Investigation Summary
Flight 786 was a scheduled domestic service from Douala to Garoua with an intermediate stop in Yaounde. During the taxi phase to runway 12/30, the right-hand engine suffered a catastrophic structural failure. Debris from the seventh-stage compressor disk breached the engine casing and perforated the wing's fuel tanks. The leaking fuel was ignited by sparks generated when the disk fragments struck the ground or by contact with hot engine components. A 12-knot wind blowing from the side of the aircraft fanned the flames, causing the fire to spread rapidly across the right side and rear of the fuselage. Although the cabin crew initiated an evacuation and most passengers escaped, two individuals perished in the flames external to the aircraft after exiting. The airframe was a total loss. Decades later, a Cameroonian court ruled that the accident resulted from negligence by Boeing and Pratt & Whitney regarding safety standards and design, though the technical root cause of the disk failure was not definitively established by aviation investigators at the time.
Final Conclusions
The accident was caused by an uncontained failure of the number two engine's high-pressure compressor disk, which led to a fuel tank puncture and a ground fire. In March 2024, the Wouri High Court in Douala held Boeing and Pratt & Whitney liable for the tragedy, citing breaches in mandatory air safety standards and design negligence.
Video Analysis
No video analysis linked for this case file yet.
Airframe & Maintenance
Systems & Failure Modes
Pratt & Whitney JT8D-15 Engine
The powerplant suffered an uncontained failure of the high-pressure compressor, meaning debris exited the engine casing at high velocity.
Wing Fuel Tank
The structural integrity of the right wing tank was compromised by engine fragments, leading to the fuel leak that fueled the fire.
Interesting Facts
- 01The aircraft was a Boeing 737-200 delivered to Cameroon Airlines in 1977.
- 02The failure involved the seventh-stage disk of the high-pressure compressor.
- 03A total of 114 people survived the accident.
- 04The Wouri High Court ordered Boeing and Pratt & Whitney to pay approximately $254 million in damages in 2024.
- 05The engine involved was a Pratt & Whitney JT8D-15.
- 06The official technical investigation by Cameroonian authorities was never completed.
Safety Actions & Advisories
Legal Liability Ruling
In 2024, a Cameroonian court established liability for the manufacturers regarding adherence to safety standards outlined in the 1944 Chicago Convention and the 1970 U.S. Code of Federal Regulations.
Known Controversies & Unanswered Questions
Incomplete Official Investigation
Reference ↗Former Cameroon Airlines Chief Pilot Jean Louis Angounou stated in 2009 that the exact cause was never officially determined because the investigation was started but never completed by Cameroonian authorities.