This aircraft's FAA registration was cancelled on Oct 1974 — it's no longer an active tail number. TailWiki keeps a record so its history isn't lost.

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N421MMCessna 421B · 1974

DeregisteredStandardCont Motor GTSIO-520-CSpartanburg, SC

N421MM is a 1974 Cessna 421B. It is a fixed-wing multi-engine aircraft with 8 seats, powered by a Cont Motor GTSIO-520-C rated at 340 horsepower. Its registration was cancelled in Oct 1974. Its standard airworthiness certificate was issued in Mar 2021. This page also carries 1 NTSB event.

1 of 242 Cessna 421B

FAA recordRegistered in Spartanburg, SC in 2018 · deregistered in 1974.

More like this:Cessna 421B Aircraft in South Carolina Standard

2021

FAA record · Mar 2021 · Airworthiness

Airworthiness certificate issued — Standard

Manufacturer: Cessna. Model 421B. Serial 421B0804.

2018

FAA record · Feb 2018 · Registration

Registered to last known owner

Registrant based in Spartanburg, SC.

1974

FAA record · Oct 1974 · Deregistered

FAA registration cancelled

This N-number is no longer an active registration — it may have been scrapped, exported, or the number retired. The FAA can reissue cancelled N-numbers to a different aircraft entirely.

Aircraft

ManufacturerCessna

Model421B

Year1974

CategoryStandard

TypeFixed-wing multi-engine

Serial421B0804

EngineCont Motor GTSIO-520-C

Horsepower340

Seats8

BasedSpartanburg, SC

Safety record

1 NTSB event on record

Most recent: Jun 2018 · Fatal injuries.

See the Safety tab for full reports.

Registration history

Oct 1974

FAA registration cancelled

2018 — 1974

Last known registered owner · Spartanburg, SC

Mar 2021

Airworthiness certificate issued

Owner locations generalized to city/state for privacy. Ownership lineage grows as TailWiki tracks daily FAA updates.

View earlier registration history

TailWiki has tracked this tail since Aug 2026. The FAA registry is a snapshot, not a history — earlier owners aren't in the public record. TailWiki reconstructs ownership changes by watching daily FAA updates going forward, so this section fills in the longer TailWiki runs.

About this record

This N-number isn't actively registered, so it can't be claimed. If the FAA reissues it to a different aircraft, that new registration gets its own page.

Keep up with N421MM

Get an alert when this aircraft's registration or ownership changes. Registry updates only — never location or flight tracking.