On April 22, 2000, a Beech N35 (registration N1253Z) was involved in an aviation accident near Conicville, VA. Investigators recorded the probable cause as: The pilot's in-flight decision to continue flight into IMC conditions, and his failure to maintain control of the airplane. Factors related to the accident were the failure of the vacuum pump and the pilot's lack of recent instrument time. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
An aircraft broke apart and crashed after the pilot reported a gyro failure while in cruise at 9,000 feet. The pilot had limited recent instrument experience, and a vacuum pump drive shaft showed signs of torsional overstress.
Incident Overview and Pilot Reportage During cruise flight at 9,000 feet, the pilot contacted air traffic control (ATC) to report a gyro failure. The pilot stated that the artificial horizon was inoperative and that only the compass and airspeed indicator remained available. The pilot also indicated a need to remain above the clouds due to the loss of the artificial horizon. ATC observed the aircraft climbing to a higher altitude and advised the pilot that there was no traffic in the area and that maintaining altitude was not required if it could not be done. The pilot responded that he would attempt to determine which instruments could be relied upon and would try to return to 9,000 feet, noting that the weather was beginning to open up. When asked if he could descend to 7,000 feet and remain above the clouds, the pilot replied that he was almost in the clouds at that time. The aircraft subsequently separated into pieces and descended to the ground.
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