APU OFF then ON B737NG
Hi everyone, was a bit puzzled by a FO practice yesterday and i’m looking for some answer. Parked at the gate, GPU connected, we turned APU OFF. 20’’ after that, GPU just was not delivering anymore for some reason. At that point, FO positionned APU switch to ON and reconnected the busses. I never saw or heard of this procedure. Looked for it in our manuals and found nothing. I understand the logic of being in the automatic cooling period but it still puzzled me. Anyone with some reference on that?