# N556ST: Greg Johnson CALIDUS

- Status: Valid registration
- Airframe: [Greg Johnson CALIDUS](https://openairdocs.org/model/greg-johnson-calidus) (registry code 05633DK, 2 seats)
- Engine: [Rotax 912ULS series](https://openairdocs.org/engine/rotax-912uls-series) (registry code 55572)
- Serial number: C00294
- Type: Rotorcraft
- Engine type: 4 cycle
- Kit: Autogyro Gmbh CALIDUS
- Airworthiness: Experimental, amateur built
- Airworthiness date: March 20, 2014
- Certificate issued: March 25, 2020
- Expires: March 31, 2030
- Mode S code: A71757
- Registered owner: [Earley Marlin Eugene](https://openairdocs.org/faa-owner/EARLEY%20MARLIN%20EUGENE)
- Location: [Waco, TX](https://openairdocs.org/faa-place/TX/Waco)
- Owner type: Individual
- Owner's area on the map: 31.5216° N, 97.2610° W: Placed by OpenAirDocs at the center of ZIP code 76712, 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=556ST
- Page: https://openairdocs.org/aircraft/N556ST

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. The registry lists only the engine series, so ADs for every Rotax 912ULS model are included.

## ADs that may apply (OpenAirDocs): 0 in force

### Matched by airframe (Greg Johnson CALIDUS)

None in force.

### Matched by engine (Rotax 912ULS series)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N556ST.

## FAA accident and incident reports

None matched to N556ST.

## 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 Greg Johnson CALIDUS aircraft: https://openairdocs.org/model/greg-johnson-calidus/aircraft.md
- The Rotax 912ULS series engine: https://openairdocs.org/engine/rotax-912uls-series.md

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