Holy Ghost! Reminds me of an An-124 in the very early nineties, enroute from Singapore to (I think) Melbourne with a load of tractors. On departure, in the early hours of the morning, the thing ran from threshold to threshold on an 11,000 foot runway and finally lurched into the air. The controller on duty was mortified that the said airframe refused to climb, departed controlled airspace at the edge of the control zone and didn't make it back into controlled airspace until around 100 miles south-east on the track that went to overhead Tindal. Fortunately, lowest-safe up there is around 1500' for a long way from the field. God knows what the result would have been if there was any terrain.