# NTSB CEN15WA142: Robinson R66, Bern, Switzerland, February 7, 2015

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Foreign investigation
- Date: February 7, 2015, 13:00 local (13:00 UTC)
- Place: Bern, Switzerland
- Phase of flight: [Emergency descent](https://openairdocs.org/ntsb-phases/600) (OpenAirDocs' grouping)
- Defining event: [Autorotation: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341)
- Highest injury: No injuries
- Status: Led by another country's authority
- NTSB office: Central Region
- Lead agency: Other
- NTSB case key (mKey): 90718
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN15WA142
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/90718/pdf
- Page: https://openairdocs.org/ntsb/CEN15WA142

## Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event best describes what happened.

- [Autorotation: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341) (defining event); cases with it: [All aircraft, 3,820 cases](https://openairdocs.org/ntsb-events/341/sequence.md)

## Factual narrative

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.

## Aircraft

- Registration: HB-ZOK (not matched to a registry record)
- Reported make and model: ROBINSON R66
- Category: Helicopter
- Serial number: 0553
- Damage: No damage

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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