# N5998M: 1972 Cessna 421B, registration cancelled 2009-08-18

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: August 18, 2009
- Status when cancelled: Sale reported
- Airframe: [Cessna 421B](https://openairdocs.org/model/cessna-421b) (registry code 2076014)
- Engine: [Continental GTSI0-520-F-K](https://openairdocs.org/engine/continental-gtsi0-520-f-k) (registry code 17031)
- Data sheets: [TCDS A7CE](https://openairdocs.org/tcds/A7CE) (OpenAirDocs)
- Serial number: 421B0241
- Year built: 1972
- Type of aircraft: Fixed wing multi engine
- Engine type: Reciprocating
- Airworthiness: Standard, normal
- Airworthiness date: July 6, 1972
- Last registry action: January 12, 2009
- Mode S code: A7C252
- Location: [Coronado, CA](https://openairdocs.org/faa-place/CA/Coronado)
- Owner type: Individual
- Owner's area on the map: 32.6986° N, 117.2088° W: Placed by OpenAirDocs at the center of ZIP code 92118, within about 2 miles (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N5998M
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=5998M
- Page: https://openairdocs.org/deregistered/N5998M-2009-08-18

From the FAA registry file of November 3, 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 (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 FTW77FRA35](https://openairdocs.org/ntsb/FTW77FRA35), Sep 23, 1977: Cessna 421B (N5998M), Houston, TX, substantial damage
- [NTSB CHI74FEC30](https://openairdocs.org/ntsb/CHI74FEC30), Feb 12, 1974: Cessna 421B (N5998M), Flint, MI, substantial damage

## FAA accident and incident reports (2)

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 19770923030849A](https://openairdocs.org/incident/19770923030849A), Sep 23, 1977: Cessna 421 (N5998M), Houston, TX, Substantial damage
- [Accident 19740212003259A](https://openairdocs.org/incident/19740212003259A), Feb 12, 1974: Cessna 421B (N5998M), Flint, MI, Substantial damage. Fld cond rpt not obtnd by twr ctlr. Plowed sno intx RWY5-36.acft clrd lnd rwy 5.

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