Grumman G164B accident near Advance, Missouri, April 12, 1986
On April 12, 1986 at about 3:30 pm local time, a Grumman G164B, registered N6609Q, was substantially damaged in an accident near Advance, Missouri. 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
- April 12, 1986 · about 3:30 pm local time
- Place
- Advance, Missouri · map
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Grumman G164B · all G164Bs on the register
- Registration
- N6609Q · registry record · serial 136B
- 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 AIRPLANE WAS BEING OPERATED AS AN AGRICULTURAL AIRCRAFT WHEN THE ENGINE STARTED BACKFIRING AND THEN QUIT. DURING THE FORCED LANDING IN A PLOWED FIELD, THE AIRPLANE FLIPPED FORWARD TO THE INVERTED POSITION. INVESTIGATION REVEALED THE TEETH ON THE LEFT MAGNETO WERE ALL BROKEN OFF. A NEW MAGNETO AND A PROPELLER WERE INSTALLED AND AFTER GROUND RUN, THE ENGINE OPERATED NORMALLY. AFTER REPLACEMENT OF THE RUDDER, THE AIRPLANE WAS FLOWN OUT OF THE FIELD. AFTER REPLACEMENT OF THE ENGINE, THE AIRPLANE WILL BE RETURNED TO SERVICE.
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: airline transport pilot, flight instructor
- Ratings: multi-engine land; single-engine land; instructor: airplane multi-engine; instructor: airplane single-engine; instrument: airplane; rotorcraft: glider
- Flight time: 8,774 hours in all; 180 in the last 90 days; 8,720 as pilot in command
- Medical certificate: Class 1 (valid medical--no waivers/lim.)
- Seat: ctr
The aircraft
- Airframe total time: 3,131 hours
- Last inspection: annual inspection, April 1, 1985
- Maximum gross weight: 6,075 lb
- Seats: 1
- Landing gear: fixed
- Engine: P&W R-1340 (piston); 0 hours total
The flight
- Departed from: Plainton MO at 2:45 pm
- Flight plan: none
- Runway 0
Weather at the time
- Light: daylight
- Visibility: 12 statute miles
- Sky: scat at 10,000 ft
- Temperature: 64°F (18°C), dew point 54°F (12°C)
- Altimeter: 29.00 inHg
- Observation at 2:50 pm from CGI, 16 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 N6609Q 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.