# N21SR: Oneill Terrence Z

- Status: Valid registration
- Airframe: [Oneill Terrence Z](https://openairdocs.org/model/oneill-terrence-z) (registry code 05612FT, 4 seats)
- Serial number: 1
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Certificate issued: July 21, 1987
- Expires: October 31, 2027
- Mode S code: A1B8C9
- Registered owner: [Oneill Terrence](https://openairdocs.org/faa-owner/ONEILL%20TERRENCE)
- Location: [Niwot, CO](https://openairdocs.org/faa-place/CO/Niwot)
- Owner type: Individual
- Owner's area on the map: 40.1694° N, 105.2109° W: Placed by OpenAirDocs at the center of ZIP code 80503, 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=21SR
- Page: https://openairdocs.org/aircraft/N21SR

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 (Oneill Terrence Z)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N21SR.

## FAA accident and incident reports

None matched to N21SR.

## 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 Oneill Terrence Z aircraft: https://openairdocs.org/model/oneill-terrence-z/aircraft.md

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