# N18521: 1937 Porterfield CP-40, registration cancelled 1948-05-11

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: May 11, 1948
- Status when cancelled: Valid registration
- Airframe: [Porterfield CP-40](https://openairdocs.org/model/porterfield-cp-40) (registry code 6480110)
- Serial number: 501
- Year built: 1937
- Type of aircraft: Fixed wing single engine
- Certificate issued: May 5, 1937
- Mode S code: A155F7
- Owner when cancelled: [Mitchell John S](https://openairdocs.org/faa-owner/MITCHELL%20JOHN%20S)
- Location: [Pesotum, IL](https://openairdocs.org/faa-place/IL/Pesotum)
- Owner type: Individual
- The mark today: https://openairdocs.org/aircraft/N18521
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=18521
- Page: https://openairdocs.org/deregistered/N18521-1948-05-11

From the FAA registry file of October 31, 2026, cancelled registrations. Owners' street addresses are left out. The Mode S code belongs to the N-number, not the airframe.

ADs and bulletins for the Porterfield CP-40: https://openairdocs.org/model/porterfield-cp-40.md

## Other aircraft with N18521

- [Registered now](https://openairdocs.org/aircraft/N18521): Cessna A185F, S/N 185-03812, built 1979
- [Cancelled 1990-03-14](https://openairdocs.org/deregistered/N18521-1990-03-14): Beech 58, S/N TH1297. Triennial form not returned
- [Cancelled 1973-06-26](https://openairdocs.org/deregistered/N18521-1973-06-26): Cessna 150L, S/N 15073910. Owner: [Three Star Aviation Inc](https://openairdocs.org/faa-owner/THREE%20STAR%20AVIATION%20INC), [Leroy, NY](https://openairdocs.org/faa-place/NY/Leroy)

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