Cessna 421B Aircraft under $500,000

The Cessna 421B Golden Eagle is a variant of the 421 pressurised piston twin line — built in the early-to-mid 1970s, between the 421A and the later 421C that most buyers reference. It offers genuine cabin pressurisation in a piston twin, with tip-tank fuel (the wet-wing fuel system arrived later, on the 421C).

Engine: Two Continental GTSIO-520-H engines. The GTSIO (Geared, Turbo-Supercharged) is a complex, high-output piston — geared reduction adds a layer of maintenance not present in un-geared Continentals. Unlike the PT6A-powered Conquest I, the 421B has no turbine simplicity; engine condition and overhaul timing are the dominant pre-buy variable.

Versus the 421C: Most buyers default to the 421C for its later production, wet-wing fuel, landing-gear improvements, and wider pool of shop experience. At comparable prices, the 421C is generally preferred. The 421B is appropriate where a documented, well-maintained example is available at a meaningful discount.

Pressurisation: The 421B offers genuine cabin pressurisation — rare in piston-twin price brackets. Pressurisation seals, outflow valves, and the differential-pressure system require careful inspection; these components are expensive and often deferred on older aircraft.

Buy it if: you want pressurised piston-twin capability with a documented history, and your maintenance base has GTSIO-520 experience. Prioritise engine condition and hot-section status above all else at pre-buy; the GTSIO-520's overhaul cost is the dominant ownership risk.