# N631H: 1971 Bryan HP-11-A

- Status: Valid registration
- Airframe: [Bryan HP-11-A](https://openairdocs.org/model/bryan-hp-11-a) (registry code 05603EF, 1 seats)
- Engine: [NONE](https://openairdocs.org/engine/none) (registry code 00000)
- Serial number: 66
- Year built: 1971
- Type: Glider
- Engine type: None
- Airworthiness: Experimental, amateur built
- Airworthiness date: April 4, 1980
- Certificate issued: April 10, 2023
- Expires: April 30, 2030
- Mode S code: A84222
- Registered owner: [Mazzetti Robert A](https://openairdocs.org/faa-owner/MAZZETTI%20ROBERT%20A)
- Location: [Austin, TX](https://openairdocs.org/faa-place/TX/Austin)
- Owner type: Individual
- Owner's area on the map: 30.2964° N, 97.8080° W: Placed by OpenAirDocs at the center of ZIP code 78746, within about 3 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=631H
- Page: https://openairdocs.org/aircraft/N631H

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 (Bryan HP-11-A)

None in force.

### Matched by engine (NONE)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N631H.

## FAA accident and incident reports

None matched to N631H.

## 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 Bryan HP-11-A aircraft: https://openairdocs.org/model/bryan-hp-11-a/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.