On October 10, 2006, a De Havilland DHC-4 Caribou (registration PK-YRO) operated by Trigana Air Service was involved in an aviation accident near Mamit, Indonesia during landing or approach. No fatalities were reported. Investigators recorded the probable cause as: The aircraft veered off the runway due to the slippery conditions of the wet gravel surface. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A); 8 related events involving the same aircraft type or operator are linked below.
An aircraft veered off a wet gravel runway during landing, resulting in the airframe breaking into two pieces, though all occupants escaped without injury.
What happened
During the landing phase on runway 11/29, the aircraft departed the prepared surface of the wet gravel runway. The excursion continued into an adjacent wooded area, where the force of the impact caused the airframe to separate into two distinct sections.
Despite the structural failure of the aircraft, there were no injuries reported among the occupants. All five individuals on board successfully evacuated the wreckage without sustaining any harm.
Findings
The runway surface consisted of wet gravel at the time of the incident.
The primary factor in the loss of directional control was the wet condition of the gravel runway.
Probable cause
The aircraft veered off the runway due to the slippery conditions of the wet gravel surface.