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Refer to figure.
Consider the attached aircraft electrical system diagram, assuming that there is no RAT and the APU cannot be used in flight. After a failure of both engines, which of the following will still be available?

1. BAT1 and BAT2
2. DC and AC EMER
3. AC1 and AC2
4. AC ESS bus

  • A
    1, 2
  • B
    1, 2, 3
  • C
    1, 2, 4
  • D
    1

Refer to figure.
Batteries are only used as a last resort, when any other generator fails, the batteries’ current is not to be used under normal operation, and even less to provide current to the generators, the reason why reverse current relays are fitted to the electrical circuits. The amount of current is very limited so in case of emergency, the batteries will only supply a limited number of systems (the most vital).

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