# N21TS: Stirling Fred KITFOX

- Status: Valid registration
- Airframe: [Stirling Fred KITFOX](https://openairdocs.org/model/stirling-fred-kitfox) (registry code 05612XH, 2 seats)
- Engine: [Bombardier ROTAX (ALL)](https://openairdocs.org/engine/bombardier-rotax-all) (registry code 09050)
- Serial number: 178
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Experimental, amateur built
- Airworthiness date: July 22, 1988
- Certificate issued: July 9, 2020
- Expires: July 31, 2027
- Mode S code: A1B8E3
- Registered owner: [Stubblefield Matthew K](https://openairdocs.org/faa-owner/STUBBLEFIELD%20MATTHEW%20K)
- Location: [West Yellowstone, MT](https://openairdocs.org/faa-place/MT/West%20Yellowstone)
- Owner type: Individual
- Owner's area on the map: 44.7999° N, 111.1904° W: Placed by OpenAirDocs at the center of ZIP code 59758, within about 11 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=21TS
- Page: https://openairdocs.org/aircraft/N21TS

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 (Stirling Fred KITFOX)

None in force.

### Matched by engine (Bombardier ROTAX (ALL))

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N21TS.

## FAA accident and incident reports

None matched to N21TS.

## 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 Stirling Fred KITFOX aircraft: https://openairdocs.org/model/stirling-fred-kitfox/aircraft.md
- The Bombardier ROTAX (ALL) engine: https://openairdocs.org/engine/bombardier-rotax-all.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.