In the days pf lunchtime drinking I remember one captain practically begging for a sortie that afternoon as he needed to fly. He was told no way and that he would only be put on the flypro when the flt cdr was ready.
Duly p1ssed off he went and had a glass of sherbet. About 1330 the FC returned and told him he was now flying a 1600. When he pointed out he had been drinking he was threatened that he would be charged with being drunk on duty and refusing an order.
What to do?
On a Vulcan easy peasey. Every good AEO carried a bunch of U/S fuses in his pencil box or recognised as suspected TRU failure.