# N57893: 1955 Hiller OH-23B

- Status: Valid registration
- Airframe: [Hiller OH-23B](https://openairdocs.org/model/hiller-oh-23b) (registry code 4360109, 4 seats)
- Engine: [Franklin 6VS-335 series](https://openairdocs.org/engine/franklin-6vs-335-series) (registry code 27040)
- Data sheets: [TCDS 6H2](https://openairdocs.org/tcds/6H2) (Siam Hiller Holdings Inc.), [TCDS 1E2](https://openairdocs.org/tcds/1E2) (Franklin Sp. z.o.o.) (OpenAirDocs)
- Serial number: 715
- Year built: 1955
- Type: Rotorcraft
- Engine type: Reciprocating
- Airworthiness: Standard, normal
- Airworthiness date: September 1, 1987
- Certificate issued: August 16, 2011
- Expires: August 31, 2027
- Mode S code: A76FD0
- Registered owner: [Loudon Ross W Trustee](https://openairdocs.org/faa-owner/LOUDON%20ROSS%20W%20TRUSTEE)
- Location: [Reno, NV](https://openairdocs.org/faa-place/NV/Reno)
- Owner type: Individual
- Owner's area on the map: 39.4973° N, 119.8269° W: Placed by OpenAirDocs at the center of ZIP code 89509, within about 2 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=57893
- Page: https://openairdocs.org/aircraft/N57893

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 6VS-335 model are included.

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

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

None in force.

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

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N57893.

## 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.

- [Incident 19900606018939I](https://openairdocs.org/incident/19900606018939I), Jun 6, 1990: Hiller H23B (N57893), East Wenatchee, WA, Minor damage. Helicopter being used to dry cherries in orchard. Pilot allowed RPM to decay. Rotor blades struck cherry trees.

## 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) (6)

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 6VS-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 6VS-335-A1A
- [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 6VS-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 6VS-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 6VS-335-A1A
- [STC SE8776SW](https://openairdocs.org/stc/SE8776SW): Installation of coated cylinders and piston rings. Continental Motors, Inc. Lists 6VS-335-A
- [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 6VS-335-A

## Related

- Other Hiller OH-23B aircraft: https://openairdocs.org/model/hiller-oh-23b/aircraft.md
- The Franklin 6VS-335 series engine: https://openairdocs.org/engine/franklin-6vs-335-series.md

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