NTSB Identification: ERA10LA216
14 CFR Part 91: General Aviation
Accident occurred Wednesday, April 07, 2010 in Middleboro, MA
Probable Cause Approval Date: 01/07/2011
Aircraft: SMITH RICHARD D JR REVOLUTION MINI 500, registration: N118NR
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

During a 50-minute flight the helicopter pilot observed the engine coolant temperature and the exhaust gas temperature increase. The pilot attempted a precautionary landing to a field; however, as he was adding power to cushion the landing, the engine lost power due to overheating. The helicopter then landed hard and rolled over. Postflight examination of the helicopter revealed that a coolant hose was disconnected and corrosion was noted on the radiator fins, indicating that leakage had occurred over a period of time. No coolant or coolant residue was found during the engine examination.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

A loss of engine coolant, which resulted in a loss of engine power during the pilot’s attempt to cushion a precautionary landing. Contributing to the accident was a disconnected engine coolant hose and the pilot's inadequate preflight inspection.

Full narrative available

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