Investigation Summary
The aircraft departed Heathrow at 05:54 GMT on a multi-stop cargo route to Tel Aviv, with scheduled stops at Nice, Brindisi, and Athens, carrying two Bristol Proteus engines as freight. Fifteen minutes into the flight, the captain reported engine trouble and requested a diversion to Blackbushe. Although the crew initially maintained 7,000 feet, they began a descent that they could not arrest. The starboard engine was feathered, but the crew later reported difficulty unfeathering it because the feathering motor had burned out. Navigation errors further complicated the emergency; the crew mistakenly headed toward Epsom instead of Blackbushe, an error of approximately 70 degrees. As the aircraft descended through 400 feet, it was actually 20 miles away from its intended diversion point. The inquiry found that the captain had been on duty for 31 hours and 30 minutes, nearly double the legal limit of 16 hours. This exhaustion, combined with an aircraft that was overloaded by approximately 400 kg (882 lbs) and improperly maintained, left the crew unable to manage the asymmetric thrust requirements of single-engine flight.
Final Conclusions
The public inquiry concluded that the probable cause was the pilot's inability to maintain asymmetric control after the aircraft lost height and flying speed. The report placed primary blame on the 'deliberate policy' of Independent Air Travel to prioritize aircraft utilization over safety regulations and maintenance requirements. It noted that the captain was placed under an 'intolerable burden' due to extreme fatigue and that the maintenance performed on the propeller the night before the crash was conducted by unqualified personnel.
Video Analysis
No video analysis linked for this case file yet.
Airframe & Maintenance
Crew Experience
Captain
The inquiry noted the captain was under an 'intolerable burden' due to extreme fatigue.
First Officer
Took over radio communications in the final minutes; qualifications were questioned during the inquiry.
Systems & Failure Modes
Propeller Feathering System
The starboard feathering motor burned out, preventing the crew from restarting the engine after they had initially feathered it.
Asymmetric Control
The pilot was unable to maintain control of the aircraft while flying on a single engine due to a combination of low airspeed, low altitude, and excessive weight.
Interesting Facts
- 01The aircraft was overloaded by 400 kg (882 lbs) at the time of takeoff.
- 02The captain had been on duty for 31 hours and 30 minutes, violating the 16-hour regulatory limit.
- 03Maintenance on the starboard propeller the night before was performed by unqualified staff.
- 04The starboard feathering motor was found to have burned out during the flight.
- 0514-year-old Brian Gibbons received the George Medal for rescuing his nephew from the burning wreckage on the ground.
Safety Actions & Advisories
Regulatory Loophole Closure
The inquiry highlighted a loophole allowing crews to fly during 'rest' hours if no passengers or cargo were carried, which the company had exploited to overwork pilots.
Operator Oversight
Following the accident, Independent Air Travel was removed from the government's list of approved operators and its approval for scheduled services was withdrawn.
Pilot Competency Standards
The inquiry criticized 'perfunctory' check flights that failed to adequately test a pilot's ability to handle asymmetric flight at high weights, leading to calls for more rigorous pilot competency evaluations.
Known Controversies & Unanswered Questions
Failure to Prosecute
Reference ↗A 1961 Parliamentary debate censured the Attorney-General for failing to institute criminal proceedings against Independent Air Travel despite documented evidence of overloading and maintenance violations submitted shortly after the crash.