# N21ST: Cessna 421B, registration cancelled 1991-07-09

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: July 9, 1991
- Status when cancelled: Valid registration
- Airframe: [Cessna 421B](https://openairdocs.org/model/cessna-421b) (registry code 2076014)
- Data sheets: [TCDS A7CE](https://openairdocs.org/tcds/A7CE) (OpenAirDocs)
- Serial number: 421B0963
- Type of aircraft: Fixed wing multi engine
- Certificate issued: June 18, 1990
- Last registry action: July 2, 1990
- Mode S code: A1B8CB
- Owner when cancelled: [St Paul Aviation](https://openairdocs.org/faa-owner/ST%20PAUL%20AVIATION)
- Location: [St Paul, MN](https://openairdocs.org/faa-place/MN/St%20Paul)
- Owner type: Corporation
- Owner's area on the map: 44.9508° N, 93.0876° W: Placed by OpenAirDocs at the center of ZIP code 55101, within about a mile (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N21ST
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=21ST
- Page: https://openairdocs.org/deregistered/N21ST-1991-07-09

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 Cessna 421B: https://openairdocs.org/model/cessna-421b.md

## NTSB investigations (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 (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

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