Grumman-Schweizer G-164B accident near Donnelly, Minnesota, July 7, 1997
On July 7, 1997 at about 1:00 am local time, a Grumman-Schweizer G-164B, registered N6633K, was substantially damaged in an accident near Donnelly, Minnesota. 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
undetermined event resulting in the broken connecting rod and cylinder.
Source: NTSB aviation accident database, copy made October 4, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- July 7, 1997 · about 1:00 am local time
- Place
- Donnelly, Minnesota · map
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Grumman-Schweizer G-164B
- Registration
- N6633K · no longer on the register · serial 400B
- 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 in a turn to line up on the field he was about to spray when the 'number 9 cylinder blew.' The pilot turned towards a road which he intended to use for landing the airplane on. On approaching the road he 'noticed a person on the road.' The pilot abandoned the attempt to land on that road and began to maneuver for a landing on a perpendicularly intersecting road. As he was maneuvering, the 'engine failed completely.' The pilot put the airplane down in the field. During the landing roll, one main landing gear leg broke. The airplane nosed over coming to rest inverted in the field. Examination of the airplane revealed a large amount of oil covering the airplane's exterior. Examination of the airplane's engine revealed the number nine cylinder broken into three pieces. The number nine cylinder connecting rod was also broken. No other anomalies were found with the airplane.
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; instrument: airplane
- Flight time: 2,500 hours in all; 1,500 in this make and model; 200 in the last 90 days; 100 in the last 30 days; 2,500 as pilot in command
- Medical certificate: Class 2 (valid medical--w/ waivers/lim.)
- Seat: ctr
The aircraft
- Last inspection: annual inspection
- Maximum gross weight: 6,075 lb
- Seats: 1
- Landing gear: fixed
- Engine: P&W R-1340 (piston); 0 hours total
The flight
- Departed from: MOX Morris MN
- Flight plan: none
- Runway 0
Weather at the time
- Light: daylight
- Wind: from 360° at 3 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 63°F (17°C), dew point 48°F (9°C)
- Altimeter: 30.00 inHg
- Observation at 11:55 am from MOX, 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 N6633K 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 documents and photographs are the NTSB's docket, the folder of records gathered during the investigation, shown as the NTSB released them (the NTSB redacts some personal details first) and listed under the NTSB's own titles. This site's own text 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 CHI97LA204.