# N447EA: 2023 Tomark Aero CZ Sro VIPER SD-4

- Status: Valid registration
- Airframe: [Tomark Aero CZ Sro VIPER SD-4](https://openairdocs.org/model/tomark-aero-cz-sro-viper-sd-4) (registry code 060007X, 2 seats)
- Engine: [Rotax 912ULS2](https://openairdocs.org/engine/rotax-912uls2) (registry code 55599)
- Serial number: 41147
- Year built: 2023
- Type: Fixed wing single engine
- Engine type: 4 cycle
- Airworthiness: Light sport, airplane
- Airworthiness date: December 9, 2023
- Certificate issued: August 26, 2026
- Expires: August 31, 2033
- Mode S code: A56503
- Registered owner: [Management Ranch LLC](https://openairdocs.org/faa-owner/MANAGEMENT%20RANCH%20LLC)
- Location: [Sheridan, WY](https://openairdocs.org/faa-place/WY/Sheridan)
- Owner type: LLC
- Owner's area on the map: 44.8325° N, 106.8963° W: Placed by OpenAirDocs at the center of ZIP code 82801, within about 13 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=447EA
- Page: https://openairdocs.org/aircraft/N447EA

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 (Tomark Aero CZ Sro VIPER SD-4)

None in force.

### Matched by engine (Rotax 912ULS2)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N447EA.

## FAA accident and incident reports (1)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Incident 20250912017969I](https://openairdocs.org/incident/20250912017969I), Sep 12, 2025: Tomark Aero Cz Sro VIPER SD-4 (N447EA), Creve Coeur, MO, Minor damage. A student pilot, on solo flight, was practicing take off and landings. During the flare to land, the aircraft began to porpoise resulting in a hard landing.…

## 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 N447EA

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N447EA before.

- [Cancelled 2013-07-29](https://openairdocs.org/deregistered/N447EA-2013-07-29): Bowen David SPORT, S/N 80701. Registration expired, pending cancellation. Owner: [Bowen David W](https://openairdocs.org/faa-owner/BOWEN%20DAVID%20W), [Tucson, AZ](https://openairdocs.org/faa-place/AZ/Tucson)

## Related

- Other Tomark Aero CZ Sro VIPER SD-4 aircraft: https://openairdocs.org/model/tomark-aero-cz-sro-viper-sd-4/aircraft.md
- The Rotax 912ULS2 engine: https://openairdocs.org/engine/rotax-912uls2.md

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