Incident
On February 7, 2015, between 1300 and 1400 UTC, a Robinson R66 helicopter, registration HB-ZOK and serial number 0553, experienced a loss of engine power during the recovery phase of an autorotation conducted as part of a training flight. The pilot executed a landing following the power loss, subsequently restarted the engine, and returned to Bern Airport in Bern, Switzerland without any further incident.
Aircraft
The helicopter involved was a Robinson R66, a light single-engine rotorcraft. The specific registration HB-ZOK and serial number 0553 were noted in the preliminary report. The aircraft was being operated on a training flight at the time of the event.
Investigation
The Swiss Transportation Safety Board (STSB) is conducting the investigation under its jurisdiction and control. In accordance with Annex 13 of the Convention on International Civil Aviation, as the state of design, the United States has designated an accredited representative to participate in the investigation. The STSB has released preliminary information, subject to change, and has not yet determined a probable cause. Further details may be obtained from the STSB Aviation Division.
Response
The pilot’s actions resulted in a safe landing, engine restart, and return to base without injury or damage reported. The investigation remains ongoing as authorities gather and analyze additional data.