# N503MX: 2020 Bonzer Mark MXL

- Status: Valid registration
- Airframe: [Bonzer Mark MXL](https://openairdocs.org/model/bonzer-mark-mxl) (registry code 056386I, 1 seats)
- Engine: [Rotax 503 series](https://openairdocs.org/engine/rotax-503-series) (registry code 55564)
- Serial number: 0104
- Year built: 2020
- Type: Fixed wing single engine
- Engine type: 2 cycle
- Airworthiness: Experimental, amateur built
- Airworthiness date: April 22, 2020
- Certificate issued: December 13, 2023
- Expires: December 31, 2030
- Mode S code: A6463E
- Registered owner: [Oast Thomas](https://openairdocs.org/faa-owner/OAST%20THOMAS)
- Location: [Sedan, KS](https://openairdocs.org/faa-place/KS/Sedan)
- Owner type: Individual
- Owner's area on the map: 37.1311° N, 96.2179° W: Placed by OpenAirDocs at the center of ZIP code 67361, within about 9 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=503MX
- Page: https://openairdocs.org/aircraft/N503MX

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 503 model are included.

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

### Matched by airframe (Bonzer Mark MXL)

None in force.

### Matched by engine (Rotax 503 series)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N503MX.

## FAA accident and incident reports

None matched to N503MX.

## 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 N503MX

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N503MX before.

- [Cancelled 2005-06-14](https://openairdocs.org/deregistered/N503MX-2005-06-14): Filer Ted H III MINI-MAX EROS, S/N 20672. Triennial form not returned. Owner: [Filer Ted H III](https://openairdocs.org/faa-owner/FILER%20TED%20H%20III), [Baytown, TX](https://openairdocs.org/faa-place/TX/Baytown)

## Related

- Other Bonzer Mark MXL aircraft: https://openairdocs.org/model/bonzer-mark-mxl/aircraft.md
- The Rotax 503 series engine: https://openairdocs.org/engine/rotax-503-series.md

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.