A lot more stable than the supply I used, that was 20 tons of rotating motor generator. Voltage regulation was pretty good, and frequency was within 0.5% of nominal, but subject to minor disturbance with step loads of more than 2kW. The ATE had it's own 3 phase 115V precision power supply, and a simple 26VAC transformer to generate the required 26VAC 400Hz reference supply.
There was a discovery that the "Box, electrical protection" in the power bay to the aircraft did not disconnect if you applied, instead of the required 115VAC 400Hz 3 phase delta, 380VAC 50Hz. A mistake made by using the same socket orientation for both supplies, and only having a label next to the 2 otherwise identical sockets on the wall. New apprentice was instructed to "plug it into the socket" with a vague wave at the wall concerned. they then went to lunch leaving the systems to warm up ( needs 10 minutes or so for onboard comps to finish self tests) while connected to the ground cooling unit ( diesel powered, so did not use a power connector, as that is why the sockets were there for the few non motorised units) did its job. Was not me, just an instruction came around to ensure the sockets and cables could not be cross connected in this case.
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