# N861SX: 2011 Larson William E SONEX

- Status: Valid registration
- Airframe: [Larson William E SONEX](https://openairdocs.org/model/larson-william-e-sonex) (registry code 05630XI, 2 seats)
- Engine: [Aerovee 2180](https://openairdocs.org/engine/aerovee-2180) (registry code 01400)
- Serial number: 0861
- Year built: 2011
- Type: Fixed wing single engine
- Engine type: 4 cycle
- Kit: Sonex Aircraft LLC SONEX
- Airworthiness: Experimental, amateur built
- Airworthiness date: October 15, 2011
- Certificate issued: May 13, 2011
- Expires: May 31, 2027
- Mode S code: ABD434
- Registered owner: [Larson William E](https://openairdocs.org/faa-owner/LARSON%20WILLIAM%20E)
- Location: [Dunlap, IL](https://openairdocs.org/faa-place/IL/Dunlap)
- Owner type: Individual
- Owner's area on the map: 40.8478° N, 89.6705° W: Placed by OpenAirDocs at the center of ZIP code 61525, within about 3 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=861SX
- Page: https://openairdocs.org/aircraft/N861SX

From the FAA registry file of October 24, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination.

## ADs that may apply (OpenAirDocs): 0 in force

### Matched by airframe (Larson William E SONEX)

None in force.

### Matched by engine (Aerovee 2180)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N861SX.

## FAA accident and incident reports (1)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Incident 20120626011139I](https://openairdocs.org/incident/20120626011139I), Jun 26, 2012: Larson William E SONEX (N861SX), Dunlap, IL, Minor damage. The aircraft was in cruise flight when the engine lost power and the oil pressure jumped up and down erratically. The pilot initiated a turn, and half-way thru…

## Service difficulty reports

None filed for this aircraft. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

## STCs that may be installed (OpenAirDocs)

None matched to this aircraft's models.

## Related

- Other Larson William E SONEX aircraft: https://openairdocs.org/model/larson-william-e-sonex/aircraft.md
- The Aerovee 2180 engine: https://openairdocs.org/engine/aerovee-2180.md

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