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left and right sides of the cargo compartment.
CAUTION
Up to 4 OZ. of fuel can be trapped between
the closed “Dry Break” valves in the Unisex
couplings. Care should be taken to
minimize spillage of this trapped fuel
when separating the couplings.
b. Vent Hose Assembly. Aircraft overboard vents
and connections are installed on the left side of the cabin
area through the fuselage at STA 254.0, 330.0, and
410.0. Overboard fuel vent caps must be removed anytime
internal fuel tanks are installed. Vent hoses are connected
to the tank vent line at the self-sealing breakaway
valve on the top of the tank assembly and one of the three
aircraft overboard vent connections.
CAUTION
Trying to pressure refuel the tanks without
connecting the vent line could overpressurize
the tanks.
The vent hose assembly allows the venting to atmosphere
of fuel vapor, thus providing vent air to relieve
internal tank pressures. Fuel hoses and manifold are
self-sealing incorporating Unisex couplings. Each Unisex
coupling, ballcock valve, permits hose removal without
fuel spillage. The manifold also provides connection
to the FARE pump module. The fuel/defuel valve is a
manually operated vented valve that simultaneously
opens a high flow rate fuel path in the fuel/defuel line, and
a high flow rate vent path out of the tank. The valve must
be open for pressure refueling of the tanks, FARE operations,
or suction defueling. An automatic fuel shutoff
valve, with dual high level shutoff controls is located inside
the tank. Inside each of the tanks is an open vent
valve to allow fuel to vent overboard in the event of high
level shutoff valve failure.
TM 1-1520-240-10
4-4-3
Figure 4-4-1. ERFS II Fuel Tank
TM 1-1520-240-10
4-4-4
4-4-5. Restraint System.
Each tank restraint system consists of an aluminum
frame and straps of polyester webbing with connecting
hardware and ratcheting buckles. This system provides
longitudinal, vertical, and lateral restraint. The forward,
vertical, and lateral restraint ratings are 8g’s and the aft
rating is greater than 3g’s. Each of the buckles are connected
to twelve 5,000 pound tiedown rings on the helicopter
cargo floor.
4-4-6. ERFS II Fuel Control Panel.
All transfer of ERFS II fuel into the helicopter main fuel
tanks is controlled by the ERFS II Fuel Control Panel (fig.
4-4-2). The control panel is located and mounted on the
forward most ERFS II tank facing forward. It has individual
switches that control the operation of the transfer
pumps and circuit breakers to protect each of the pumps
in the tank. Illumination is controlled by a dimmer rheostat
on the fuel control panel and is night vision goggles
(NVG) compatible. Electrical cables run from cargo
compartment AC and DC utility outlets at STA 358 and
320 to the ERFS II fuel control panel, and from the panel
to connectors on each tank. A fuel quantity gauge is
installed on the panel to provide readings in pounds of
fuel for the individual tanks and their combined total fuel
remaining.
4-4-7. Fuel Transfer to Helicopter Main Tanks.
a. Manual FUEL/DEFUEL valve in all installed
ERFS II tanks – CLOSED.
NOTE
An OPEN manual FUEL/DEFUEL valve on
the transferring ERFS II tank will significantly
reduce the transfer rate because of fuel circulation
inside the tank. An OPEN valve on a
non-transferring tank will result in fuel transfer
into that tank if it is not full.
b. Unisex valves in ERFS II fuel transfer hose assembly
– OPEN.
c. Select the ERFS II tank from which fuel is to be
transferred.
d. PUMP switch for the selected tank – OVERRIDE.
Hold in this position until PRESS LOW light goes out
(normally less than five seconds). When released, the
spring-loaded switch will return to the ON position and
fuel transfer will continue.
e. Monitor the helicopter fuel indicators to verify fuel
transfer.
f. PUMP switch for selected tank – OFF when directed
by the pilot or when the PRESS LOW light illuminates.
g. FUEL QUANTITY switch – Set to 1, 2, or 3 for
selected tank to confirm desired amount of fuel transferred.
4-4-8. Forward Area Refuel (FARE) Kit Assembly.
The FARE kit contains a pump module with a self-priming
pump rated at 120 GPM and Flowmeter. The pump can
be used to either fuel or defuel the ERFS II tanks. The
pump module easily mounts on any one of the tanks
when used. A manually operated valve reverses the fuel
flow and permits defueling of the hoses after FARE operation.
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