# N46SP: 1968 Hughes OH-6A

- Status: Valid registration
- Airframe: [Hughes OH-6A](https://openairdocs.org/model/hughes-oh-6a) (registry code 4470905, 4 seats)
- Engine: [Allison 250-C10D](https://openairdocs.org/engine/allison-250-c10d) (registry code 03035)
- Data sheets: [TCDS H3WE](https://openairdocs.org/tcds/H3WE) (MD Helicopters LLC), [TCDS E4CE](https://openairdocs.org/tcds/E4CE) (Rolls-Royce Corporation) (OpenAirDocs)
- Serial number: 1280950
- Year built: 1968
- Type: Rotorcraft
- Engine type: Turbo-shaft
- Airworthiness: Standard, normal
- Airworthiness date: December 11, 2001
- Certificate issued: July 27, 1994
- Expires: November 30, 2027
- Mode S code: A598E0
- Registered owner: [Kentucky State Police](https://openairdocs.org/faa-owner/KENTUCKY%20STATE%20POLICE)
- Location: [Frankfort, KY](https://openairdocs.org/faa-place/KY/Frankfort)
- Owner type: Government
- Owner's area on the map: 38.2349° N, 84.8688° W: Placed by OpenAirDocs at the center of ZIP code 40601, within about 8 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=46SP
- Page: https://openairdocs.org/aircraft/N46SP

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.

## ADs that may apply (OpenAirDocs): 5 in force

### Matched by airframe (Hughes OH-6A)

None in force.

### Matched by engine (Allison 250-C10D)

- [AD 2006-16-04](https://openairdocs.org/ad/2006-16-04): Inspection of the fuel nozzle screen · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 43 more. Effective Sep 7, 2006
- [AD 82-24-05](https://openairdocs.org/ad/82-24-05): Control Assembly and Power Turbine Governor Assembly · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 43 more. Effective Nov 26, 1982
- [AD 72-03-06](https://openairdocs.org/ad/72-03-06): Turbine Wheels · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 9 more. Effective Feb 8, 1972
- [AD 69-18-04](https://openairdocs.org/ad/69-18-04): Torquemeter Shaftgear · Rolls-Royce 250-C10 (T63-A-5), 250-C10B (T63-A-5A), 250-C10D (T63-A-700) and 4 more. Effective Oct 18, 1969
- [AD 69-18-02](https://openairdocs.org/ad/69-18-02): Internal Splines · Rolls-Royce 250-C10 (T63-A-5), 250-C10B (T63-A-5A), 250-C10D (T63-A-700) and 4 more. Effective Sep 3, 1969

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N46SP.

## FAA accident and incident reports

None matched to N46SP.

## 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) (2)

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 (Allison 250-C10D)

- [STC SE00027EN](https://openairdocs.org/stc/SE00027EN): Installation of Pratt & Whitney Engine Services Inc. Intellistart plus electronic control unit (ECU), P/N DPU-K-010 on the specified 250 engine models. Pratt & Whitney Engine Services Inc
- [STC ST00037AT](https://openairdocs.org/stc/ST00037AT): Unison igniter plugs, P/N 9044400-1. Unison Industries

## Earlier aircraft with N46SP

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N46SP before.

- [Cancelled 1990-05-01](https://openairdocs.org/deregistered/N46SP-1990-05-01): Skypower GBN-41-1000, S/N 114. Triennial form not returned

## Related

- Other Hughes OH-6A aircraft: https://openairdocs.org/model/hughes-oh-6a/aircraft.md
- The Allison 250-C10D engine: https://openairdocs.org/engine/allison-250-c10d.md

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