# N121C: 2020 Craig Valentine SLING 4 TSI

- Status: Valid registration
- Airframe: [Craig Valentine SLING 4 TSI](https://openairdocs.org/model/craig-valentine-sling-4-tsi) (registry code 05639IP, 2 seats)
- Engine: [Rotax 915 ISC3 A](https://openairdocs.org/engine/rotax-915-isc3-a) (registry code 55621)
- Serial number: 170SK
- Year built: 2020
- Type: Fixed wing single engine
- Engine type: 4 cycle
- Kit: Airplane Factory SLING 4 TSI
- Airworthiness: Experimental, amateur built
- Airworthiness date: August 13, 2020
- Certificate issued: July 31, 2020
- Expires: July 31, 2027
- Mode S code: A0579B
- Registered owner: [Valentine Craig](https://openairdocs.org/faa-owner/VALENTINE%20CRAIG)
- Location: [Alameda, CA](https://openairdocs.org/faa-place/CA/Alameda)
- Owner type: Individual
- Owner's area on the map: 37.7747° N, 122.2781° W: Placed by OpenAirDocs at the center of ZIP code 94501, within about 2 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=121C
- Page: https://openairdocs.org/aircraft/N121C

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 (Craig Valentine SLING 4 TSI)

None in force.

### Matched by engine (Rotax 915 ISC3 A)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N121C.

## FAA accident and incident reports

None matched to N121C.

## 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 N121C

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N121C before.

- [Cancelled 2012-10-19](https://openairdocs.org/deregistered/N121C-2012-10-19): Aviat S-2C, S/N 6009, built 1998. Exported to Australia. Owner: [Benham Jerry](https://openairdocs.org/faa-owner/BENHAM%20JERRY), [Lorena, TX](https://openairdocs.org/faa-place/TX/Lorena)
- [Cancelled 1995-03-03](https://openairdocs.org/deregistered/N121C-1995-03-03): Cessna 550, S/N 5500354. Exported to Cayman Islands. Owner: [Digital Equipment Corporation](https://openairdocs.org/faa-owner/DIGITAL%20EQUIPMENT%20CORPORATION), [Bedford, MA](https://openairdocs.org/faa-place/MA/Bedford)
- [Cancelled 1953-11-12](https://openairdocs.org/deregistered/N121C-1953-11-12): Mooney M-18C, S/N 202. Owner: [Root Wilbur A](https://openairdocs.org/faa-owner/ROOT%20WILBUR%20A), [Lompoc, CA](https://openairdocs.org/faa-place/CA/Lompoc)

## Related

- Other Craig Valentine SLING 4 TSI aircraft: https://openairdocs.org/model/craig-valentine-sling-4-tsi/aircraft.md
- The Rotax 915 ISC3 A engine: https://openairdocs.org/engine/rotax-915-isc3-a.md

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