# N252LG: 1973 Hiller OH-23C

- Status: Valid registration
- Airframe: [Hiller OH-23C](https://openairdocs.org/model/hiller-oh-23c) (registry code 4360119, 4 seats)
- Engine: [Franklin 6V-335 series](https://openairdocs.org/engine/franklin-6v-335-series) (registry code 27039)
- Data sheets: [TCDS 6H2](https://openairdocs.org/tcds/6H2) (Siam Hiller Holdings Inc.), [TCDS E-244](https://openairdocs.org/tcds/E-244) (Franklin Sp. z.o.o.) (OpenAirDocs)
- Serial number: 55-4096
- Year built: 1973
- Type: Rotorcraft
- Engine type: Reciprocating
- Airworthiness: Standard, normal
- Airworthiness date: September 29, 1993
- Certificate issued: May 25, 2021
- Expires: May 31, 2028
- Mode S code: A25FED
- Registered owner: [Alaska Army Aviation Museum Inc](https://openairdocs.org/faa-owner/ALASKA%20ARMY%20AVIATION%20MUSEUM%20INC)
- Location: [Big Lake, AK](https://openairdocs.org/faa-place/AK/Big%20Lake)
- Owner type: Corporation
- Owner's area on the map: 61.5160° N, 149.9712° W: Placed by OpenAirDocs at the center of ZIP code 99652, within about 6 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=252LG
- Page: https://openairdocs.org/aircraft/N252LG

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 6V-335 model are included.

## ADs that may apply (OpenAirDocs): 0 in force

### Matched by airframe (Hiller OH-23C)

None in force.

### Matched by engine (Franklin 6V-335 series)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N252LG.

## FAA accident and incident reports

None matched to N252LG.

## 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) (5)

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 6V-335 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 6V-335-A
- [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 6V-335-A
- [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 6V-335-A
- [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 6V-335-A
- [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 6V-335-A

## Related

- Other Hiller OH-23C aircraft: https://openairdocs.org/model/hiller-oh-23c/aircraft.md
- The Franklin 6V-335 series engine: https://openairdocs.org/engine/franklin-6v-335-series.md

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