A Dornier Do 28D-2 Skyservant, HK-3982, departed Villavicencio, Colombia at 10:50, bound for Mit£. At 12:22 the airplane departed Mit£ for La Pedrera. En route the flight encountered poor weather. The crew contacted Mit£ to request the weather at La Pedrera, but the controller at Mit£ was unable to obtain the weather information. The crew decided to divert to a jungle airstrip at Taraira. The soft surface runway is 515 metres long. The airfield was not authorized for operation at the time of the accident. When the crew attempted to takeoff from the airstrip, acceleration was not as expected and the takeoff was abandoned. The airplane ran off the airstrip and suffered structural damage. PROBABLE CAUSE: (translated from original Spanish report) Decision by the crew to abort takeoff from an inappropriate field due to the wet conditions and soft surface which produced higher coefficients of friction and a lower acceleration factor that prevented reaching takeoff speed after which the crew determined to discontinue the takeoff without sufficient stopping distance, which led to the accident.