NTSB Identification: WPR11LA469
14 CFR Part 91: General Aviation
Accident occurred Tuesday, September 27, 2011 in Ahwahnee, CA
Probable Cause Approval Date: 06/28/2012
Aircraft: BELL 47D1, registration: N9158R
Injuries: 1 Serious,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.

The pilot and mechanic were on a local area flight to warm the oil before changing the oil lines. As they returned, the pilot slowed the helicopter and initiated a gradual descent to the landing site. The main rotor rpm decreased. As they continued the descent, the clearance from the trees surrounding the landing area was minimal. The pilot attempted to avoid the trees as he tried to regain main rotor rpm. The helicopter impacted a tree and descended nose down into the terrain. According to the mechanic and pilot, they encountered no mechanical anomalies during the flight.

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

The pilot’s failure to maintain adequate main rotor rpm during the landing approach, which resulted in a loss of control.

Full narrative available

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