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tanks, four electrically operated fuel
pumps, and a vent system with associated
wiring and plumbing. The tanks are secured
using 5K and 10K pound cargo
straps. The fuel management control panel
(FMCP) is housed in an aluminum box
and is mounted on the forward most tank.
Refer to TM 55-1560-307-13&P for installation,
operation, and maintenance procedures.
WARNING
Chains will not be used to tie down the
ERFS.
CAUTION
FMCP will not be operated without fuel in
the tank(s), or with tank cam lever in the
CLOSED position.
CAUTION
A fuel sample is required before the first
flight of the day.
CAUTION
Hot refueling is not recommended.
NOTE
For clarity, the tanks are numbered front to
rear 1,2,3,4. In order to maintain helicopter
CG, suggested tank burn is 4, 1, 3, 2.
4-4-2. Extended Range Fuel System II.
The Extended Range Fuel System II (ERFS II) is an
internal tank fuel system that provides the CH-47D with
the ability to fly for an extended period of time without
having to land for refueling. The ERFS II may be installed
in one, two or three tank applications in addition to the
Forward Area Refuel Equipment (FARE) kit installation.
Through the use of a FARE kit, the CH-47D can also be
used to ferry fuel to forward areas to support refueling
operations of other aircraft and equipment. The system
consists of five functional components: the fuel tank assembly
with fuel and vent hoses, restraint system, ERFS
II Fuel Control Panel, and FARE kit assembly. References
and illustrations provided describe the three tank
and FARE kit installation. Power is supplied to the ERFS
II from the No. 1 DC BUS and No. 1 AC BUS through LH
Utility Receptacles and wiring harness to the ERFS II
Fuel Control Panel. Refer to TM 55-1520-240-23 and tM
1-1560-312-10 for installation and maintenance procedures.
4-4-3. ERFS Capabilities.
a. The ERFS provides up to 2320 gallons, (580 gallons
maximum per tank) of usable fuel for extended
range missions.
b. The ERFS can be installed, operated, removed,
transported, handled, and stored in climatic conditions of
–32C to +52C.
c. The ERFS can be installed and used in a one tank
or multiple tank configuration as the mission requires.
d. Fuel quantity can be accurately monitored in
flight within four percent of the actual quantity using the
liquid level indicators.
e. The ERFS can be refueled using the splash fill or
pressure fill techniques.
f. The system can also be defueled using standard
equipment.
g. The ERFS has redundant fuel feed capability in
all pump/tank combinations.
h. Fuel transfer pump system can operate with
APU, engine, or external power applied.
i. The ERFS can be used as a forward area refueling
equipment (FARE) system, providing 2320 gallons of
fuel for refueling other helicopters.
4-4-4. Fuel Tank Assembly.
The ERFS II fuel tank assembly consists of an outer
aluminum honeycomb and fiberglass shell container,
ballistically self-sealing bladder, plumping module, fuel
hose, vent hose assembly, and ground cable. Each tank
measures 58 inch L x 62 inch W x 64 inch H with the
TM 1-1520-240-10
4-4-2
capacity of 800 to 820 gallons of usable fuel and empty
weight of approximately 607 pounds (fig. 4-4-1). ERFS
II tanks are designed to be loaded and unloaded by four
persons (with restraint system in place) in no more than
10 minutes and require no tools. The tanks should not be
unloaded with any quantity of remaining fuel. When the
tanks are installed there is an aisle up the right side of the
aircraft which is approximately 25 inches wide. The
plumbing module consists of an aluminum access cover
secured to an energy-absorbing aluminum tube or column.
The in-tank plumbing components are attached to
a column in the center of the tank permitting easy removal
and maintenance on components. A 75 psi fuel cap,
dual transfer pumps, fuel quantity probe, fuel sampling
tube, and a fuel pressure switch are the internal parts of
each of the tanks. Refueling the ERFS II tanks is performed
by either the helicopter Single Point Refueling
System or gravity.
a. Fuel Hoses. An interconnecting fuel hose manifold
connects the ERFS II tanks together. A two inch
hose connected at the forward end of the ERFS II fuel
manifold is connected to the helicopter Single POINT
Refueling System in the vicinity of STA 225 on the left
side of the cargo compartment. Fuel transfer hoses connected
at the aft end of the manifold carry fuel to the
aircraft fuel system quick disconnects at STA 380 on both
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