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loaded to FEED. The pilot TOTAL quantity display and
the RIO display indicate total internal and external fuel.
Note
The RIO fuel quantity indicator is a repeater
of the pilot total fuel indicator. The difference
between the two should not exceed 300
pounds.
2.14.2.2 FUEL LOW Caution Lights. AL FUEL
LOW or R FUEL LOW caution light illuminates with
1,000 i200 pounds of fuel remaining in the respective
feed group. The RIO is provided with a single FUEL
LOW caution light that illuminates with one or both of
the pilot FUEL LOW caution lights.
Each FUEL LOW caution light is illuminated by two
thermistors operating in series. One set of thermistors is
in the right box-beam tank and cell No. 2. The other set
of thermistors is in the left box-beam tank and cell No.
5. The FUEL LOW light illuminates only if both thermistors
operating in series are uncovered.
If the thermistors in either cell No. 2 or
No. 5 remain covered during a fuel transfer
failure, it is possible topartially deplete
the sump tank without illuminating the
respective FUEL LOW caution light.
When both FUEL LOW caution lights illuminate,
less than 1 minute of fuel is
available if both engines are operating in
zone five AB.
If the BINGO CAUTION circuit breaker
(8F6) is pulled, the L and R FUEL LOW
caution lights will be disabled.
2.14.2.3 Fuel Quantity Indication Test. Actuation
of the master test switch in INST causes the fuselage
tapes and total and feed/wing/external fuel quantity indicators
to drive to 2,000 pounds and illuminates the
FUEL LOW caution lights. The test can be performed
on the ground or in flight. The test does not check the
fuel probes or the thermistors. A test of the BINGO set
device can be obtained concurrently with the INST test
by setting the BINGO level at greater than2,OOOpounds.
In this case, the BINGO caution light will illuminate
when the totalizer readingd ecreasesto a value lesst han
the BMGO setting.
2.14.3 Engine Feed. The feedgroupforeachengine
is comprised of a box-beam tank and a sump tank. Each
box-beam tank holds approximately 1,300 pounds of
fuel and is fed from external tank transfer, wing transfer,
and fuselage transfer from cell No. 2 or 5. When a
box-beam tank is full, excess fuel is returned to the
fuselage tanks through an overflow pipe. The sump
tanks, which hold approximately 300 pounds of fuel
each, are located directly beneath the box-beam tanks
and have three sources of fuel (see Figure 2-31 for identification
of tank interconnects):
1. Interconnect A or B provides gravity sump from
the respective box-beam tank.
2. Interconnect C or D connects the sump tank to its
respective fuselage tank (cell No. 4 to cell No. 2/
cell No. 3 to cell No. 5).
3. The sump tank interconnect line and valve E connect
the two sump tanks.
2-43 ORIGINAL
NAVAIR Ol-F14AAD1
Figure 2-30. Fuel Controls and Indicators (Sheet 1 of 3)
ORIGINAL 2-44
NAVAIR ill-Fl4AAD.1
NOMENCLATURE
0 QTY SEL switch
0 FEED switch
0 WlNG/EXl TRANS switch
FUNCTION
WING - Fuel quantity in each wing Is displayed on Land R counter of
pilot’s fuel quantity Indicator.
FEED -
MTFWDNORM
-
(guarded
position)
AFTDRIDE
-
AUTO -
OFF -
Rocker switch spring returns to FEED when not held in WING or
EXT. FEED group fuel quantity displayed on L and R counter of
pilot’s fuel quantity indicator.
Fuel quantity in each external tank displayed on Land R
counter of pilot’s fuel quantity Indicator.
Both engines feed from right and forward tanks. Opens sump
tank interconnect valve, box beam vent valves, fuselage motive
flow Isolation valve, defuellng and transfer selector valve, and
shuts off motive flow fuel to all afl tank ejector pumps.
Right engine feeds from forward and right tanks. Left engine
feeds from aft and left tanks.
Both engines feed from aft and left tanks. Opens sump tank
Interconnect valve, box beam vent valves, fuselage motive flow
Isolation valve, defueling and transfer selector valves, and
shuts off motive flow fuel to forward tank ejector pumps.
Airborne - Allows transfer of wing fuel, fuselage tank
pressurization, and pressurization and transfer of external tanks
will landing gear down, and with electrical malfunction In
transfer System. Weight on Wheels -Allows transfer of wing and
external tank fuel.
A&borne - Normal position. Wing fuel Is automatically
transfened. Transfer of external fuel and fuselage pressurization
Is automatic with landing gear retracted. Automatic shut off of
　
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