Specifying a Ground Power Unit — 400 Hz, 28 VDC, and the Figures a TOR Usually Leaves Out
How to specify an aircraft ground power unit against standards that can be checked — MIL-STD-704 (115/200 V 400 Hz AC and 28 V DC), ISO 6858:2017, which measures the output at the aircraft attaching connector rather than at the machine's own terminals, and EN 2282. Explains why a line reading 'GPU, 90 kVA' is not yet an order, and how output, number of outlets, power source and tow tractor class are actually decided.
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