# N21ST: not currently registered

- Registered now: No (not in the FAA registry file). The mark may be reserved or free to assign
- Earlier aircraft: 1
- Last cancelled: July 9, 1991
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=21ST
- Page: https://openairdocs.org/aircraft/N21ST

## Aircraft that carried N21ST

- [Cancelled 1991-07-09](https://openairdocs.org/deregistered/N21ST-1991-07-09): Cessna 421B, S/N 421B0963. Owner: [St Paul Aviation](https://openairdocs.org/faa-owner/ST%20PAUL%20AVIATION), [St Paul, MN](https://openairdocs.org/faa-place/MN/St%20Paul)

## NTSB investigations on N21ST (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 MIA91FA023](https://openairdocs.org/ntsb/MIA91FA023), Nov 9, 1990: Cessna 421B (N21ST), Flamingo, FL, destroyed, 3 fatal. Probable cause: AN UNDETERMINED AIRFRAME/COMPONENT/SYSTEM FAILURE/MALFUNCTION, WHICH RESULTED IN A FUEL FED FIRE IN THE LEFT WING.

## FAA accident and incident reports on N21ST (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 19901109050129A](https://openairdocs.org/incident/19901109050129A), Nov 9, 1990: Cessna 421B (N21ST), Flamingo, FL, Destroyed, 3 fatal. Fire in left wing melted spar and explosion separated outboard section. Fuel leak in area. AD on boost pump overdue

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.