Bell 206B accident near Vernal, Utah, October 3, 1998
On October 3, 1998 at about 11:30 pm local time, a Bell 206B (helicopter), registered N992SM, was substantially damaged in an accident near Vernal, Utah. It was a personal flight under general aviation rules (Part 91). No one was hurt; 2 people were on board or involved. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
Loss of tail rotor effectiveness. A factor was the quartering tailwind.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- October 3, 1998 · about 11:30 pm local time
- Place
- Vernal, Utah · map
- Type
- Accident
- Injuries
- No one was hurt; 2 people were on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Bell 206B · all 206Bs on the register
- Registration
- N992SM · no longer on the register · serial 4181
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
THIS CASE WAS MODIFIED DECEMBER 20, 2005. The pilot was attempting to land in a strong quartering tailwind because his passenger had become air sick. He said the helicopter 'was practically in a hover [with] full power applied. . .when a gust of wind from behind hit me just as I was turning into the wind using left pedal. The helicopter weather vaned, I reacted with full right pedal and then the gust either stopped or came from a different direction weather vaning us back to the west where I applied full left pedal. I could feel buffeting in the controls similar to turbulence. The right yaw was so rapid that I entered loss of tail rotor effectiveness.' The helicopter collided with terrain while it was still turning and rolled over. According to the passenger, the pilot had attempted landings earlier in the day but had difficulty with the wind. He succeeded in landing after several attempts.
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
Pilot
- Certificate: commercial pilot
- Ratings: instrument: helicopter; rotorcraft: helicopter
- Flight time: 560 hours in all; 62 in this make and model; 85 in the last 90 days; 60 in the last 30 days; 50 as pilot in command
- Medical certificate: Class 2 (valid medical--no waivers/lim.)
- Seat: rgt
The aircraft
- Airframe total time: 55 hours
- Last inspection: 100-hour inspection, September 18, 1998; 1,190 hours since
- Maximum gross weight: 3,200 lb
- Seats: 5
- Landing gear: fixed
- Engine: Allison 250-C20J (turboshaft); 0 hours total
- Operator: Enterprise Aviation, INC.
The flight
- Departed from: SBS Steamboat Sprgs CO at 10:40 pm
- Destination: BTF Salt Lake City UT
- Flight plan: none
- Runway 0
Weather at the time
- Light: daylight
- Wind: from 350° at 10 knots
- Visibility: 10 statute miles
- Sky: broken clouds at 6,000 ft; not recorded
- Temperature: 46°F (8°C), dew point 43°F (6°C)
- Altimeter: 29.00 inHg
- Observation at 11:53 pm from VEL, 35 miles away
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 | |||
| Passengers | 1 |
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.