Accident Details
Pilots were conducting an NDB approach to an uncontrolled airport with an elevation of 941 feet above mean sea level. The NDB was located 1.8 nautical miles from the airport. The minimum descent altitude (MDA) to be maintained until the runway was in sight was 1,540 feet.
Prior to the accident, air traffic control informed the pilots that they were 15 miles from the airport. About four miles from the airport, the airplane struck the top of a hill at an elevation of 990 feet MSL. The impact and subsequent fire demolished the airplane.
Weather Conditions
Estimated weather at the time included an overcast ceiling of 300 feet and visibility of one mile. The source noted that the lack of a local altimeter setting increased the MDA by 240 feet.
Probable Cause
The official probable cause was: "Improper IFR procedure by the pilot by not maintaining the minimum descent altitude (MDA) for that segment of the approach. Factors related to the accident were: darkness, low ceiling, fog, and rain." No mechanical malfunctions were reported or discovered.
Additional Information
ATC had advised the pilots of their position relative to the airport. The airport was uncontrolled, and the approach relied on NDB navigation. The circumstances of the accident indicate a descent below the MDA during the approach.