The crew departed Loring AFB on a training flight. While cruising by night along the US-Canada border, the aircraft suffered an explosion, entered a dive and crashed in an open field located in Carlingford, New Brunswick. The aircraft was destroyed and all four crew members were killed.
Probable cause (official findings): A fuel pump go dry and ignited fuel vapor after becoming overheated. Fifth KC-135 accident due to similar causes. At least 1,500 liters of fuel must remain in all tanks to avoid fuel pump overheating.