12 fatalities

1956 Mount Koupé Aircraft Accident (F-BGOI)

Mt Koupé, CameroonLanding (descent or approach)

On April 18, 1955, a De Havilland DH.114 Heron (registration F-BGOI) operated by Union Aéromaritime de Transport - UAT was involved in an aviation accident near Mt Koupé, Cameroon during landing or approach. 12 people were killed. Investigators recorded the probable cause as: The accident seems to be the consequence of a controlled flight into terrain. Nevertheless, investigations were unable to determine the exact cause of the accident and the reason why the flight was off course to the north as the aircraft crashed 80 km north… This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A); 7 related events involving the same aircraft type or operator are linked below.

Sourcesthe Bureau of Aircraft Accidents Archives (B3A)Primary reportUpdated 2026-06-12Data APIEditorial standards

A four-engine aircraft on a flight from Yaoundé to Douala struck Mount Koupé under marginal weather conditions. Search efforts failed to locate the wreckage or 12 occupants; walkers discovered the crash site weeks later.

Accident Details

On a flight from Yaoundé to Douala, a four-engine aircraft departed Yaoundé at 1658 local time with an estimated arrival time of 1730 local time. While cruising in marginal weather conditions, the aircraft struck the slope of Mount Koupé, which rises to 2,064 meters. The mountain is located approximately 80 kilometers north of Douala.

Search and Discovery

After the aircraft failed to arrive at Douala, search and rescue operations were initiated. These efforts were eventually suspended several days later when no trace of the aircraft or its 12 occupants was found. On 19 February 1956, walkers discovered the wreckage in a dense, wooded area on Mount Koupé.

Investigation Findings

The official investigation determined that the accident likely resulted from controlled flight into terrain. However, investigators could not ascertain the exact cause of the accident or the reason why the flight deviated off course to the north, as the aircraft crashed 80 kilometers north of Douala while en route from the east.

Probable cause

The accident seems to be the consequence of a controlled flight into terrain. Nevertheless, investigations were unable to determine the exact cause of the accident and the reason why the flight was off course to the north as the aircraft crashed 80 km north of Douala on a flight from the east.