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Wing and edema\ tanks when empty.WelgM on Wheels
-Automatic transfer of wing and external tank fuel cannot be
accomplished; switch must be set to OAIDE for wing fuel
transfer.
Closes solenoid operated valve to shut off motive flow fuel to
wing and also inhibits external tank transfer and fuselage
pressurization. Spring return to AUTO when master test switch
Is actuated in INST. and when either thermistor in cell 2 and 5 is
uncovered, when DUMP Is selected, and when REFUEL
PROBE switch is In ALL MTD.
Illuminates whenever probe cavity forward door Is open during retraction or
extension of probe.
OFF - Dump valve closed.
DUMP - Opens a solenoid operated pilot valve, which ports motlve flow
fuel pressure to open the dump valve and allows gravity fuel
dump overboard from cells 2 and 5. Wing and external tank
transfer automatically Initlated. Dump electrically inhibited with
weight on wheels or speed brakes not fully retracted.
Figure 2-30. Fuel Controls and Indicators (Sheet 2 of 3)
2-45 ORIGINAL
NAVAIR 01.Fl4AAD1
NOMENCLATURE FUNCTION
@ REFUEL PROBE switch ALL DCTD - Extends refueling probe. Shuts off wing and external tank fuel
transfer to permit refueling of all tanks. Returns transfer switch
from OFF to AUTO.
FUS EXTD - Extends refueling probe. Normal transfer and feed. Used for
practice piugins, fuselage-only refueling, or flight with
damaged wing tank.
RET- Retracts refueling probe.
0
Left and right FUEL SHUT
OFF PULL handles
Pulling respective handle manually shuts off fuel to that engine. Push forward
resets englne fuel feed shutoff valve to open.
09 L and R FUEL LOW caution Fuel thermistors uncovered in aft and left or forward and right feed group.
lights (Also single light on iliuminates with approximately 1 ,ooO pounds remaining in individual feed
RIO CAUTION panel.) group and the respective fuselage tanks empty.
@ BINGO caution light iiiuminates when total fuel quantity indicator reads lower than BINGO counter
value.
010 Land R FUEL PRESS indicates insufficient discharge pressure (less than 9 psi) from respective
caution lights turbine driver boost pump.
Figure 2-30. Fuel Controls and Indicators (Sheet 3 of 3)
The proportion of fuel supplied to each sump tank
through the five interconnects (A through E) is a function
of the pressure differential existing at each of the
interconnects. The interconnect with the highest pressure
differential will provide the most fuel. Valve E is
commanded open during low-fuel states and during fuel
balancing when the FEED switch is selected FWD or
AFT.
In a normal sequencet,h rees ituationsc an be defined
1. Situation 1
a. Fuel in cell Nos. 2 and 5
b. FEED switch in NORMAL
c. Normal engine fuel flow (MIL thrust or less).
Under these conditions, the sump tank interconnect
valve is closed, and the left and right systems are
isolated. The transfer capacity into the box-beam
tank exceeds the engine demand, ensuring a full boxbeam
tank. The pressure head at interconnect A or B
created by the higher vertical location of the fuel in
the box-beam tank, is greater than that created at
ORIGINAL 2-46
interconnect C or D by the fuel in either cell No. 2 or
5. Therefore, fuel to replenish the sump tanks will
come from the box-beam tanks through interconnects
A and B.
2. Situation 2
a. Fuel in cell Nos. 2 and 5
b. FEED switch in NORM
c. High-engine fuel demands (afterburner).
Under these conditions the sump tank interconnect
valve is closed and the left and right systems are
isolated. Engine fuel demand can exceed the transfer
rate into the box-beam tank. If this occurs, the fuel
level in the box-beam tank will start to drop; however
the box-beam tanks are not vented, resulting in a
pressure drop above the declining fuel level. This
reduced pressure lowers the total pressure at A and
B, below the pressure at C and D. Therefore, the
majorityofthe fuel to replenish thesump tankscomes
directly from fuselage cell Nos. 2 and 5 through interconnects
C and D, respectively. The reduction in
box-beam tank fuel quantity should not normally
NAVAIR Ol-F14AAD.1
Figure 2-3 1. Engine Fuel Feed
2-47
NAVAIR 01-Fl4AAD-1
result in a feed group quantity indication of less than
1,200 pounds. If the feed groups drop and then hold
in the 1,200-pound range during a high-speed dash,
the system is working normally.
3. Situation 3
a. Fuel in either cell No. 2 or 5 has been depleted.
b. FEED switch in NORM.
c. Any normal engine demand.
When the low-level thermistor in either cell No. 2 or
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F-14D 飞行手册 Flight Manual 1(80)
