# N503Y: 1931 Unknown UNKNOWN, registration cancelled 1931-04-21

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: April 21, 1931
- Status when cancelled: Valid registration
- Airframe: [Unknown UNKNOWN](https://openairdocs.org/model/unknown-unknown) (registry code 9999999)
- Serial number: 100
- Year built: 1931
- Type of aircraft: Glider
- Mode S code: A6473B
- Owner type: Corporation
- The mark today: https://openairdocs.org/aircraft/N503Y
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=503Y
- Page: https://openairdocs.org/deregistered/N503Y-1931-04-21

From the FAA registry file of November 5, 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 N503Y

- [Registered now](https://openairdocs.org/aircraft/N503Y): Grumman G-164, S/N 353, built 1965

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