# N251B: 1979 Schleicher ASW-20

- Status: Valid registration
- Airframe: [Schleicher ASW-20](https://openairdocs.org/model/schleicher-asw-20) (registry code 3801506, 1 seats)
- Engine: [NONE](https://openairdocs.org/engine/none) (registry code 00000)
- Serial number: 20274
- Year built: 1979
- Type: Glider
- Engine type: None
- Airworthiness: Experimental, racing
- Airworthiness date: May 15, 1980
- Certificate issued: December 27, 2017
- Expires: December 31, 2027
- Mode S code: A25B4E
- Registered owner: [Anklam Thomas M](https://openairdocs.org/faa-owner/ANKLAM%20THOMAS%20M)
- Location: [Dublin, CA](https://openairdocs.org/faa-place/CA/Dublin)
- Owner type: Individual
- Owner's area on the map: 37.7160° N, 121.9011° W: Placed by OpenAirDocs at the center of ZIP code 94568, within about 2 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=251B
- Page: https://openairdocs.org/aircraft/N251B

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 (Schleicher ASW-20)

None in force.

### Matched by engine (NONE)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N251B.

## FAA accident and incident reports

None matched to N251B.

## 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 N251B

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N251B before.

- [Cancelled 1998-09-28](https://openairdocs.org/deregistered/N251B-1998-09-28): Piper AEROSTAR 601P, S/N 61P08128063422. Owner: [Hegg Mark](https://openairdocs.org/faa-owner/HEGG%20MARK), [Boulder, CO](https://openairdocs.org/faa-place/CO/Boulder)
- [Cancelled 1977-11-25](https://openairdocs.org/deregistered/N251B-1977-11-25): Aero Commander 680T, S/N 1587, built 1966. Exported to Canada. Owner: [Dean John H](https://openairdocs.org/faa-owner/DEAN%20JOHN%20H), [Fort Worth, TX](https://openairdocs.org/faa-place/TX/Fort%20Worth)
- [Cancelled 1964-07-21](https://openairdocs.org/deregistered/N251B-1964-07-21): Colonial C-1, S/N 11. Exported to Canada. Owner: [Powers William J](https://openairdocs.org/faa-owner/POWERS%20WILLIAM%20J), [Tiburon, CA](https://openairdocs.org/faa-place/CA/Tiburon)

## Related

- Other Schleicher ASW-20 aircraft: https://openairdocs.org/model/schleicher-asw-20/aircraft.md
- The NONE engine: https://openairdocs.org/engine/none.md

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