Flight Sequence
A pilot and passenger departed on a night personal flight. Immediately after departure, the passenger asked the pilot if he had turned on the heat. The pilot informed the tower air traffic controller that he needed to return to the airport. The controller cleared the airplane to land and asked if assistance was needed; the pilot replied "negative" and did not declare an emergency. The pilot acknowledged to the passenger that it was hot in the cabin. The cockpit voice recorder (CVR) captured 11 enhanced ground proximity warning system (EGPWS) alerts, including obstacle, terrain, and stall warnings, while the airplane was on the downwind leg. The airplane subsequently impacted trees and terrain and was consumed by postimpact fire.
Postaccident Examination
Examination of the airplane revealed no malfunctions or anomalies that would have precluded normal operation. The passenger was seated in the right front seat, in the immediate vicinity of the flight controls, but no evidence indicated she was operating them during the flight.
Pilot Medical and Toxicology Findings
Although the pilot had a history of coronary artery disease, autopsy found no evidence of a recent cardiac event, and CVR analysis showed he was awake, speaking, and not complaining of chest pain or shortness of breath. It is unlikely that his cardiac condition contributed to the accident. Toxicological testing detected several prescription medications, including one for heart disease, but it is unlikely any resulted in impairment. Testing also revealed prior marijuana use, but insufficient evidence existed to determine impairment at the time. Additionally, methylone (0.34 ug/ml), a stimulant similar to cocaine and Ecstasy, was detected. Methylone can cause acute changes in cognitive performance and impair information processing. Given the level detected, it is likely the pilot was impaired at the time of the accident.
Probable Cause
The National Transportation Safety Board determined the probable cause was the pilot's failure to maintain airplane control while maneuvering in the traffic pattern at night, and contributing to the accident was the pilot's impairment from the use of illicit drugs.