If a manager in almost any major industry were found drunk in the gutter he'd be tossed out out the company as a site safety risk. By "major industry" I mean real jobs like mining / engineering / chemicals / pharmaceuticals / electronics with safety-critical requirements.
Errr, what jumpseater said, plus doesn't that rather depend on whether your hypothetical miscreant was on duty or on his/her own time?
Truck - not sure you meant it this way (surely not?) but you appear to be saying you serviced aircraft whilst badly incapacitated by drink, then go on to offer
'It is a shame that a few let the trade down.
So, that'd be you then?
Outrage bus, all aboard, ding ding....