# N56SY: 2025 SD Young INV ZENITH 750 STOL

- Status: Valid registration
- Airframe: [SD Young INV ZENITH 750 STOL](https://openairdocs.org/model/sd-young-inv-zenith-750-stol) (registry code 05643IR, 2 seats)
- Engine: [Ulpower 350IS](https://openairdocs.org/engine/ulpower-350is) (registry code 63046)
- Serial number: 75-12030
- Year built: 2025
- Type: Fixed wing single engine
- Engine type: 4 cycle
- Kit: Zenith Aircraft Co STOL CH 750
- Airworthiness: Experimental, amateur built
- Airworthiness date: November 17, 2025
- Certificate issued: November 4, 2025
- Expires: November 30, 2032
- Mode S code: A72638
- Registered owner: [Sd Young Inv LLC](https://openairdocs.org/faa-owner/SD%20YOUNG%20INV%20LLC)
- Location: [St George, UT](https://openairdocs.org/faa-place/UT/St%20George)
- Owner type: LLC
- Owner's area on the map: 37.0461° N, 113.5573° W: Placed by OpenAirDocs at the center of ZIP code 84790, 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=56SY
- Page: https://openairdocs.org/aircraft/N56SY

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 (SD Young INV ZENITH 750 STOL)

None in force.

### Matched by engine (Ulpower 350IS)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N56SY.

## FAA accident and incident reports

None matched to N56SY.

## 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 SD Young INV ZENITH 750 STOL aircraft: https://openairdocs.org/model/sd-young-inv-zenith-750-stol/aircraft.md
- The Ulpower 350IS engine: https://openairdocs.org/engine/ulpower-350is.md

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