Registry / Helio / H-391B / N4120D

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N4120D V

Helio H-391B · 1957 · Underhill, VT

This aircraft — FAA registration facts

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.

Registered owner
Clark Kyle B
Owner type
Individual
Based in
Underhill, VT
Serial number
044
Year built
1957 · 69 yrs old
Airworthiness class
6132
FAA status
V
Mode-S / ICAO24
A4DDEA · 51156752 octal
Certificate issued
Oct 19, 2022
Airworthiness date
Jun 7, 1957
Last FAA activity
Sep 9, 2023
Registration expires
Oct 31, 2029
FAA region
Western

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 N4120D

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Flight history & live tracking

ICAO24: a4ddea
No flight data on file yet for N4120D.
Queries adsb.lol — works only if N4120D is broadcasting ADS-B right now. Daily sweep at 04:43 MST · external trackers above for guaranteed live data.
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Aircraft Type — ACFTREF 4300106

Helio H-391B
Engines: 1
Type: piston
Seats: 4
Cruise: 102 KTAS
Category: Standard

Engine — CODE 41521

Manufacturer: Lycoming
Model: GO-435C&D SER
Type: Reciprocating (Piston)
Horsepower: 260 HP

FAA Registration Record

N-Number: N4120D
Serial Number: 044
Year Manufactured: 1957
ACFTREF Code: 4300106
Engine Code: 41521
Status: V (V)
Certification: 6132
Type Aircraft: Fixed Wing Single Engine (4)
Type Engine: Reciprocating (Piston) (1)
Source: master

Transponder / ADS-B

Mode S (octal): 51156752
ICAO 24-bit (hex): A4DDEA

Registrant

Clark Kyle B
Individual
View all 3 aircraft registered to this owner →
102 Irish Settlement Rd
Underhill, VT, 054899774
FAA Region: Western

Key Dates

Certificate Issued Oct 19, 2022
Airworthiness Jun 7, 1957
Expiration Oct 31, 2029
Last Activity Sep 9, 2023
Data as of Oct 5, 2026

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