# N3107G: 1959 Hiller H-23A

- Status: Valid registration
- Airframe: [Hiller H-23A](https://openairdocs.org/model/hiller-h-23a) (registry code 4360108, 4 seats)
- Engine: [Franklin 6A4200 series](https://openairdocs.org/engine/franklin-6a4200-series) (registry code 27027)
- Data sheets: [TCDS 6H1](https://openairdocs.org/tcds/6H1) (Siam Hiller Holdings Inc.), [TCDS E-238](https://openairdocs.org/tcds/E-238) (Franklin Sp. z.o.o.) (OpenAirDocs)
- Serial number: 236
- Year built: 1959
- Type: Rotorcraft
- Engine type: Reciprocating
- Airworthiness: Standard, normal
- Airworthiness date: March 11, 1963
- Mode S code: A34A25
- Registered owner: [Zaathof Aero LLC](https://openairdocs.org/faa-owner/ZAATHOF%20AERO%20LLC)
- Location: [Foristell, MO](https://openairdocs.org/faa-place/MO/Foristell)
- Owner type: LLC
- Owner's area on the map: 38.7872° N, 90.9440° W: Placed by OpenAirDocs at the center of ZIP code 63348, within about 4 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=3107G
- Page: https://openairdocs.org/aircraft/N3107G

From the FAA registry file of October 24, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination. The registry lists only the engine series, so ADs for every Franklin 6A4200 model are included.

## ADs that may apply (OpenAirDocs): 1 in force

### Matched by airframe (Hiller H-23A)

None in force.

### Matched by engine (Franklin 6A4200 series)

- [AD 69-09-01](https://openairdocs.org/ad/69-09-01): Eisemann Magnetos · Eisemann Magnetos, 2A4-45-B2, 2A4-49-B2 and 158 more

## Information bulletins (advisory)

None matched.

## NTSB investigations (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB LAX86LA065](https://openairdocs.org/ntsb/LAX86LA065), Dec 13, 1985: Hiller H-23A (N3107G), Madera, CA, destroyed

## FAA accident and incident reports (1)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Accident 19851213075619A](https://openairdocs.org/incident/19851213075619A), Dec 13, 1985: Hiller H23A (N3107G), Madera, CA, Destroyed. Impacted the ground during a frost control flight when fog suddenly rolled in, cutting the visibility to zero.

## Service difficulty reports

None filed for this aircraft. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

## STCs that may be installed (OpenAirDocs) (8)

Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do.

### Approved for the engine (Franklin 6A4200 series)

- [STC SE04651CH](https://openairdocs.org/stc/SE04651CH): To allow use of l00R grade aviation fuel meeting Swift Fuel, LLC specification SPEC-l00R-22. Swift Fuels LLC. Lists 6A4-200-C6
- [STC SE2932SW](https://openairdocs.org/stc/SE2932SW): Install carburetor air temperature indicator. Approved for Aircooled Motors (Franklin Engine Co.) equipped with float carburetors. Model eligibility included here may not be inclusive. Alcor LLC. Lists 6A4-200-C6
- [STC SE1311SO](https://openairdocs.org/stc/SE1311SO): Installation of Shivers carburetor temperature gauge with a Richter Aero Equipment B-5 carburetor temperature probe. LegacySTC.com. Lists 6A4-200-C6
- [STC SE03309CH](https://openairdocs.org/stc/SE03309CH): Installation of Engine Preheat Kit, p/n TSP6CYL-2927-115 for 115 volt application. Hartzell Propeller Inc. Lists 6A4-200-C6
- [STC SE01966WI](https://openairdocs.org/stc/SE01966WI): Use of GAMI G100UL High Octane Unleaded Avgas in spark ignition piston aircraft engines. General Aviation Modifications Inc. Lists 6A4-200-C6
- [STC SE3331NM](https://openairdocs.org/stc/SE3331NM): Lycoming valve cover gasket. Real Gaskets Tennessee. Lists 6A4-200-C6
- [STC SE1-201](https://openairdocs.org/stc/SE1-201): Installation of the Richter Aero Equipment Type B-4 or B-5 Temperature Probe. (O-360 SERIES (excl. A1C, C2B, C2D)). MidContinent Instru Co Inc. Lists 6A4-200-C6
- [STC SE4-1192](https://openairdocs.org/stc/SE4-1192): Adapter to permit Bendix Scintilla magneto installation, Type SF6LN-8, and modification of carburetor- manifold adapter box. Van De Water Devel Co. Lists 6A4-200-C6

## Related

- Other Hiller H-23A aircraft: https://openairdocs.org/model/hiller-h-23a/aircraft.md
- The Franklin 6A4200 series engine: https://openairdocs.org/engine/franklin-6a4200-series.md

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