# N1940S: 1943 Lockheed 18-56

- Status: Valid registration
- Airframe: [Lockheed 18-56](https://openairdocs.org/model/lockheed-18-56) (registry code 5261642, 17 seats)
- Engine: [Wright C9GC&D series](https://openairdocs.org/engine/wright-c9gc-d-series) (registry code 67027)
- Serial number: 2509
- Year built: 1943
- Type: Fixed wing multi engine
- Engine type: Reciprocating
- Airworthiness: Standard
- Airworthiness date: December 13, 1955
- Certificate issued: November 22, 2011
- Expires: November 30, 2027
- Mode S code: A17970
- Registered owner: [Glover William Scott](https://openairdocs.org/faa-owner/GLOVER%20WILLIAM%20SCOTT)
- Location: [Mount Pleasant, TX](https://openairdocs.org/faa-place/TX/Mount%20Pleasant)
- Owner type: Individual
- Owner's area on the map: 33.1582° N, 94.9745° W: Placed by OpenAirDocs: center of Mount Pleasant, TX, 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=1940S
- Page: https://openairdocs.org/aircraft/N1940S

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 Wright C9GC&D model are included.

## ADs that may apply (OpenAirDocs): 0 in force

### Matched by airframe (Lockheed 18-56)

None in force.

### Matched by engine (Wright C9GC&D series)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations (2)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB UNK68X0131](https://openairdocs.org/ntsb/UNK68X0131), Apr 12, 1968: Lockheed 18 (N1940S), Loreto, Mexico, substantial damage
- [NTSB LAX68D0418](https://openairdocs.org/ntsb/LAX68D0418), Apr 11, 1968: Lockheed 18 (N1940S), Loreto, Mexico, substantial damage

## FAA accident and incident reports

None matched to N1940S.

## 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 Lockheed 18-56 aircraft: https://openairdocs.org/model/lockheed-18-56/aircraft.md
- The Wright C9GC&D series engine: https://openairdocs.org/engine/wright-c9gc-d-series.md

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