Introduction
A helicopter pilot reported that after takeoff, while climbing through approximately 300 feet, the engine experienced a loss of power. The pilot maneuvered the helicopter toward the beach and landed about 20 yards offshore.
Investigation Findings
Examination of the fuel system revealed no fuel contamination in the fuel tanks, which contained sufficient fuel. A slight amount of sand or silt was found in the fuel strainer, and the carburetor bowl contained about a pint of water mixed with sand or silt. The left fuel tank vent line and vent line 'B' nut were damaged.
Engine examination showed valve train continuity on all cylinders. During an attempt to start the engine, the magnetos would not produce a spark. The carburetor exhibited internal corrosion, but no preimpact failure or malfunction was noted.
Both magnetos showed internal corrosion. The points of both magnetos were lightly dressed and high tension tested; after that, both magnetos produced spark. One ignition lead on the left magneto was not firing due to corrosion on an electrode; after cleaning, the magneto fired all ignition leads. Additionally, the condenser of the right magneto tested bad.
Conclusion
The investigation documented several issues, including water and sand/silt contamination in the fuel system, corrosion in the carburetor and magnetos, and a faulty condenser. The pilot's timely actions resulted in a successful offshore landing.