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Which type of electric power supplies the low pressure pumps of the fuel system on most transport jet aeroplanes?

  • A

    28V AC

  • B

    115V AC

  • C

    115V DC

  • D

    28V DC

Refer to figure.
Nowadays, commercial aircraft electrical system is supplied by two (or more) engine-driven generators regulated in speed by integrated drives. These generators’ characteristics are:

  • 115/200 Volts, 3-phase AC.
  • 400 Hz.
  • 90 kVA.

28V DC is obtained by converting the generators’ output AC via the transformer rectifier units.

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