEST
P604_12_025
4. OPERATION TEST COMPLETE, RELEASE SHUTOFF TEST BUTTON,
ALL SELECTED TANK SOVs OPEN
6. REFUELING COMPLETE, TURN OFF ALL TANK SOV SWITCHES,
POWER SWITCH OFF
5. AS EACH FUEL TANK REACHES FULL CAPACITY,
THE HIGH LEVEL SENSOR CLOSES THE REFUEL SOV
POWER
FUEL
OFF
DEFUEL
HIGH LEVEL SENSORS
L MAIN TAIL AUX R MAIN
OPEN
SOV
CLOSED
OVERRIDE
SHUT
OFF
TEST
O
FUEL SYSTEM
For Training Purposes Only
May 03
12-25
P I LOT T R A I N I N G GU I D E
Pressure Refueling (Auxiliary Tanks)
Figure 12-16
Denotes signal
to/from Fuel System
Computer Unit (FSCU)
F
A EJECTORS SUBMERGED
Vent
Open
Secondary
Transfer Line
Primary
Transfer Line
Primary
Transfer Line
Fwd Refuel
Ejector
Aft Refuel
Ejector
Secondary
Transfer Line
Vent
Open
F
Fwd Aux
Tank
Vent
Refuel High Level
Shutoff Sensor
Aft Aux
Tank
Vent
Closed
Vent
Closed
F
B FWD AND AFT AUX TANKS FULL
P604_12_013
Vent
Open
Vent
F Open
C LEVELS EQUALIZED
Fueling Pressure
Disconnected
FUEL SYSTEM
12-26 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Refuel / Defuel System Schematic
Figure 12-17
P P
P
LEFT
COLLECTOR
TANK
RIGHT
COLLECTOR
TANK
LEFT
MAIN TANK
RIGHT
MAIN TANK
F
F
F
F
F
F
F
FWD
AUX TANK
AFT AUX
TANK
P
F
TAIL TANK
SUMP
RH
SADDLE
TANK
LH
SADDLE
TANK
Rotor-Burst
Zone
Nitrogen Low
Press Switch
Sec.
To Tail Tank
Vent Outlet
Fuel
Transfer
SOV
CENTER AUX TANK
Aux Tank
Defueling
Inlet
Tank SOV
Tank SOV
Tank SOV
Fwd & Aft Aux
Tank Fueling
Ejectors
(Located at
LH Wing Tip)
(Located at
RH Wing Tip)
Vent
Pipe
Vent
Pipe
Vent
Pipe
To Vent
Manifold
Xfer
Pumps
Vent Pipe
Vent Pipe
Tank
Relief
Valve
Bulk Fuel
Temp
Sensor
Typical
(6 Each)
Typical
(6 Each)
F
F F
F
Tail Tank
Fwd SOV
Tail Tank
F Aft SOV
F
F F
Rotor-Burst
N Cylinder 2
From
Fueling
Truck
Drain
DC
LEGEND
Refuel High-Level
Shutoff Sensor
Xfer O/Fill Sensor
Level Sensor
Fuel Qty Probe
Solenoid Controlled SOV
DC Motor Operated SOV
AC Motor Pump
Low Press. Switch
Signal to FSCU
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