# N111SF: 2021 Williams John J WILLIAMS CX4

- Status: Valid registration
- Airframe: [Williams John J WILLIAMS CX4](https://openairdocs.org/model/williams-john-j-williams-cx4) (registry code 05639UV, 1 seats)
- Engine: [Revmaster 2100D](https://openairdocs.org/engine/revmaster-2100d) (registry code 52552)
- Serial number: 146-X
- Year built: 2021
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Experimental, amateur built
- Airworthiness date: November 15, 2021
- Certificate issued: December 7, 2020
- Expires: December 31, 2027
- Mode S code: A03180
- Registered owner: [Williams John J](https://openairdocs.org/faa-owner/WILLIAMS%20JOHN%20J)
- Location: [Tuttle, OK](https://openairdocs.org/faa-place/OK/Tuttle)
- Owner type: Individual
- Owner's area on the map: 35.2688° N, 97.7988° W: Placed by OpenAirDocs at the center of ZIP code 73089, within about 6 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=111SF
- Page: https://openairdocs.org/aircraft/N111SF

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 (Williams John J WILLIAMS CX4)

None in force.

### Matched by engine (Revmaster 2100D)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N111SF.

## FAA accident and incident reports

None matched to N111SF.

## 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 Williams John J WILLIAMS CX4 aircraft: https://openairdocs.org/model/williams-john-j-williams-cx4/aircraft.md
- The Revmaster 2100D engine: https://openairdocs.org/engine/revmaster-2100d.md

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