Bell 505 accident near Petersgrat Mountain, Outside the U.S., April 10, 2025
On April 10, 2025 at about 8:25 am local time, a Bell 505 (helicopter), registered HBZWF, was destroyed in an accident during landing near Petersgrat Mountain, Outside the U.S. (Petersgrat Mountain Landing Si airport). It was flown under rules the NTSB did not record. 2 people were seriously injured; 1 other was unhurt.
The NTSB's probable cause their words, unchanged
The NTSB has not yet published a probable cause for this accident. Investigations usually take one to two years; this page updates when the final report is released.
Source: NTSB aviation accident database, copy made October 12, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- April 10, 2025 · about 8:25 am local time · cases in 2025
- Place
- Petersgrat Mountain, Switzerland · Petersgrat Mountain Landing Si · cases near this airport · map
- Type
- Accident
- Injuries
- 2 people were seriously injured; 1 other was unhurt.
- Weather
- not recorded
- Aircraft
- Bell 505 · all 505s on the register
- Registration
- HBZWF · registered outside the United States · serial 65299
- Damage
- Destroyed
- Flight
- Flight · rules the NTSB did not record
The factual record from the NTSB's investigation tables, in plain English
What happened, in order
- Roll over during landing defining event
The aircraft
- Landing gear: fixed
The flight
- Departed from: LSZB Bern OF
- Destination: LSVP Petersgrat Mountain Landing Site OF
Weather at the time
- Temperature: 0°F (-18°C), dew point 0°F (-18°C)
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Flight crew | 1 | 1 | ||
| Passengers | 1 |
Documents from the investigation the NTSB's docket: the evidence folder behind the report
The NTSB has not released the docket for this case yet. The docket, the folder of records gathered during an investigation (maintenance records, photographs, witness statements, examinations), is usually released when the investigation is nearly complete, and the list here is refreshed when it appears. Check at the NTSB.
Connections how this case links to the rest of the register
- Accidents and incidents in Outside the U.S. 1,208 since 1982 · 1,191 in the last ten years
- Outside the U.S. 0 aircraft registered
The whole map of how records connect · these connections as data: /graph/accident/ENG25WA033.json.
The bigger picture in Aviation Analytics: accidents over time since 1982, by model, by phase of flight and conditions, by place and on the map.
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 does not name anyone involved, its policy at this time. A preliminary report can change; the final report usually follows one to two years later, and the page is refreshed when it does.