# N121TT: 1968 Bolkow PHOEBUS C

- Status: Valid registration
- Airframe: [Bolkow PHOEBUS C](https://openairdocs.org/model/bolkow-phoebus-c) (registry code 1403014, 1 seats)
- Engine: [NONE](https://openairdocs.org/engine/none) (registry code 00000)
- Data sheets: [TCDS G16EU](https://openairdocs.org/tcds/G16EU) (Airbus Defence and Space GmbH) (OpenAirDocs)
- Serial number: 819
- Year built: 1968
- Type: Glider
- Engine type: None
- Airworthiness: Experimental, exhibition
- Airworthiness date: April 4, 1978
- Certificate issued: June 29, 2020
- Expires: June 30, 2027
- Mode S code: A05924
- Registered owner: [Mahony John P](https://openairdocs.org/faa-owner/MAHONY%20JOHN%20P)
- Location: [Ballston Spa, NY](https://openairdocs.org/faa-place/NY/Ballston%20Spa)
- Owner type: Individual
- Owner's area on the map: 43.0017° N, 73.8701° W: Placed by OpenAirDocs at the center of ZIP code 12020, 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=121TT
- Page: https://openairdocs.org/aircraft/N121TT

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): 1 in force

### Matched by airframe (Bolkow PHOEBUS C)

- [AD 70-21-03](https://openairdocs.org/ad/70-21-03): Chute Coupling · Entwicklungsgemeinschaft Sport- und Segelflug Phoebus A1, Phoebus B1 and Phoebus C. Effective Nov 5, 1970

### Matched by engine (NONE)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N121TT.

## FAA accident and incident reports

None matched to N121TT.

## 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 Bolkow PHOEBUS C aircraft: https://openairdocs.org/model/bolkow-phoebus-c/aircraft.md
- The NONE engine: https://openairdocs.org/engine/none.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.