# N491AK: 1997 Short Bros C-23B SHERPA

- Status: Valid registration
- Airframe: [Short Bros C-23B SHERPA](https://openairdocs.org/model/short-bros-c-23b-sherpa) (registry code 8110608, 30 seats)
- Engine: [Pratt & Whitney Canada PT6A-65AR](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-65ar) (registry code 52277)
- Data sheets: [TCDS E4EA](https://openairdocs.org/tcds/E4EA) (Pratt & Whitney Canada Corp.) (OpenAirDocs)
- Serial number: SH3416
- Year built: 1997
- Type: Fixed wing multi engine
- Engine type: Turbo-prop
- Airworthiness: Standard, transport
- Airworthiness date: September 15, 2015
- Certificate issued: August 5, 2022
- Expires: August 31, 2029
- Mode S code: A613D9
- Registered owner: [Win Win Aviation Inc](https://openairdocs.org/faa-owner/WIN%20WIN%20AVIATION%20INC)
- Location: [Wake Forest, NC](https://openairdocs.org/faa-place/NC/Wake%20Forest)
- Owner type: Corporation
- Owner's area on the map: 35.9813° N, 78.5499° W: Placed by OpenAirDocs at the center of ZIP code 27587, 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=491AK
- Page: https://openairdocs.org/aircraft/N491AK

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): 1 in force

### Matched by airframe (Short Bros C-23B SHERPA)

None in force.

### Matched by engine (Pratt & Whitney Canada PT6A-65AR)

- [AD 97-04-12](https://openairdocs.org/ad/97-04-12): Compressor Bleed-off Valve · Pratt & Whitney Canada PT6A-11, PT6A-110, PT6A-112 and 52 more. Effective Mar 14, 1997

## Information bulletins (advisory) (2 in force)

- [SAIB NE-15-21](https://openairdocs.org/saib/NE-15-21): Fuel Injector Nozzle. Issued Aug 19, 2015
- [SAIB CE-03-24](https://openairdocs.org/saib/CE-03-24): . Issued Feb 19, 2003

## NTSB investigations

None matched to N491AK.

## FAA accident and incident reports

None matched to N491AK.

## 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 (Pratt & Whitney Canada PT6A-65AR)

- [STC SE00014EN](https://openairdocs.org/stc/SE00014EN): Installation of the Pratt & Whitney Engine Services, Inc. CrossCheck Engine Monitor Kit P/N HUMS-K-071-1, Rev. A on the specified PT6A engine models and kit P/N HUMS-K-071-2 on the specified A250 engine models. Pratt & Whitney Engine Services Inc
- [STC SE00020EN](https://openairdocs.org/stc/SE00020EN): Installation of the Pratt & Whitney Engine Services, Inc. TrendCheck/ TrendCheck Plus Engine Monitor Kit P/N TREND-K-010-1. Pratt & Whitney Engine Services Inc
- [STC SE8652SW](https://openairdocs.org/stc/SE8652SW): Installation of a flexible hose from the Propeller Primary Governor to the Fuel Control Unit. Air Tractor Inc
- [STC SE01805NY](https://openairdocs.org/stc/SE01805NY): Installation of Fuel Nozzle Adapters using studs and nuts. Atlantic Turbines International Inc
- [STC SE09257SC](https://openairdocs.org/stc/SE09257SC): Convert P&W Engine Models PT6A-15AG, -27, and -28, into PT6A-34 configuration. Covington Aircraft Engines, Inc
- [STC SE659NE](https://openairdocs.org/stc/SE659NE): Installation of oil tank filler neck check valve, P/N TSA-76A. Aviation Components Support

## Related

- Other Short Bros C-23B SHERPA aircraft: https://openairdocs.org/model/short-bros-c-23b-sherpa/aircraft.md
- The Pratt & Whitney Canada PT6A-65AR engine: https://openairdocs.org/engine/pratt-whitney-canada-pt6a-65ar.md

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