Helicopter Fuel Systems
Figure 1.7 illustrates a typical fuel system found in a light turbine powered helicopter. This system incorporates, a single bladder type fuel cell, located below and aft of the rear passenger seat. Installed in the fuel cell are two submersible centrifugal-type boost pumps, an upper and lower fuel quantity indicating probe, and a solenoid operated sump drain.
The boost pumps are connected so that their outlet ports join to form a single line to the engine. Either pump is capable of supplying sufficient fuel to operate the engine. Check valves are installed at the outlet of each pump, and a pressure switch located in the outlet port of each pump will illuminate the FUEL BOOST CAUTION LIGHT in case of a pump failure.
An electrically operated shut-off valve is installed in the fuel line running from the tank to the engine. A fuel selector valve is not necessary because only one tank is used in this system.
Fuel is filtered twice before entering the engine, and each filter is equipped with a warning light to indicate filter- clogging. Additional provisions are made in the system for a fuel pressure gauge, vent system and a fuel quantity indication.
Figure1.7: Fuel system schematic for light turbine powered
helicopter.
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