Amateur-built PIETENPOL accident near Mt. Vernon, Ohio, May 31, 1986
On May 31, 1986 at about 10:00 pm local time, a amateur-built PIETENPOL, registered N899MG, was substantially damaged in an accident near Mt. Vernon, Ohio. It was a personal flight under general aviation rules (Part 91). 1 person was seriously injured. 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
- May 31, 1986 · about 10:00 pm local time
- Place
- Mt. Vernon, Ohio · map
- Type
- Accident
- Injuries
- 1 person was seriously injured.
- Weather
- visual conditions (good weather)
- Aircraft
- Amateur-built PIETENPOL
- Registration
- N899MG · no longer on the register · serial 1
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
THE ACFT STALLED AND ENTERED A SPIN TO GROUND IMPACT DURING THE INITIAL TAKEOFF CLIMB. THE PLT REPORTED THAT DURING THE TAKEOFF AND CLIMB THE AIRSPEED INDICATOR DID NOT EXCEED 40 MPH. HE ALSO STATED THE ACFT DID NOT APPEAR TO BE TRAVELING VERY FAST. HE THEN INITIATED A RUDDER TURN BACK TOWARD THE ARPT. AFTER THE TURN THE ACFT ENTERED THE STALL. POST ACCIDENT INSPECTION DISCLOSED THE TWO FRONT EXHAUST STACKS AND SPARK PLUGS WERE COVERED WITH BLACK SOOT. THE #3 CYLINDERSPARK PLUG AND PLUG GASKET WERE ALSO SOOT COVERED. THE PLT REPORTED BLACK SMOKE WAS EMITTED FROM THE EXHAUST STACKS DURING HIGH SPEED TAXI RUNS JUST PRIOR TO THIS TAKEOFF. THE PITOT SYSTEM WAS NOT BLOCKED AND THE PITOT TUBE EXTENDED 1 1/2 TO 2 INCHES FROM THE CENTER OF THE WING LEADING EDGE RADIUS.
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: private
- Ratings: single-engine land
- Flight time: 122 hours in all; 1 in this make and model; 88 as pilot in command
- Medical certificate: Class 3 (valid medical--no waivers/lim.)
- Seat: rear
The aircraft
- Last inspection: inspection type not recorded
- Maximum gross weight: 1,089 lb
- Seats: 2
- Landing gear: fixed
- Engine: Ford MODEL A (piston); 0 hours total
The flight
- Departed from: 6G4 Mount Vernon OH at 10:00 pm
- Flight plan: none
- Runway 0
Weather at the time
- Light: daylight
- Wind: from 310° at 4 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 84°F (29°C), dew point 0°F (-18°C)
- Altimeter: 29.00 inHg
- Observation at 9:50 pm from CMH, 32 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.
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.