Boeing 737 700/800/900 Study Guide
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AC and DC Metering Panel
Forward Overhead Panel  700/800/900
AC Meters Selector on APU GEN

Measured at the APU generator.

When the APU is started using battery power only, there is no
indication on the electrical metering panel that the APU generator
has come on line and is ready to be selected. Both the frequency
and voltage readings are  zero until the APU generator is placed
on line.
Normal AC voltmeter indication for the APU generator with the AC
busses loaded is 110 - 125 volts.
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Click on the AC Meters Selector to advance to the next position.
or
Click on the AC Meters Label to advance to that position.
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