Event Overview
During a landing on a 2,800-foot-long runway, the pilot touched down at his normal point. The terrain beyond the far end of the runway sloped downward. The airplane did not decelerate as expected and continued off the departure end of the runway. After leaving the runway surface, the airplane became airborne again and then settled into trees.
Pilot Statement
The pilot stated that this was his first landing while wearing a headset. He reported that upon touchdown, he had failed to close the throttle completely. Additionally, he noted that he did not hear the engine or other sounds of speed, and he did not adjust to judging speed by sight.
Contributing Factors
According to the pilot, the incomplete throttle closure and his reliance on auditory cues for speed judgment, which were masked by the headset, led to the failure to decelerate normally.