# N6991X: 2003 Quad Cities CHALLENGER II

- Status: Valid registration
- Airframe: [Quad Cities CHALLENGER II](https://openairdocs.org/model/quad-cities-challenger-ii) (registry code 05904CD, 2 seats)
- Engine: [Rotax 503 series](https://openairdocs.org/engine/rotax-503-series) (registry code 55564)
- Serial number: QCCII-CW-6991-001
- Year built: 2003
- Type: Fixed wing single engine
- Engine type: 2 cycle
- Airworthiness: Experimental, registered before 01/31/08
- Airworthiness date: November 16, 2007
- Certificate issued: November 5, 2007
- Expires: February 28, 2029
- Mode S code: A94EB6
- Registered owner: [French Scott B](https://openairdocs.org/faa-owner/FRENCH%20SCOTT%20B)
- Location: [Central City, IA](https://openairdocs.org/faa-place/IA/Central%20City)
- Owner type: Individual
- Owner's area on the map: 42.1880° N, 91.5094° W: Placed by OpenAirDocs at the center of ZIP code 52214, within about 5 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=6991X
- Page: https://openairdocs.org/aircraft/N6991X

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 (Quad Cities CHALLENGER II)

None in force.

### Matched by engine (Rotax 503 series)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N6991X.

## FAA accident and incident reports

None matched to N6991X.

## 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 N6991X

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N6991X before.

- [Cancelled 1961-01-30](https://openairdocs.org/deregistered/N6991X-1961-01-30): Cessna 172B, S/N 17247891. Exported to Angola. Owner: [Cessna Aicraft Co](https://openairdocs.org/faa-owner/CESSNA%20AICRAFT%20CO), [Wichita, KS](https://openairdocs.org/faa-place/KS/Wichita)

## Related

- Other Quad Cities CHALLENGER II aircraft: https://openairdocs.org/model/quad-cities-challenger-ii/aircraft.md
- The Rotax 503 series engine: https://openairdocs.org/engine/rotax-503-series.md

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