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Which type of electric power supplies the low pressure pumps of the fuel system on most large helicopters?
  • A
    28 V AC
  • B
    115 V AC
  • C
    115 V DC
  • D
    28 V DC

Refer to figure.
On large helicopters, each fuel tank has two Low Pressure (LP) booster pumps.

Booster pumps are low pressure centrifugal pumps, located in feeder boxes at the bottom of the fuel tanks, supplying the fuel at between 20 and 100 PSI. The system is designed to deliver more fuel than the engines require.

The pumps are electrically powered from the helicopter's 115V AC supply. Each pump is supplied from a different AC bus bar, so a single generator failure will only affect one pump in each tank.

Some helicopter operate DC fuel pumps.

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