# N25SX: 2022 Brown David W SONEX B

- Status: Valid registration
- Airframe: [Brown David W SONEX B](https://openairdocs.org/model/brown-david-w-sonex-b) (registry code 05640AP, 2 seats)
- Engine: [Ulpower 350I](https://openairdocs.org/engine/ulpower-350i) (registry code 62001)
- Serial number: 016
- Year built: 2022
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Kit: Sonex Aircraft LLC SONEX B
- Airworthiness: Experimental, amateur built
- Airworthiness date: April 25, 2022
- Certificate issued: May 19, 2021
- Expires: May 31, 2028
- Mode S code: A256CB
- Registered owner: [Brown David W](https://openairdocs.org/faa-owner/BROWN%20DAVID%20W)
- Location: [Ozark, AR](https://openairdocs.org/faa-place/AR/Ozark)
- Owner type: Individual
- Owner's area on the map: 35.5628° N, 93.8072° W: Placed by OpenAirDocs at the center of ZIP code 72949, within about 10 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=25SX
- Page: https://openairdocs.org/aircraft/N25SX

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 (Brown David W SONEX B)

None in force.

### Matched by engine (Ulpower 350I)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N25SX.

## FAA accident and incident reports

None matched to N25SX.

## Reports on N25SX not matched to an aircraft (1)

They name N25SX, but no registry record covers the date, the aircraft registered then was built later, or the report describes another aircraft.

- [Incident 19961013038779I](https://openairdocs.org/incident/19961013038779I), Oct 13, 1996: Amtr GLASAIRIII (N25SX), Tucson, AZ, Minor damage. Narrative: pilot called for taxi and was cleared to "taxi runway 29R via alpha and use intersection alpha 13". As pilot was attempting to enter taxiway alpha…

## 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.

## Earlier aircraft with N25SX

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N25SX before.

- [Cancelled 2015-05-14](https://openairdocs.org/deregistered/N25SX-2015-05-14): Robertson T E/Heisdorffer R SH-IIS, S/N 2072, built 1995. Exported to Russia. Owner: [Jettview Corp](https://openairdocs.org/faa-owner/JETTVIEW%20CORP), [Brightwood, OR](https://openairdocs.org/faa-place/OR/Brightwood)

## Related

- Other Brown David W SONEX B aircraft: https://openairdocs.org/model/brown-david-w-sonex-b/aircraft.md
- The Ulpower 350I engine: https://openairdocs.org/engine/ulpower-350i.md

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