# N427HS: 1959 Bell 47D1G

- Status: Valid registration
- Airframe: [Bell 47D1G](https://openairdocs.org/model/bell-47d1g) (registry code 1180804, 3 seats)
- Engine: [Franklin 6V4 series](https://openairdocs.org/engine/franklin-6v4-series) (registry code 27033)
- Data sheets: [TCDS E-244](https://openairdocs.org/tcds/E-244) (Franklin Sp. z.o.o.) (OpenAirDocs)
- Serial number: 427
- Year built: 1959
- Type: Rotorcraft
- Engine type: Reciprocating
- Airworthiness: Multiple
- Airworthiness date: May 9, 1961
- Certificate issued: May 31, 2005
- Expires: August 31, 2027
- Mode S code: A51660
- Registered owner: [Taz Air Service Inc](https://openairdocs.org/faa-owner/TAZ%20AIR%20SERVICE%20INC)
- Location: [Middletown, DE](https://openairdocs.org/faa-place/DE/Middletown)
- Owner type: Corporation
- Owner's area on the map: 39.4944° N, 75.6775° W: Placed by OpenAirDocs at the center of ZIP code 19709, within about 5 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=427HS
- Page: https://openairdocs.org/aircraft/N427HS

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 6V4 model are included.

## ADs that may apply (OpenAirDocs): 2 in force

### Matched by airframe (Bell 47D1G)

None in force.

### Matched by engine (Franklin 6V4 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
- [AD 51-28-02](https://openairdocs.org/ad/51-28-02): Oil Pump Gears · Wytwornia Sprzetu Komunikacyjnego 6V4-178-B3, 6V4-178-B31, 6V4-178-B32 and 3 more

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N427HS.

## FAA accident and incident reports

None matched to N427HS.

## 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 6V4 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 6V4-200-C32
- [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 6V4-178-B3
- [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 6V4-178-B3
- [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 6V4-178-B3
- [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 6V4-178-B3
- [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 6V4-178-B3

## Related

- Other Bell 47D1G aircraft: https://openairdocs.org/model/bell-47d1g/aircraft.md
- The Franklin 6V4 series engine: https://openairdocs.org/engine/franklin-6v4-series.md

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.