# N21WW: 2025 Carson Stilson STOL CH 750SD

- Status: Valid registration
- Airframe: [Carson Stilson STOL CH 750SD](https://openairdocs.org/model/carson-stilson-stol-ch-750sd) (registry code 056421S, 3 seats)
- Engine: [Lycoming YIO-390EXP289](https://openairdocs.org/engine/lycoming-yio-390exp289) (registry code 42431)
- Serial number: 75-11712
- Year built: 2025
- Type: Fixed wing single engine
- Engine type: 4 cycle
- Kit: Zenith Aircraft Co STOL CH 750 SD
- Airworthiness: Experimental, amateur built
- Airworthiness date: July 2, 2025
- Certificate issued: May 20, 2025
- Expires: May 31, 2032
- Mode S code: A1B932
- Registered owner: [Stilson Carson](https://openairdocs.org/faa-owner/STILSON%20CARSON)
- Location: [Saint George, UT](https://openairdocs.org/faa-place/UT/Saint%20George)
- Owner type: Individual
- Owner's area on the map: 37.0461° N, 113.5573° W: Placed by OpenAirDocs at the center of ZIP code 84790, within about 4 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=21WW
- Page: https://openairdocs.org/aircraft/N21WW

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 (Carson Stilson STOL CH 750SD)

None in force.

### Matched by engine (Lycoming YIO-390EXP289)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N21WW.

## FAA accident and incident reports

None matched to N21WW.

## 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 N21WW

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N21WW before.

- [Cancelled 2017-09-15](https://openairdocs.org/deregistered/N21WW-2017-09-15): Piper PA-23-250, S/N 27-7554066, built 1975. Owner: [Air America Inc](https://openairdocs.org/faa-owner/AIR%20AMERICA%20INC), [Carolina, PR](https://openairdocs.org/faa-place/PR/Carolina)

## Related

- Other Carson Stilson STOL CH 750SD aircraft: https://openairdocs.org/model/carson-stilson-stol-ch-750sd/aircraft.md
- The Lycoming YIO-390EXP289 engine: https://openairdocs.org/engine/lycoming-yio-390exp289.md

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.