Accident Summary
The pilot reported that engine rpm began decreasing during the takeoff climb, approximately 200 to 300 feet above ground level, while the helicopter was over a grove of trees. To clear the trees, the pilot extended the autorotative glide, which resulted in a further decrease of main rotor rpm. The helicopter subsequently landed hard, with about 20 to 30 miles per hour of forward velocity, and rolled over.
Postcrash Examination
A Federal Aviation Administration (FAA) inspector conducted a postcrash examination and found no evidence of mechanical malfunction. However, fluid in the airframe fuel filter and mechanical fuel pump screen contained approximately 90 percent water. Additionally, about 30 percent of the fluid in the Ceco fuel system screen was water. The FAA inspector also noted that the fuel cap was loose in the opening and did not appear to seal properly. The shaft seal on the cap was worn, and the cap locking mechanism was not adjusted properly. When the fuel cap was removed, the bottom of the fuel filler opening was deformed from fuel nozzles being inserted.
Fuel System Findings
The pilot reported washing the helicopter the night before the accident. During the preflight inspection, he drained fuel from the airframe fuel filter and fuel sump and stated that he did not observe any water or contaminants.