# N904UA: 2006 Benjamin D Eggers CHALLENGER II

- Status: Valid registration
- Airframe: [Benjamin D Eggers CHALLENGER II](https://openairdocs.org/model/benjamin-d-eggers-challenger-ii) (registry code 056397C, 2 seats)
- Engine: [Rotax 503 series](https://openairdocs.org/engine/rotax-503-series) (registry code 55564)
- Serial number: CH2-0506-2734
- Year built: 2006
- Type: Fixed wing single engine
- Engine type: 2 cycle
- Kit: Quad City Ultralight Acft Corp CHALLENGER II
- Airworthiness: Experimental, amateur built
- Airworthiness date: August 23, 2022
- Certificate issued: October 25, 2021
- Expires: October 31, 2028
- Mode S code: AC7FCB
- Registered owner: [Eggers Benjamin D](https://openairdocs.org/faa-owner/EGGERS%20BENJAMIN%20D)
- Location: [Cumberland Furnace, TN](https://openairdocs.org/faa-place/TN/Cumberland%20Furnace)
- Owner type: Individual
- Owner's area on the map: 36.3043° N, 87.4140° W: Placed by OpenAirDocs at the center of ZIP code 37051, 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=904UA
- Page: https://openairdocs.org/aircraft/N904UA

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 (Benjamin D Eggers CHALLENGER II)

None in force.

### Matched by engine (Rotax 503 series)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N904UA.

## FAA accident and incident reports

None matched to N904UA.

## 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 N904UA

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N904UA before.

- [Cancelled 2013-03-21](https://openairdocs.org/deregistered/N904UA-2013-03-21): Boeing 737-522, S/N 25004, built 1990. Owner: [United Air Lines Inc](https://openairdocs.org/faa-owner/UNITED%20AIR%20LINES%20INC), [Chicago, IL](https://openairdocs.org/faa-place/IL/Chicago)

## Related

- Other Benjamin D Eggers CHALLENGER II aircraft: https://openairdocs.org/model/benjamin-d-eggers-challenger-ii/aircraft.md
- The Rotax 503 series engine: https://openairdocs.org/engine/rotax-503-series.md

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