It was determined that the accident Catastrophe was caused Causation by a fatigue crack in the main spar of the left wing that caused Causation the outer part of the left wing , outboard of the engine nacelle , to separate Forming_relationships from the remainder of the aircraft .

The accident Catastrophe and related matters were investigated Research by a Supreme Court judge who also found Know that the aircraft 's left wing failed in flight due to a fatigue crack .