# N18121: 1937 Douglas DC3A

- Status: Valid registration
- Airframe: [Douglas DC3A](https://openairdocs.org/model/douglas-dc3a) (registry code 3021433, 32 seats)
- Engine: [Pratt & Whitney R-1830 series](https://openairdocs.org/engine/pratt-whitney-r-1830-series) (registry code 52020)
- Serial number: 1997
- Year built: 1937
- Type: Fixed wing multi engine
- Engine type: Reciprocating
- Airworthiness: Standard, normal
- Airworthiness date: June 9, 1953
- Certificate issued: September 11, 2007
- Expires: April 30, 2028
- Mode S code: A1471B
- Registered owner: [Blue Skies Air LLC](https://openairdocs.org/faa-owner/BLUE%20SKIES%20AIR%20LLC)
- Location: [Portland, OR](https://openairdocs.org/faa-place/OR/Portland)
- Owner type: LLC
- Owner's area on the map: 45.5184° N, 122.6739° W: Placed by OpenAirDocs at the center of ZIP code 97204, 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=18121
- Page: https://openairdocs.org/aircraft/N18121

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 Pratt & Whitney R-1830 model are included.

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

### Matched by airframe (Douglas DC3A)

None in force.

### Matched by engine (Pratt & Whitney R-1830 series)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N18121.

## FAA accident and incident reports

None matched to N18121.

## 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 N18121

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N18121 before.

- [Cancelled 1991-07-09](https://openairdocs.org/deregistered/N18121-1991-07-09): Beech F90, S/N LA144. Exported to Brazil. Owner: [Jim Lafferty Aircraft Sales Inc](https://openairdocs.org/faa-owner/JIM%20LAFFERTY%20AIRCRAFT%20SALES%20INC), [San Jose, CA](https://openairdocs.org/faa-place/CA/San%20Jose)

## Related

- Other Douglas DC3A aircraft: https://openairdocs.org/model/douglas-dc3a/aircraft.md
- The Pratt & Whitney R-1830 series engine: https://openairdocs.org/engine/pratt-whitney-r-1830-series.md

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