Robinson R66 incident near Bern, Ch, February 7, 2015
On February 7, 2015 at about 1:00 pm local time, a Robinson R66 (helicopter), registered HBZOK, was involved in an incident near Bern. The NTSB record does not give the injuries.
The NTSB's probable cause their words, unchanged
The NTSB has not yet published a probable cause for this incident. Investigations usually take one to two years; this page updates when the final report is released.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- February 7, 2015 · about 1:00 pm local time
- Place
- Bern, Switzerland
- Type
- Incident
- Injuries
- The NTSB record does not give the injuries.
- Weather
- not recorded
- Aircraft
- Robinson R66 · all R66s on the register
- Registration
- HBZOK · no longer on the register · serial 0553
- Damage
- Not recorded
- Flight
- Flight
The NTSB's narrative preliminary · quoted from the NTSB record
This is preliminary information, subject to change, and may contain errors. On February 7, 2015, between 1300-1400 UTC, a Robinson R66 helicopter, HB-ZOK, (s/n 0553) experienced a loss of engine power during recovery from an autorotation on a training flight. The pilot landed the helicopter, restarted the engine and returned to Bern Airport, Bern, Switzerland without further incident. This investigation is under the jurisdiction and control of the Swiss Transportation Safety Board. Under the provisions of Annex 13 of the Convention on International Civil Aviation as a State of Design, the United States has designated an accredited representative to participate in the investigation. Any further information may be obtained from: STSB Aviation Division Aerópôle 1 1530 Payerne Telephone: +41 58 466 33 00 Facsimile: +41 58 466 33 01 E-mail: info-av@sust.admin.ch Investigator-in-Charge Mr. Olivier de Sybourg Telephone: +41 58 466 33 07 E-mail: olivier.desybourg@sust.admin.ch This report is for informational purposes only and contains only information released by, or obtained from, the Swiss Transportation Safety Board.
The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.
The factual record from the NTSB's investigation tables, in plain English
What happened, in order
- Autorotation Loss of engine power (total) defining event
The aircraft
- Landing gear: fixed
Weather at the time
- Temperature: 0°F (-18°C), dew point 0°F (-18°C)
Documents from the investigation the NTSB's docket: the evidence folder behind the report
The docket, the folder of records gathered during an investigation (maintenance records, photographs, witness statements, examinations), has not been read from the NTSB for this case yet; the list appears here once it has. Open the docket at the NTSB.
Everything on this page comes from the NTSB's public records. The narrative, probable cause and findings are the NTSB's own words; the coded tables behind the report are written out in plain English, with pilots' ages, home towns and medical details left out. The documents and photographs are the NTSB's docket, shown as the NTSB released them. This site's own text never names anyone involved. A preliminary report can change; the final report usually follows one to two years later, and the page is refreshed when it does.