# N16SL: 2021 Steve Lemke CHALLENGER II

- Status: Valid registration
- Airframe: [Steve Lemke CHALLENGER II](https://openairdocs.org/model/steve-lemke-challenger-ii) (registry code 05637QI, 2 seats)
- Engine: [Rotax 503 series](https://openairdocs.org/engine/rotax-503-series) (registry code 55564)
- Serial number: CH2-0292-B-0818
- Year built: 2021
- Type: Fixed wing single engine
- Engine type: 2 cycle
- Airworthiness: Experimental, amateur built
- Airworthiness date: January 18, 2022
- Certificate issued: December 16, 2024
- Expires: December 31, 2031
- Mode S code: A0F0F0
- Registered owner: [Williams Phillip](https://openairdocs.org/faa-owner/WILLIAMS%20PHILLIP)
- Location: [Birmingham, AL](https://openairdocs.org/faa-place/AL/Birmingham)
- Owner type: Individual
- Owner's area on the map: 33.6153° N, 86.6454° W: Placed by OpenAirDocs at the center of ZIP code 35235, within about 2 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=16SL
- Page: https://openairdocs.org/aircraft/N16SL

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 (Steve Lemke CHALLENGER II)

None in force.

### Matched by engine (Rotax 503 series)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N16SL.

## FAA accident and incident reports

None matched to N16SL.

## 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 N16SL

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N16SL before.

- [Cancelled 2013-04-18](https://openairdocs.org/deregistered/N16SL-2013-04-18): Beech E18S, S/N BA-65, built 1955. Sale reported, pending cancellation. Owner: [Okla City, OK](https://openairdocs.org/faa-place/OK/Okla%20City)

## Related

- Other Steve Lemke CHALLENGER II aircraft: https://openairdocs.org/model/steve-lemke-challenger-ii/aircraft.md
- The Rotax 503 series engine: https://openairdocs.org/engine/rotax-503-series.md

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