N4121D Revoked

This aircraft — FAA registration facts

N4121D is a 1957 Helio H-391B (serial 041), registered to Registration Pending (individual) in Weirsdale, FL. Its FAA registration is recorded as revoked; the airworthiness certificate dates from January 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 A4DE0D. It is one of 16 Helio H-391B aircraft on the FAA registry. Registration Pending holds 2,475 aircraft on the registry.

Registered owner

Registration Pending

Owner type

Individual

Based in

Weirsdale, FL

Serial number

041

Year built

1957 · 69 yrs old

Airworthiness class

1

FAA status

Revoked

Mode-S / ICAO24

A4DE0D · 51157015 octal

Airworthiness date

Jan 4, 1957

Last FAA activity

Aug 8, 2026

FAA region

7

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

Engine on this aircraft

Engine

Lycoming GO-435C&D SER

Engine type

Reciprocating (Piston)

Rated power

260 hp

Power per seat

65 hp

FAA engine code

41521

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.

Community facts about N4121D

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