CSP−900RMM−2MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 1
Revision 34
28-00-00
FUEL SYSTEM
DESCRIPTION AND OPERATION
1. Fuel System
(Ref. Figure 1)
The fuel system stores and distributes fuel to
the engines. The fuel system is designed for
maximum safety so no single failure can result
in fuel starvation. The fuel system has been
designed to maximize safety by isolating and
sealing the fuel sources. All fuel lines and
valves are enclosed in a shroud system that is
connected to an overboard drain. The shroud
and drain systems and isolate fuel leaks from
the helicopter and drain the leaking fuel
overboard.
The fuel system consists of the Fuel Storage
Subsystem and the Fuel Distribution Subsys
tem.
2. Fuel Storage Subsystem
The fuel storage subsystem stores and
monitors fuel available for operation of the
engines. Fuel is carried in a bladder type fuel
cell located below the cabin compartment floor.
Access to the fuel cell is provided by removable
floor panels. The cell is supported by the
passenger compartment floor, fuselage
structure, and special fasteners.
The fuel storage subsystem consists of the
following components:
Fuel Cell - Stores fuel for operation of the
engines.
Fuel Vents - Vent fuel cell vapors to the
atmosphere.
Filler Port - Provides a service point for
refueling or defueling during maintenance
operations.
Fuel Drain Valves - Provides a manual drain
for the fuel cell at the lowest point in the fuel
storage system.
Fuel Quantity Probes - Monitors fuel
quantity level and provides an electrical signal
to the Integrated Instrument Display System
(IIDS).
A. Fuel Cell
The fuel cell is a crash-resistant bladder type
cell.
Fuel cell capacity without range extender is
1014 lb (460 kg)(149.0 US gallons (564.0
liters)) of fuel, 994 lb (451 kg)(146.2 US
gallons (553.4 liters)) useable fuel.
Fuel cell capacity with range extender is
1097 lb (498 kg)(161.2 US gallon (610.2
liters)) of fuel, 1078 lb (489 kg)(158.5 US
gallons (600 liters)) useable fuel.
The cell is constructed of a two-ply layer of
flexible, high tenacity Nitrile-coated woven
nylon fabric, coatings, adhesive, and a nylon
film barrier. The internal ply of Nitrile-coated
fabric contains the fuel and provides internal
protection of the nylon film barrier. The film
barrier keeps fuel from diffusing through the
fuel cell wall. The outer ply of Nitrile-coated
fabric provides external protection to the film
barrier.
The inside of the fuel cell, is divided by two
lateral baffles which reduce fuel sloshing
during changes in flight attitudes. The baffles
have openings across their face to allow fuel to
pass through them. This reduces the load on
the baffles and provides even fuel distribution
within the cell. A baffle is installed longitudi
nally between the boost pumps. The baffle
evenly distributes fuel to each fuel booster
pump. 902 CONFIG - The longitudinal baffle
is the full length of the fuel cell. The baffle
separates the fuel cell into left and right
cavities to isolate 20 minutes of fuel to each
engine in critical flight attitudes. The fuel cell
is equipped with four access cover openings
which allow access to the fuel booster pumps
and fuel quantity probes.
Fuel cell support ribs are installed laterally
between the fuel cell and the forward and aft
lower fuselage cavities of the fuselage struc
ture. A liner panel assembly installed over the
ribs contours the fuel cell. Two fuel cell cavity
foam supports installed on the aft outboard
portion of the liner support the aft outboard
portion of the fuel cell. In the event of a fuel
leak, the support ribs prevent fuel from being
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