N421DK Revoked

This aircraft — FAA registration facts

N421DK is a 1974 Cessna 421B (serial 421B0825), registered to Registration Pending (individual) in Sonoma, CA. Its FAA registration is recorded as revoked; the airworthiness certificate dates from November 1974 (51 years ago). It carries 2 Cont Motor GTSIO-520-C engines rated at 340 hp each (680 hp total), the engine on 63% of registered Cessna 421Bs. Its Mode-S transponder broadcasts the ICAO 24-bit address A4FFAB. It is one of 225 Cessna 421B aircraft on the FAA registry. Registration Pending holds 2,403 aircraft on the registry.

Registered owner

Registration Pending

Owner type

Individual

Based in

Sonoma, CA

Serial number

421B0825

Year built

1974 · 52 yrs old

Airworthiness class

Standard – Normal

FAA status

Revoked

Mode-S / ICAO24

A4FFAB · 51177653 octal

Airworthiness date

Nov 8, 1974

Last FAA activity

Sep 9, 2026

FAA region

4

Source: FAA aircraft registry (public record). Community reviews and photos below.

Engine on this aircraft

Engine

Cont Motor GTSIO-520-C

Engine type

Reciprocating (Piston)

Rated power

340 hp × 2 (680 hp total)

Power per seat

85 hp

FAA engine code

17035

134 of the 214 registered Cessna 421B carry this engine (63%), across 13 engine variants on the type.

Source: FAA engine reference (ENGINE.txt), matched on this registration's engine code.

Runway requirement (estimate)

A Cessna 421B needs roughly 4,500 ft of runway for takeoff at sea level (takeoff distance ~3,900 ft plus a 15% safety margin). Check it against a destination airport →

Planning estimate for takeoff only — excludes landing distance, wind, density altitude, and contamination. Verify against the aircraft's POH/AFM.

Community facts about N421DK

Reported by pilots, owners and enthusiasts — community-reported and admin-checked before they publish. Always verify anything important against the aircraft's records.