Grumman-Schweizer G-164A accident near Cokeville, Wyoming, June 14, 2006
On June 14, 2006 at about 4:30 pm local time, a Grumman-Schweizer G-164A, registered N9709, was substantially damaged in an accident near Cokeville, Wyoming (Cokeville Municipal Airport). It was an aerial application (crop spraying) flight under agricultural flying rules (Part 137). 1 person had minor injuries. The weather was visual conditions (good weather).
Preview. This page is not yet listed for search engines.
The NTSB's probable cause their words, unchanged
the pilot's failure to maintain directional control resulting in a ground loop. Contributing factors included the high winds and crosswind.
Source: NTSB aviation accident database, copy made October 4, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- June 14, 2006 · about 4:30 pm local time
- Place
- Cokeville, Wyoming · Cokeville Municipal Airport · map
- Type
- Accident
- Injuries
- 1 person had minor injuries.
- Weather
- visual conditions (good weather)
- Aircraft
- Grumman-Schweizer G-164A
- Registration
- N9709 · registry record · serial 1233
- Damage
- Substantial damage
- Flight
- Aerial application (crop spraying) flight · agricultural flying rules (Part 137)
The NTSB's narrative final · quoted from the NTSB record
According to the pilot, he was returning to the airport due to an approaching thunderstorm. During the landing roll the airplane encountered a gust of wind and ground looped. Both wings separated, the propeller was bent, and the horizontal stabilizer was crushed and wrinkled. The pilot reported no anomalies with the airframe or airplane systems. The routine aviation weather report reported, winds, 230 degrees at 25 knots, gusting 31 knots. The pilot estimated the gust of wind at 40 knots.
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: multi-engine land; single-engine land; instrument: airplane
- Flight time: 10,913 hours in all; 250 in this make and model; 200 in the last 90 days; 50 in the last 30 days; 10,713 as pilot in command
- Last flight review: May 1, 2006
- Medical certificate: Class 2 (without waivers/limitations)
- Seat: frt
- Injury: minor injuries
The aircraft
- Airframe total time: 5,910 hours
- Last inspection: annual inspection, May 1, 2006
- Seats: 1
- Landing gear: fixed
- Engine: Honeywell TPE 331-2-201 (piston); 0 hours total
The flight
- Departed from: U06 Cokeville WY at 4:00 pm
- Destination: U06 Cokeville WY
- Flight plan: none
- Runway 33, 3,400 ft by 60 ft
Weather at the time
- Light: daylight
- Wind: from 230° at 25 knots, gusting 31
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 61°F (16°C), dew point 32°F (0°C)
- Altimeter: 30.01 inHg
- Observation at 4:53 pm from EVW, 45 miles away
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 |
Other NTSB records under N9709 the same tail number, which may have belonged to a different aircraft at the time
About this page
Everything above comes from the NTSB's public accident database: the narrative, probable cause and findings are the NTSB's own words, and the coded tables behind its report (pilot, aircraft, flight, weather, injuries, sequence of events) are written out in plain English. Pilots' ages, home towns and medical details are left out on purpose. The docket at the NTSB holds the report as a PDF and the investigation's photographs and documents. This site never names pilots, passengers or anyone else involved. A preliminary report describes what is known soon after the event and can change; the final report, with the probable cause, usually follows one to two years later and this page is refreshed when it does. Case number DEN06CA088.