# N4021S: not currently registered

- Registered now: No (not in the FAA registry file). The mark may be reserved or free to assign
- Earlier aircraft: 2
- Last cancelled: November 8, 2013
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=4021S
- Page: https://openairdocs.org/aircraft/N4021S

## Aircraft that carried N4021S

- [Cancelled 2013-11-08](https://openairdocs.org/deregistered/N4021S-2013-11-08): Ayres S2R-600, S/N 2561R, built 1980. Exported to Guatemala. Owner: [Aircraft Escrow & Title Co](https://openairdocs.org/faa-owner/AIRCRAFT%20ESCROW%20%26%20TITLE%20CO), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington)
- [Cancelled 1972-05-23](https://openairdocs.org/deregistered/N4021S-1972-05-23): Sikorsky S-61D, S/N 61497. Exported to Argentina. Owner: [Sikorsky Aircraft Division United Aircraft Corp](https://openairdocs.org/faa-owner/SIKORSKY%20AIRCRAFT%20DIVISION%20UNITED%20AIRCRAFT%20CORP), [Stratford, CT](https://openairdocs.org/faa-place/CT/Stratford)

## NTSB investigations on N4021S (1)

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 WPR11LA366](https://openairdocs.org/ntsb/WPR11LA366), Aug 3, 2011: Ayres S2R-600 (N4021S), Hazelton, ID, substantial damage. Probable cause: Partial loss of engine power for undetermined reasons.

## FAA accident and incident reports on N4021S (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 20110803016199A](https://openairdocs.org/incident/20110803016199A), Aug 3, 2011: Ayres Corporation S2R-600 (N4021S), Hazelton, ID, Substantial damage. On the 7th flight of the day, cruising to the field, the engine started to loose power. The pilot added flaps in order to clear a power line. The aircraft…

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