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switches and the auxiliary tank low pressure indicating
lights are on the FUEL CONTR panel, the fuel line pressure
caution capsules are on the master caution panel,
and the fuel flow meter is on the center instrument panel.
The single point pressure refueling panel and nozzle
adapter are on the right side above the forward landing
gear. Refer to Section XV for fuel tank capacities, fuel
grades, and fuel system servicing procedures.
2-4-2. Fuel Tanks.
The fuel tanks are crashworthy self-sealing tanks with
breakaway fittings. The main fuel lines are constructed
of self-sealing material. Penetration of the tank wall or a
fuel line by a projectile exposes the sealant to the fuel,
activates the sealant, and close the hole.
Breakaway self-sealing fittings are installed where the
main fuel lines connect to the fuel tank and adjacent
structure. Under high impact loads, the fittings shear or
break at predetermined locations, seal themselves, retain
the fuel, keeping fuel loss and post-crash fire hazard
to a minimum. Electrical cables having lanyard-release
type connectors are installed where the cables attach to
adjacent structure. The connectors automatically release
if the fuel tank breaks away from the pod.
Each main tank contains two fuel boost pumps, three fuel
quantity probes, a jet pump for evacuating the pressure
refueling system, a dual pressure refueling shutoff valve,
a dual fuel level control valve, and a gravity filler port.
Each auxiliary tank contains a fuel pump with automatic
shutoff feature, a quantity probe, a dual pressure refueling
shutoff valve, and a fuel level control valve.
Figure 2-4-1. Fuel Control Panel
A rollover vent system is installed in each tank. This
system prevents fuel spillage from the vents should the
helicopter roll over following a crash landing. The vent
system within the tanks have a condensate drain at the
aft end, however, aircraft maneuvering should never
force fuel into the vents. Sump drains are also installed
on the bottom forward end of each tank.
2-4-3. Controls and Indicators.
The fuel controls are the FUEL PUMP switches, XFEED
fuel valve switch, the engine fuel valve, and the manual
defueling valve. Indicators include the crossfeed fuel and
engine fuel valve warning lights, the FUEL QUANTITY
indicator and caution capsules, FUEL flow indicator, AUX
PRESS indicating lights, and FUEL PRESS caution capsules.
Refer to para. 2-4-10 for a description of the pressure
refueling system controls and indicators.
2-4-4. FUEL CONTR Panel.
The FUEL CONTR panel (fig. 2-4-1) consists of eight
two-position fuel boost pump switches, two PRESS-TOTEST
AUX PRESS indicating lights, a two-position
XFEED switch, and a two-position REFUEL STA switch.
a. FUEL PUMP Switches. Each switch controls a
single-speed electrically driven fuel boost pump. Labeled
next to each switch is the name of the pump which
it operates. Each switch has an ON and OFF position.
When one of these switches is at ON, power from the No.
1 or No. 2 DC bus closes the respective pump relay
connecting power from the No. 1 or No. 2 AC bus to
TM 1-1520-240-10
2-4-2
energize the pump. When switch is at OFF, the relay
circuits open and power from the No. 1 and No. 2 AC bus
is de-energized thus shutting off the pump. Power is
supplied for these relay circuits by the No. 1 and No. 2 DC
bus through the LH and RH FUEL PUMP CONT - AUX
AFT, MAIN AFT, MAIN FWD, and AUX FWD circuit
breakers on the No. 1 and No. 2 PDP. Power is supplied
to the pumps circuits by the No. 1 and No. 2 AC bus
through the LH and RH FUEL PUMPS - MAIN FWD,
MAIN AFT, AUX FWD, and AUX AFT circuit breakers on
the No. 1 and No. 2 PDP.
b. AUX PRESS Indicating Lights. Each light is
electrically connected to the forward and aft auxiliary
tank pressure switches. When this indicating light illuminates,
it indicates that the fuel pressure in either the
forward or aft auxiliary fuel line is below 10 1 psi. The
auxiliary tank fuel boost pump switches must be at ON to
provide electrical power to the indicating light. The light
intensity can be adjusted by turning the light housing.
Power is supplied to operate the indicating light by the
No. 1 and No. 2 DC bus through the LH or RH Fuel PUMP
CONT AUX FWD & AUX AFT circuit breakers on the No.
1 and No. 2 PDP.
c. XFEED Switch. The switch electrically operates
two fuel valves in the crossfeed line. The switch has an
OPEN and CLOSE position. When the switch is at
OPEN, power from the No. 1 DC bus opens the fuel
valves through the XFEED CONT circuit breaker on the
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