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Helio H-391B · 1957 · Underhill, VT
N4120D is a 1957 Helio H-391B (serial 044), registered to Clark Kyle B (individual) in Underhill, VT. Its FAA registration is recorded as v and expires October 2029; the airworthiness certificate dates from June 1957 (69 years ago). It carries a Lycoming GO-435C&D SER engine rated at 260 hp, the engine on 57% of registered Helio H-391Bs. Its Mode-S transponder broadcasts the ICAO 24-bit address A4DDEA. It is one of 16 Helio H-391B aircraft on the FAA registry. Clark Kyle B holds 3 aircraft on the registry.
Source: FAA aircraft registry (public record). Community reviews and photos below.
8 of the 14 registered Helio H-391B carry this engine (57%), across 3 engine variants on the type.
Source: FAA engine reference (ENGINE.txt), matched on this registration's engine code.
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Calculate density altitude, takeoff roll, and climb performance for a Helio H-391B at any airport.
Airport Performance CalculatorPre-filled with H-391B performance data
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