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No. 1 PDP. When the switch is at CLOSE, electrical power
closes the valves.
2-4-5. Fuel Valves.
There are two engine and two crossfeed fuel valves.
a. Engine Fuel Valves. One engine fuel valve (fig.
2-4-2) is in the fuel supply line to each engine. The valve
is electrically operated by the FIRE PULL handles and
manually by a lever on the valve. They are located at sta.
498 and labeled FUEL VALVE # 1 ENGINE and FUEL
VALVE # 2 ENGINE.
b. Crossfeed Fuel Valves. The crossfeed fuel
valves connects the No. 1 and No. 2 engine fuel lines.
When the valve is opened, both engine fuel feed lines are
interconnected and fuel can be supplied from both fuel
tanks to feed either engine or from either tank to feed
both engines. Fuel cannot be transferred between tanks.
The valves are electrically operated by the XFEED
switch on the FUEL CONTR panel or manually by a lever
on the valve. They are labeled FUEL VALVE CROSSFEED
and located at station 504.
c. FUEL VALVE WARNING LIGHT. There are two
PRESS-TO-TEST FUEL VALVE WARNING LIGHT next
to each FUEL VALVE CROSS FEED
Figure 2-4-2. Engine Fuel Valves, Sta. 498
and two PRESS-0TO-TEST FUEL VALVE WARNING
LIGHT next to FUEL VALVE # 1 ENGINE and # 2 ENGINE
(fig. 2-4-3). They indicate the operating condition
of the individual valve and associated circuitry. Power is
supplied to operate the crossfeed FUEL VALVE WARNING
LIGHT by the No. 1 DC bus through the XFEED
CONT circuit breaker on the No. 1 PDP. Power is supplied
to operate the engine FUEL VALVE WARNING
LIGHT by the DC essential bus through the ENGINE NO.
1 and NO. 2 FUEL SHUT-OFF circuit breakers on the No.
1 and No. 2 PDP.
The following description on when the light will illuminate
is for the XFEED switch. The same result applies to the
engine fuel valves with the FIRE PULL handles.
(1) Each time the XFEED switch is moved from
CLOSE to OPEN or OPEN to CLOSE. After this operation,
the light should extinguish, indicating the crossfeed
valve is synchronized with the switch position.
(2) When a short circuit occurs, causing a signal
to be applied opposite to the valve position. However, the
valve will remain at the position last selected by XFEED
switch.
(3) When the crossfeed valve protection relay
fails. The crossfeed valve will remain at the last selected
position and the valve can be operated electrically or
manually, as required.
TM 1-1520-240-10
2-4-3
2-4-6. Manual Defueling Valve.
A manual defueling valve is in the aft cargo compartment
next to FUEL VALVE # 2 ENGINE. The valve should only
be used by maintenance personnel to defuel the helicopter
or adjust fuel load.
2-4-7. Fuel Quantity Indicator and Selector.
An indicator calibrated to measure fuel quantity in
pounds and seven position selector switch (fig. 2-4-4) is
on the center instrument panel. Power is supplied to the
indicator through the FUEL QUANTITY selector switch
by the No. 1 AC bus through the FUEL QTY circuit breaker
on the No. 1 PDP.
a. FUEL QUANTITY Indicator. The indicator provides
two types of display. One display is in the digital
form and the other is a pointer. The digital readout continuously
indicates the total amount of fuel remaining in all
the fuel tanks. The pointer remains hidden until one of the
tank positions on the FUEL QUANTITY selector switch
is selected. Then, the pointer will indicate fuel remaining
in that tank. The fuel quantity indicator is electrically connected
to 10 capacitance-type measuring units in the
tanks.
b. Fuel Quantity Selector Switch. The fuel quantity
selector switch has seven positions labeled TOTAL, L
(left) and R (right) FWD, MAIN, and AFT. Selecting any
position other than TOTAL causes the indicator pointer
to display the fuel remaining in that tank. The digital readout
is not affected during individual tank readings.
2-4-8. Fuel System Cautions.
Four caution capsules are dedicated to the fuel system.
a. L and R FUEL LOW. Two fuel quantity caution
capsules, one for each main tank, are on the master
Figure 2-4-3. Fuel Valve Warning Light, Sta. 500
Figure 2-4-4. Fuel Quantity Indicator and Selector
Switch
caution panel (fig. 2-14-5) of the center instrument console.
Each light is electrically connected to a thermistor
sensor on a measuring unit in the respective main tank.
These lights are labeled L FUEL LOW an R FUEL LOW.
When the is 20 percent of fuel remaining in the main tank,
the caution capsule for that main tank illuminates (20
percent of fuel is equal to 320 to 420 pounds.) Power for
these capsules is supplied by the DC essential bus
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