Grumman G-164A accident near Two Buttes, Colorado, July 24, 2002
On July 24, 2002 at about 1:45 pm local time, a Grumman G-164A, registered N5416, was substantially damaged in an accident near Two Buttes, Colorado (Doyle'S Airfield). It was an aerial application (crop spraying) flight under agricultural flying rules (Part 137). No one was hurt; 1 person was on board or involved. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
the failure of the right main landing wheel master brake cylinder and the subsequent inadvertent ground loop during the landing roll by the pilot.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- July 24, 2002 · about 1:45 pm local time
- Place
- Two Buttes, Colorado · Doyle'S Airfield · map
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Grumman G-164A · all G-164As on the register
- Registration
- N5416 · registry record · serial 1030
- Damage
- Substantial damage
- Flight
- Aerial application (crop spraying) flight · agricultural flying rules (Part 137)
The NTSB's narrative final · quoted from the NTSB record
The pilot said that he was landing with a load of herbicide. During the landing roll, the airplane started to veer to the left. The pilot said he applied right rudder and right brake, but the airplane did not respond. The airplane ground looped to the left, and the right main landing gear separated from the airplane. He said all four wings appeared wrinkled, but the lower right wing was bent up. Postaccident investigation of the right brake revealed that its master brake cylinder had failed.
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: single-engine land
- Flight time: 1,700 hours in all; 300 in this make and model; 140 in the last 90 days; 40 in the last 30 days; 1,600 as pilot in command
- Last flight review: July 15, 2002
- Medical certificate: Class 2 (valid medical--no waivers/lim.)
- Seat: ctr
- Injury: no injuries
The aircraft
- Airframe total time: 8,152 hours
- Last inspection: annual inspection, July 15, 2002; 5 hours since
- Maximum gross weight: 2,500 lb
- Seats: 1
- Landing gear: fixed
- Engine: Pratt & Whitney R1340 (piston); 0 hours total
The flight
- Departed from: NONE Two Buttes CO at 1:15 pm
- Flight plan: none
- Runway 180, 2,640 ft by 60 ft
Weather at the time
- Light: daylight
- Wind: from 190° at 10 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 75°F (24°C), dew point 57°F (14°C)
- Altimeter: 30.20 inHg
- Observation at 1:56 pm from SPD, 11 miles away
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 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.
Other NTSB records under N5416 the same tail number, which may have belonged to a different aircraft at the time
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.