Amateur-built 150 accident near Osceola, Wisconsin, August 9, 2021
On August 9, 2021 at about 11:00 pm local time, a 2014 amateur-built 150, registered N997EM, was substantially damaged in an accident near Osceola, Wisconsin (L O Simenstad Municipal airport). It was a personal flight under general aviation rules (Part 91). 1 person had minor injuries. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
The total loss of engine power for undermined reasons based on available information
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- August 9, 2021 · about 11:00 pm local time
- Place
- Osceola, Wisconsin · L O Simenstad Municipal · map
- Type
- Accident
- Injuries
- 1 person had minor injuries.
- Weather
- visual conditions (good weather)
- Aircraft
- Amateur-built 150, built 2014
- Registration
- N997EM · no longer on the register · serial 603
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
The pilot completed one touch and go landing. During the climb the airplane’s engine lost total power. The pilot selected a field for a forced landing. During the forced landing the airplane impacted terrain and came to rest upright. The airplane sustained substantial damage when both wings separated from the fuselage during the forced landing. The airplane was recovered, and the engine was examined. Impact damage to the carburetor prevented an engine test run. A visual inspection of the engine noted that a wire separated from the left magneto; however, it could not be determined if this was a result of the forced landing or if it had separated before the landing. The magneto was removed and tested by rotating the magneto with a drill; spark was observed on each terminal. The engine and fuel system examination did not reveal a reason for the loss of engine power.
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
What happened, in order
- Unknown or undetermined during unknown defining event
- Loss of engine power (total) during initial climb
- Off-field or emergency landing during landing (flare/touchdown)
The NTSB's findings
- Aircraft › Aircraft power plant › Engine (reciprocating) › (general) › Unknown/Not determined
Pilot
- Certificate: private
- Ratings: single-engine land
- Flight time: 470.3 hours in all; 157 in this make and model; 16.4 in the last 90 days; 11.3 in the last 30 days; 398.4 as pilot in command
- Last flight review: November 5, 2019
- Medical certificate: Unknown
- Seat: left
- Injury: minor injuries
The aircraft
- Airframe total time: 238.2 hours
- Last inspection: condition inspection, October 22, 2020
- Seats: 2
- Landing gear: fixed
- Engine: Continental O-200A (piston); 0 hours total
The flight
- Flight plan: none
- Runway 10, 5,006 ft by 75 ft
Weather at the time
- Light: daylight
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 84°F (29°C), dew point 68°F (20°C)
- Altimeter: 29.84 inHg
- Observation at 10:55 pm
Weather report (METAR): KOEO 092255Z AUTO 00000KT 10SM CLR 29/20 A2984 RMK AO2 T02900196
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Flight crew | 1 |
Documents from the investigation the NTSB's docket: the evidence folder behind the report
5 documents, released by the NTSB on January 13, 2022. View them here, or download them; the NTSB redacts some personal details before release, and this site shows the NTSB's own titles rather than its file names.
| # | Document | What it is | |
|---|---|---|---|
| 1 | Pilot/operator Aircraft Accident Report, NTSB Form 6120.1 | PDF, 7 pages | View Download |
| 2 | Examination | PDF, 2 pages | View Download |
| 3 | FAA Interview | PDF, 2 pages | View Download |
| 4 | Release of Aircraft Wreckage, NTSB Form 6120.15 | PDF, 1 page | View Download |
| 5 | Photos | PDF, 4 pages | View Download |
The same docket at the NTSB · documents without a copy here are fetched from the NTSB when you open them.
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.