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FWD. When the valve is closed, all motive flow
transfer in the aft fuselage is shut off. If the valve
is closed because.of the L FUEL PRESS caution
light, positioning the FEED switch to AFT will
open the valve.
4. Wing motive flow shutoff valve - The motive
flow to eachw ing passest hrough separatep athsi n
a single motive flow shutoff valve. The valve is
normally open except when:
a. The WING/EXT TRANS switch is in OFF or
in AUTO with both left and right wing thermistors
dry.
b. Weight is on wheels.
C. The REFUEL PROBE switch is in ALL EXTD.
In any case, the wing motive flow shutoff valve can
be commanded open by selecting ORIDE on the WING/
EXT TRANS switch.
2.14.4.2 Fotward Fuselage Transfer. Fuel in cell
No. 1 flows by gravity into cell No. 2 where two motive
flow ejector pumps transfer it into the right wing boxbeam
tank at approximately 18,000 pounds pph. Fuel
entering the box-beam tank beyond engine demands
overflows through an overflow pipe back into cell
No. 2. There is no fuel level control associated with
fuselage motive flow transfer; therefore, the fuel will
continue to circulate from cell No. 2 into the right boxbeam
tank and back through the overflow pipe. When
the fuel in cell Nos. 1 and 2 is depleted, the motive flow
ejector pumps are shut off by their own low-level floats,
In the event of failure of the forward fuselage motive
flow, the fuel can reach the right sump tank by gravity
flow through interconnect D.
2.14.4.3 Aft Fuselage Transfer. Fuel in the aft fuselage
is transferred forward by scavenge ejectorpumps
in cell No. 8 and the vent tank, single ejector pumps in
cell Nos. 6 and 7, and two ejector pumps in cell No. 5.
All atl motive flow transfer is into the left box-beam
tank, producing a rate of approximately 36,000 pph.
This flow rate is approximately twice that ofthe forward
fuselage transfer rate because there are more motive
flow ejector pumps in the aft transfer system. More fuel
tanks and thus more motive flow ejector pumps are
required in the aft transfer system than the forward transfer
system because of the aircratl structural contigumtion.
Like the forward fuselage, aft fuselage transfer
doesn ot have any high-level control associatedw ith it.
NAVAIR 01 -F14AAD-1
Excess fuel in the box-beam tank passes through an
overflow pipe back into cell No. 5. When cell No. 5 is
full, the fuel cascadesin to cell Nos. 67, and 8. The at?
fuselagef uel will continuet o circulateu ntil consumedb y
the engine. When their respective cell is empty, the motive
flow ejector pumps will be shutoff by their own
low-level floats. The scavenge ejector pumps do not
incorporate shutoff floats. In the event of loss of aft
fuselage motive flow transfer, fuel may be gravity fed
forward to cell No. 5 and eventually to the lefi sump tank
through interconnect C.
2.14.4.4 Wing Transfer. Wing fuel is transferredb y
two motive flow ejector pumps located in each wing. To
prevent overfilling the fuselage, entry ofwing fuel into
the box-beam tank is controlled by the refuelingAmnsfer
shutoff valve. In the forward fuselage, excess fuel overflows
through an overflow pipe from therightbox-beam
tank into cell No. 2, and then cascades into cell No. 1.
A high-level pilot valve senses when cell No. 1 is full
and sends a signal to close the right refuelingltransfer
shutoff valve, preventing additional wing fuel from entering.
When engine fuel consumption provides room in
cell No. 1 for additional fuel, the high-level pilot will
signal the refueling/transfer shutoff valve to open. The
sequenceis identical for the left box-beamt ank and aft
fuselage with the exception that the high-level pilot
valve is located in cell No. 7 and controls the let?
refueling/transfer shutoff valve (see Figure 2-34 for
wing and external tank fuel transfer).
Normally wing fuel can only transfer to the box-beam
tank on its respective side, except when the thermistor in
either cell No. 2 or 5 is uncovered or the FEED switch is
selected FWD or AFT. For either condition, the motive
flow isolation valve opens, making motive flow pressure
available to either wing from either engine and the two
defuektransfesr electorv alves openp ermitting fuel from
either wing to transfer to either box-beam tank. Total loss
of wing motive flow will preclude transfer of any
remaining wing fuel. Failure of either high-level pilot
valve or refueling/transfer shutoff valve to the closed
position could cause a single-wing transfer failure. Selection
of FWD or AFT on the FEED switch opens the
　
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