# N181BU: Moravan ZLIN 381

- Status: Valid registration
- Airframe: [Moravan ZLIN 381](https://openairdocs.org/model/moravan-zlin-381) (registry code 5920204, 2 seats)
- Engine: [Hirth HM-504](https://openairdocs.org/engine/hirth-hm-504) (registry code 33701)
- Serial number: 461
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Experimental, exhibition
- Airworthiness date: December 22, 1997
- Certificate issued: December 9, 1997
- Expires: January 31, 2029
- Mode S code: A1448F
- Registered owner: [Weeks Kermit A](https://openairdocs.org/faa-owner/WEEKS%20KERMIT%20A)
- Location: [Polk City, FL](https://openairdocs.org/faa-place/FL/Polk%20City)
- Owner type: Individual
- Owner's area on the map: 28.2676° N, 81.8538° W: Placed by OpenAirDocs at the center of ZIP code 33868, within about 8 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=181BU
- Page: https://openairdocs.org/aircraft/N181BU

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 (Moravan ZLIN 381)

None in force.

### Matched by engine (Hirth HM-504)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N181BU.

## FAA accident and incident reports

None matched to N181BU.

## 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 Moravan ZLIN 381 aircraft: https://openairdocs.org/model/moravan-zlin-381/aircraft.md
- The Hirth HM-504 engine: https://openairdocs.org/engine/hirth-hm-504.md

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