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Old 05-18-2016, 02:17 AM   #2 (permalink)
freebeard
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Not previously; but my brain pointed Google to:

Aircraft Electrical Systems - SKYbrary Aviation Safety

Quote:
All aircraft electrical systems have components with the ability to generate electricity. Depending upon the aircraft, generators or alternators are used to produce electricity. These are generally engine driven but may also be powered by an APU, a hydraulic motor or a Ram Air Turbine (RAT). Generator output is normally 115-120V/400HZ AC, 28V DC or 14V DC. Power from the generator may be used without modification or it may be routed through transformers, rectifiers or inverters to change the voltage or type of current.
Emphasis added.
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