# N54P: Unknown UNKNOWN, registration cancelled 1965-05-21

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: May 21, 1965
- Status when cancelled: Valid registration
- Airframe: [Unknown UNKNOWN](https://openairdocs.org/model/unknown-unknown) (registry code 9999999)
- Serial number: 6
- Type of aircraft: Glider
- Certificate issued: December 4, 1959
- Mode S code: A6D6D8
- Owner when cancelled: [Waterman D Waldo DBA Waterman Research Eng Co](https://openairdocs.org/faa-owner/WATERMAN%20D%20WALDO%20DBA%20WATERMAN%20RESEARCH%20ENG%20CO)
- Location: [San Diego, CA](https://openairdocs.org/faa-place/CA/San%20Diego)
- Owner type: Corporation
- The mark today: https://openairdocs.org/aircraft/N54P
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=54P
- Page: https://openairdocs.org/deregistered/N54P-1965-05-21

From the FAA registry file of November 3, 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 Unknown UNKNOWN: https://openairdocs.org/model/unknown-unknown.md

## Other aircraft with N54P

- [Registered now](https://openairdocs.org/aircraft/N54P): Embraer EMB-550, S/N 55020230, built 2025
- [Cancelled 2013-04-09](https://openairdocs.org/deregistered/N54P-2013-04-09): Pasco MINI MUSTANG P51, S/N 57140, built 1979. Registration expired, pending cancellation. Owner: [Oppegard Nicholas D](https://openairdocs.org/faa-owner/OPPEGARD%20NICHOLAS%20D), [Seattle, WA](https://openairdocs.org/faa-place/WA/Seattle)

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