NTSB Identification: ERA13LA152
14 CFR Part 91: General Aviation
Accident occurred Saturday, March 02, 2013 in Ciales, PR
Probable Cause Approval Date: 08/07/2013
Aircraft: ROBINSON HELICOPTER COMPANY R44 II, registration: N834RC
Injuries: 1 Minor.

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

According to the pilot, the helicopter was in cruise flight about 700 feet above ground level when he perceived a loss of rotor rpm and entered autorotation. During the descent, the helicopter turned 180 degrees, struck power lines, and collided with terrain. A postcrash fire consumed a significant portion of the helicopter. A detailed examination of the remaining portions of the helicopter, its engine, and associated components revealed no preimpact mechanical malfunctions or failures that would have precluded normal operation.

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

A loss of main rotor rpm for reasons that could not be determined because an examination of the helicopter’s engine and associated components did not reveal any mechanical malfunctions or failures that would have precluded normal operation.

Full narrative available

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