Boeing 737 700/800/900 Study Guide
Display Selector
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Battery Switch

OFF –

  • Removes power from battery bus and switched hot battery
    bus when operating with normal power sources available.

  • Removes power from the battery bus, switched hot battery
    bus, DC standby bus, static inverter, and AC standby bus
    when the battery is the only power source.

ON (guarded position) –

  • Provides power to the switched hot battery bus.

  • Energizes relays to provide automatic switching of the
    standby electrical system to battery power with the loss of
    normal power.
AC and DC Metering Panel
Forward Overhead Panel  700/800/900
DC Meters Selector
AC Meters Selector