# NTSB CEN27LA009: Simpson Arthur Monnett Sonerai Iilt, N473AS, Sextonville, WI, October 12, 2026

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Class 3 · Limited · Investigation open
- Date: October 12, 2026, 15:13 local (20:13 UTC)
- Place: Sextonville, WI
- Location: 43.2795° N, 90.2924° W: Placed by OpenAirDocs: center of Sextonville, WI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=43.2795&lon=-90.2924&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Defining event: [Maneuvering: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341)
- Highest injury: Serious injuries
- Injuries: 1 serious
- Status: Investigation ongoing
- Investigation class: Class 3
- NTSB office: Central Region
- NTSB case key (mKey): 203988
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN27LA009
- Latest NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/203988/pdf
- Page: https://openairdocs.org/ntsb/CEN27LA009

## Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event best describes what happened.

- [Maneuvering: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341) (defining event); cases with it: [Simpson Arthur MONNETT SONERAI IILT, 1 case](https://openairdocs.org/ntsb-events/341/sequence.md?model=05642CJ), [All aircraft, 3,820 cases](https://openairdocs.org/ntsb-events/341/sequence.md)

## Aircraft

- Registration: [N473AS](https://openairdocs.org/aircraft/N473AS), registered now, S/N 080706-0831, built 2025 (OpenAirDocs)
- Reported make and model: SIMPSON ARTHUR MONNETT SONERAI IILT
- Registry model: [Simpson Arthur MONNETT SONERAI IILT](https://openairdocs.org/model/simpson-arthur-monnett-sonerai-iilt) (registry code 05642CJ) (OpenAirDocs)
- Registry engine: [Revmaster 2100D](https://openairdocs.org/engine/revmaster-2100d) (registry code 52552, reciprocating) (OpenAirDocs)
- Flight: Flight test, Part 91

## Weather

- Wind: 200° at 10 knots
- Lowest ceiling: none
- Observed at: 7 nm away

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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