The probable cause of the accident was determined to be the failure of the propeller due to undiscovered
metal fatigue in one blade resulting from corrosion from chlorine. Two previous failures of the same type of propeller had occurred, but those aircraft had been able to land safely. The failed propeller blade had undergone scheduled
ultrasonic testing on May 19, 1994, which resulted in its rejection and removal from the propeller. The blade had been sent to a Hamilton Standard facility, where it was subject to refurbishing work that was incorrectly performed. The propeller blade was then installed on the propeller fitted to the aircraft on September 30, 1994. The
National Transportation Safety Board (NTSB) criticized Hamilton Standard, which had maintained the propellers, for "inadequate and ineffective corporate inspection and repair techniques, training, documentation, and communication", and both Hamilton Standard and the
Federal Aviation Administration for "failure to require recurrent on-wing ultrasonic inspections for the affected propellers". The overcast skies and low cloud ceiling at the crash site also contributed to the severity of the crash. ==Aftermath==