# N4643S: Sikorsky S-52-3, registration cancelled 1993-07-20

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: July 20, 1993
- Exported to: United Kingdom
- Status when cancelled: Triennial form not returned
- Airframe: [Sikorsky S-52-3](https://openairdocs.org/model/sikorsky-s-52-3) (registry code 8141306)
- Data sheets: [TCDS 1H2](https://openairdocs.org/tcds/1H2) (OpenAirDocs)
- Serial number: 125521
- Type of aircraft: Rotorcraft
- Certificate issued: October 6, 1992
- Last registry action: September 20, 1995
- Mode S code: A5AB49
- Owner when cancelled: [Vertical Aviation Technologies Inc](https://openairdocs.org/faa-owner/VERTICAL%20AVIATION%20TECHNOLOGIES%20INC)
- Location: [Sanford, FL](https://openairdocs.org/faa-place/FL/Sanford)
- Owner type: Corporation
- Owner's area on the map: 28.7521° N, 81.2463° W: Placed by OpenAirDocs at the center of ZIP code 32773, within about 3 miles (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N4643S
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=4643S
- Page: https://openairdocs.org/deregistered/N4643S-1993-07-20

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 Sikorsky S-52-3: https://openairdocs.org/model/sikorsky-s-52-3.md

## NTSB investigations (2)

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 MIA78FLD32](https://openairdocs.org/ntsb/MIA78FLD32), Apr 4, 1978: Sikorsky S-52-3 (N4643S), Eustis, FL, substantial damage
- [NTSB UNK69X0108](https://openairdocs.org/ntsb/UNK69X0108), Feb 3, 1969: Sikorsky S-52-3 (N4643S), Santo Domingo (Atlantic Ocean), substantial damage

## FAA accident and incident reports (1)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Accident 19780404006989A](https://openairdocs.org/incident/19780404006989A), Apr 4, 1978: Skrsky S523 (N4643S), Eustis, FL, Substantial damage. Connecting rod cap bolt failed in center left cylinder. Piston rinad not fully seated.

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