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Significant Factors


  1. Vacuum pump failure during flight resulted in the loss of suction to the air-driven gyroscopic instruments.
  2. Erroneous attitude and heading indications from these inoperative flight instruments.
  3. Dark sky conditions with no discernible horizon.
  4. The pilot had limited recent experience flying in conditions of reduced external visual reference.
  5. Inability of the pilot to control the aircraft by sole reference to the remaining flight instruments.
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