K-dot-B
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K-dot-B's post in What does the PT-125Ts inverter supply? was marked as the answer
It supplies the 36 VAC systems if both 36V transformers fail. In an emergency 36VAC is supplied from the inverter to the main and standby attitude indicator, vertical gyro no.2 and the "gyro correction cutout switch". Section 2-69 in the Cold War Air Museum's manual has a lot of info on this.
I think it's mostly an emergency solution, and that's why it's never mentioned in normal operations.