Francistown refueling
Speaking of fork lifting barrels of fuel for over wing refueling years ago in Francistown, remember the DC4 which was refueled with JetA1, a plane load if mine workers destined for South Africa, soon after take off all 4 engines 'coked up', seized, pilots made to return to runway stalled in the turn, crashed. The one survivor, flight engineer dashed from cockpit to tail of aircraft before it struck.
Far as can tell it was never legally established who was at fault, but what were flight engineers duties ?