# N51M: Sommerfield Wally P51D

- Status: Valid registration
- Airframe: [Sommerfield Wally P51D](https://openairdocs.org/model/sommerfield-wally-p51d) (registry code 1690479, 1 seats)
- Engine: [Fairchild 6-440 series](https://openairdocs.org/engine/fairchild-6-440-series) (registry code 26003)
- Data sheets: [TCDS E-216](https://openairdocs.org/tcds/E-216) (Fairchild Engine Division Fairchild Engine and Airplane Corp.) (OpenAirDocs)
- Serial number: 25
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Experimental, amateur built
- Airworthiness date: November 8, 1991
- Certificate issued: January 9, 2021
- Expires: January 31, 2028
- Mode S code: A66029
- Registered owner: [Skerlich Alexander](https://openairdocs.org/faa-owner/SKERLICH%20ALEXANDER)
- Location: [Las Vegas, NV](https://openairdocs.org/faa-place/NV/Las%20Vegas)
- Owner type: Individual
- Owner's area on the map: 36.1453° N, 115.1866° W: Placed by OpenAirDocs at the center of ZIP code 89102, within about a mile (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=51M
- Page: https://openairdocs.org/aircraft/N51M

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 Fairchild 6-440 model are included.

## ADs that may apply (OpenAirDocs): 2 in force

### Matched by airframe (Sommerfield Wally P51D)

None in force.

### Matched by engine (Fairchild 6-440 series)

- [AD 54-09-01](https://openairdocs.org/ad/54-09-01): Carburetor Hotspot Heater Assembly · Fairchild Engine Division, Fairchild Engine and 6-440-C2 (L-440-1), 6-440-C3, 6-440-C4 and 1 more
- [AD 52-03-01](https://openairdocs.org/ad/52-03-01): Pistons · Fairchild Engine Division, Fairchild Engine and 6-440-C2 (L-440-1), 6-440-C3, 6-440-C4 and 1 more

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N51M.

## FAA accident and incident reports (1)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Incident 19900128013719I](https://openairdocs.org/incident/19900128013719I), Jan 28, 1990: Wara/C P51HALFSIZE (N51M), Las Vegas, NV, Minor damage. Right landing gear folded on landing rollout. Pilot stated he doesnt know what happened.

## 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) (6)

Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do.

### Approved for the engine (Fairchild 6-440 series)

- [STC SE04651CH](https://openairdocs.org/stc/SE04651CH): To allow use of l00R grade aviation fuel meeting Swift Fuel, LLC specification SPEC-l00R-22. Swift Fuels LLC. Lists 6-440-C2 (L-440-1)
- [STC SE01966WI](https://openairdocs.org/stc/SE01966WI): Use of GAMI G100UL High Octane Unleaded Avgas in spark ignition piston aircraft engines. General Aviation Modifications Inc. Lists 6-440-C2 (L-440-1)
- [STC SE8776SW](https://openairdocs.org/stc/SE8776SW): Installation of coated cylinders and piston rings. Continental Motors, Inc
- [STC SE1-201](https://openairdocs.org/stc/SE1-201): Installation of the Richter Aero Equipment Type B-4 or B-5 Temperature Probe. (O-360 SERIES (excl. A1C, C2B, C2D)). MidContinent Instru Co Inc. Lists 6-440-C5
- [STC SE00129WI](https://openairdocs.org/stc/SE00129WI): Approved fuel: Unleaded automotive gasoline, 87 minimum antiknock index and leaded automotive gasoline, 88 minimum antiknock index(RON+MON)/2, per ASTM Spec D-439. Petersen Aviation Inc. Lists 6-440-C2
- [STC SE519AL](https://openairdocs.org/stc/SE519AL): Installation of Ramsey Corporation piston rings. Aircraft Rebuilders, Inc. Lists 6-440-C5

## Earlier aircraft with N51M

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N51M before.

- [Cancelled 1982-12-01](https://openairdocs.org/deregistered/N51M-1982-12-01): Beech E18S, S/N BA-239. Owner: [Green Aero Inc](https://openairdocs.org/faa-owner/GREEN%20AERO%20INC), [Flint, MI](https://openairdocs.org/faa-place/MI/Flint)
- [Cancelled 1933-02-11](https://openairdocs.org/deregistered/N51M-1933-02-11): Standard J-1, S/N 1 M O SUB. Owner: [Gordon B Oakley](https://openairdocs.org/faa-owner/GORDON%20B%20OAKLEY), [Kansas City, KS](https://openairdocs.org/faa-place/KS/Kansas%20City)

## Related

- Other Sommerfield Wally P51D aircraft: https://openairdocs.org/model/sommerfield-wally-p51d/aircraft.md
- The Fairchild 6-440 series engine: https://openairdocs.org/engine/fairchild-6-440-series.md

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