Impaired pilot performance: drugs or alcohol

Area of Science:

• Aviation Safety
• Toxicology
• Accident Investigation

Background:

• Investigation of a fatal light aircraft accident involving engine failure.
• Pilot was a Boeing 707 captain with two passengers on board.

Observation:

• Pilot and one passenger fatally injured.
• Pilot's liver showed diffuse fatty changes.
• Toxicology revealed high blood alcohol concentration (149 mg/100 ml) and presence of chlordiazepoxide.

Findings:

• Accident cause: stall at low altitude during forced landing attempt.
• Pilot's ability to manage stall was impaired by alcohol intoxication.
• Presence of nitrazepam or chlordiazepoxide also suspected.

Implications:

• Alcohol impairment significantly impacts pilot performance and aviation safety.
• Highlights the critical role of toxicology in accident investigation.
• Underscores the need for strict alcohol policies in aviation.