747 classic about 15 yrs ago. I lean forward to adjust the thrust levers and then turn back to find that the angelic looking child visitor has switched off the two boost pumps from no.4 main and is starting on no.3 main. I suppose he just had to know whether a JT9D would gravity feed at FL350.
All visitors should be accompanied by a member of Cabin Crew at all times.
Regards
Exeng