# N4220A: Piper L-21A, registration cancelled 1981-01-20

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: January 20, 1981
- Status when cancelled: Valid registration
- Airframe: [Piper L-21A](https://openairdocs.org/model/piper-l-21a) (registry code 7101814)
- Serial number: 18-894
- Type of aircraft: Fixed wing single engine
- Certificate issued: July 2, 1968
- Mode S code: A50566
- Owner when cancelled: [Department Of The Army](https://openairdocs.org/faa-owner/DEPARTMENT%20OF%20THE%20ARMY)
- Location: [Fort Knox, KY](https://openairdocs.org/faa-place/KY/Fort%20Knox)
- Owner type: Government
- The mark today: https://openairdocs.org/aircraft/N4220A
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=4220A
- Page: https://openairdocs.org/deregistered/N4220A-1981-01-20

From the FAA registry file of October 29, 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 Piper L-21A: https://openairdocs.org/model/piper-l-21a.md

## NTSB investigations (3)

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 CHI72DLQ14](https://openairdocs.org/ntsb/CHI72DLQ14), Sep 22, 1971: Piper PA-18 (N4220A), Fort Knox, KY, substantial damage
- [NTSB CHI71DGJ10](https://openairdocs.org/ntsb/CHI71DGJ10), Aug 22, 1970: Piper PA-18 (N4220A), Ft.Knox, KY, substantial damage
- [NTSB NYC65F/UOK](https://openairdocs.org/ntsb/NYC65F%2FUOK), Apr 5, 1965: Piper PA-18 (N4220A), Ft Eustis, VA, substantial damage

## Other aircraft with N4220A

- [Registered now](https://openairdocs.org/aircraft/N4220A): Ea Vision EA J100, S/N 85367
- [Cancelled 2010-12-20](https://openairdocs.org/deregistered/N4220A-2010-12-20): Air Tractor AT-802A, S/N 802A-0369, built 2010. Exported to Australia. Owner: [Johnston Aircraft Service Inc](https://openairdocs.org/faa-owner/JOHNSTON%20AIRCRAFT%20SERVICE%20INC), [Tulare, CA](https://openairdocs.org/faa-place/CA/Tulare)

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