- Registered owner
- Registration Pending
- Location
- Weirsdale, FL
- Owner type
- Individual
- Serial number
- 041
- Year built
- 1957
- Type
- Fixed wing single engine
- Engine
- Reciprocating
- Airworthiness
- Standard
- Airworthiness date
- January 4, 1957
- Mode S code
- A4DE0D
- Registry status
- Registration pending
From the FAA registry file of October 24, 2026. The registry lists only the engine series, so ADs for every Lycoming GO-435C&D model are included below.
On this page
Airworthiness directives that may apply · 11
Matched by this aircraft’s airframe and engine models. Each AD’s applicability may narrow it by serial number, part number or equipment.
| 1963 | 1 |
|---|---|
| 1979 | 1 |
| 1982 | 1 |
| 2005 | 1 |
| 2022 | 1 |
Airframe · Helio H-391B
AD 2022-03-15Fuel Quantity IndicatorAD 2005-01-19Mode S transpondersAD 82-16-08Left and Right Main Spar Carry-Thru AssemblyAD 79-07-02BatteriesAD 63-18-02Engine BreatherAD 59-17-06Pulley GuardsAD 59-17-05Horizontal Tail Spar FittingAD 58-25-04Fin Hinge AttachmentAD 58-01-04Aileron Bellcrank InspectionAD 57-25-02Fin Spar InspectionAD 56-22-02Wing Attachment WashersInformation bulletins that may apply · 3
Advisory, not mandatory.
NTSB investigations
No NTSB investigations matched to N4121DMatched by N-number and event date, checked against the reported serial number, make and model. Investigations from before this aircraft carried the mark are under Earlier aircraft. Investigations on Helio H-391B aircraft
FAA incident reports
No FAA accident or incident reports matched to N4121DMatched by N-number and event date, checked against the reported make and model. Reports from before this aircraft carried the mark are under Earlier aircraft. Reports on Helio H-391B aircraft
Service difficulty reports
No reports matched to N4121DGeneral aviation reporting is voluntary. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. Reports on Helio H-391B aircraft
STCs that may be installed · 126
Approved for this aircraft’s airframe or engine model. The registry doesn’t record which STCs an aircraft has; its records do.
Airframe · Helio H-391B
STC SA02571SEInstallation of Garmin G500/G600 TXi Integrated Avionics System (Primary Flight Display, Multi-Function Display, and Engine Indicating System Display).STC SA01800SEFabrication and installation of new or replacement of existing instrument panel lights dimmer control.STC SA01861SEFabrication and installation of Landing Light Controller