Grumman 164B accident near Twin Falls, Idaho, June 22, 1985
On June 22, 1985 at about 1:30 am local time, a Grumman 164B, registered N6762K, was substantially damaged in an accident near Twin Falls, Idaho (Twin Falls airport). 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 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 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- June 22, 1985 · about 1:30 am local time
- Place
- Twin Falls, Idaho · Twin Falls · map
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Grumman 164B
- Registration
- N6762K · no longer on the register · serial 456B
- Damage
- Substantial damage
- Flight
- Aerial application (crop spraying) flight · agricultural flying rules (Part 137)
The NTSB's narrative final · quoted from the NTSB record
A PARTIAL LOSS OF POWER OCCURRED DURING AERIAL APPLICATION DUE TO A CRACK AROUND ONE OF THE CYLINDERS. WHILE THE PLT WAS ATTEMPTING TO DUMP CHEMICALS, THE ACFT SETTLED ONTO THE GROUND TEARING OFF THE RT MAIN GEAR. THE PLT THEN FLEW ON TO TWIN FALLS TO LAND. THE ACFT FLIPPED INVERTED DURING THE LANDING.
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; single-engine sea; instructor: airplane single-engine
- Flight time: 11,850 hours in all; 4,000 in this make and model; 170 in the last 90 days; 11,850 as pilot in command
- Medical certificate: Class 2 (valid medical--w/ waivers/lim.)
- Seat: ctr
The aircraft
- Last inspection: 100-hour inspection, May 13, 1985; 96 hours since
- Maximum gross weight: 4,500 lb
- Seats: 1
- Landing gear: fixed
- Engine: P&W R-1340-AN1 (piston); 0 hours total
The flight
- Departed from: TWF Twin Falls ID
- Flight plan: none
- Runway 12, 3,207 ft by 100 ft
Weather at the time
- Light: daylight
- Visibility: 50 statute miles
- Sky: clear
- Temperature: 70°F (21°C), dew point 28°F (-2°C)
- Observation at 7:30 pm from 1
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.
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.