On September 22, 1990, a Beech 95-B55 (registration N9UP) operated by Great American Aviation Inc was involved in an aviation accident near Smithfield, PA. Investigators recorded the probable cause as: THE FAILURE OF BOTH PILOTS TO MAINTAIN AIRCRAFT CONTROL WHILE CONDUCTING TRAINING MANEUVERS AT AN ALTITUDE THAT PRECLUDED A SAFE RECOVERY. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
Witnesses heard pilots discussing training shortly before takeoff. Less than six minutes later, the aircraft was seen diving into the ground. The left engine magneto switch was in the off position. Both engines showed no discrepancies after teardown.
Preflight Discussion and Takeoff
Witnesses reported hearing the pilots discussing the possibility of conducting pilot training prior to departure. The aircraft then took off.
Observed Events Shortly After Departure
Less than 6 minutes after takeoff, the airplane was observed in a dive that continued until ground impact. During this time, the sound of the engine(s) was changing.
Post-Accident Examination
Following the accident, investigators found the left engine magneto switch in the off position. Teardown examinations of both engines were conducted and did not reveal any discrepancies.
Pilot Qualifications
The other pilot (not specified further in the source) held a commercial pilot certificate with airplane single- and multi-engine land ratings, an instrument rating, and a flight instructor certificate with an airplane single-engine rating.