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Helio H-391B

16 registered with the FAA, built 1954 to 1958.

Type: Fixed-wing, single engine
Engines: 1 × Piston
Seats: 4
Weight class: Up to 12,499 lb

All states 16 Michigan 4 Alaska 3 Washington 3 California 2 Vermont 2 Colorado 1 Florida 1

N4120D 1957 Helio H-391BClark Kyle B Underhill, VT Registered
N242B 1954 Helio H-391BClark Kyle B Underhill, VT Registered

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An independent site built from the Federal Aviation Administration's public aircraft registry, updated nightly by the FAA. Not affiliated with the FAA. Records can lag the official registry; the FAA's own records are authoritative. For people registered as individuals, we show the city and state but not the street address.

Data last updated Nov 2, 2026. © 2026 MMR Internet, LLC.