A Boeing 747 lost all control in the air for 32 minutes in 1985, after the aft pressure bulkhead of the plane ruptured. The blast ripped away the tail cone, the auxiliary power unit, and a major portion of the vertical stabilizer, which severed all four hydraulic systems powering the 747's control surfaces. The crew managed to keep the plane flying for an astonishing 32 minutes. This incident was part of an ongoing investigation into the origin of the faulty repair on the Boeing 747. The author suggests that the crew may not have been able to control the plane for nearly an hour.