Accident Summary
On an unspecified date, an airplane departed from Pasco-Tri-Cities Airport. During the initial climb, the aircraft assumed a nose-high attitude with a high angle of attack. It subsequently stalled and crashed near the airport in a large explosion, resulting in the death of both pilots.
Investigation Findings
Official investigators determined the probable cause of the accident to be inadequate preflight preparation by the pilot and improper operation of flight controls by the copilot. The investigation revealed that after takeoff, the airplane pitched up steeply. Examination of the wreckage showed that the pitch trim was set to the full nose-up position, and the pilot-in-command's seat was unlocked and found in the full aft position. These conditions likely contributed to the loss of control, though the source does not explicitly state a causal link.