CSP−900RMM−2MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 1
Revision 19
28-10-00
SUPPLEMENTAL FUEL SYSTEM (OPTION)
DESCRIPTION AND OPERATION
1. General
(Ref. Figure 1)
The supplemental fuel system installs an
auxiliary fuel tank of thirty U.S. gallons
(113.56 liters) underneath the baggage floor.
The tank is filled through a gravity fill port
located on the right side of the helicopter,
approximately two feet (0.61 M) aft of the
cabin door opening, and approximately five
inches (0.127 M) above the baggage floor.
2. Supplemental Fuel Tank Installation
(Ref. Figure 1)
The area within the boattail tub, aft of FS
230.5, between the LH and RH keel beams,
and under the baggage floor is sealed to
provide a fuel and vapor tight fuel cell cavity.
Blocks of rigid closed cell foam are installed in
unused areas to provide support for the fuel
tank on the sides and bottom.
The top of the supplemental tank is supported
by an aluminum hat support which is bolted to
the fuel tank access cover. The hat support is
bolted at FS 230.5 and FS 257 to aluminum
gusset supports which are attached by rivets.
The fuel tank is attached by bolts to the RH
keel beam at the filler neck attachment.
3. Supplemental Fuel System Fuel Supply
(Ref. Figure 1)
Fuel is transferred into the main tank by an
electrically operated fuel transfer pump
mounted to the bottom of the supplemental
fuel tank with bolts. The fuel pump is con
trolled by a toggle switch mounted in the
cockpit. An indicator light mounted in the
cockpit illuminates when the toggle switch is
in the on position.
Fuel is transferred to the main fuel tank
through a fitting in the aft left vent/rollover
valve mounting plate.
CURRENT CONFIG - A one way check valve
internal to the supplemental fuel tank
prevents fuel from flowing from the supple
mental fuel tank to the main fuel tank when
the transfer pump is not on.
A one way check valve internal to the main
tank prevents fuel from flowing to the supple
mental tank. Main fuel tank fuel level is
controlled by a float activated shut off valve.
The shut off valve is attached to the underside
of the aft LH main fuel tank access panel with
an aluminum bracket and bolts.
The shut off valve allows fuel transfer when
the main fuel tank quantity is less than
ninety-four U.S. gallons (355.83 liters) and
inhibits transfer when the main tank fuel
quantity is greater than one hundred and
eleven U.S. gallons (420.18 liters).
4. Supplemental Fuel System Fuel Vent
(Ref. Figure 1)
The supplemental fuel system vent incorpo
rates a single vent/rollover valve attached to
the fuel tank access cover. This valve allows
venting during normal operation and closes in
a rollover to prevent fuel from draining from
the fuel tank. Aluminum vent tubing is routed
forward and along the front of the supplemen
tal tank to tee into the RH main tank vent
system.
5. Supplemental Fuel System Fuel Quantity
(Ref. Figure 1)
Supplemental fuel quantity is indicated by an
analog fuel gauge mounted on the instrument
panel in the cockpit. The fuel quantity
transducer is a float type and is mounted to
the supplemental fuel tank access cover with
screws.
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