# N6640Z: Hughes OH-6A

- Status: Valid registration
- Airframe: [Hughes OH-6A](https://openairdocs.org/model/hughes-oh-6a) (registry code 4470905, 4 seats)
- Data sheets: [TCDS H3WE](https://openairdocs.org/tcds/H3WE) (MD Helicopters LLC) (OpenAirDocs)
- Serial number: 66-16076
- Type: Rotorcraft
- Engine type: Turbo-shaft
- Certificate issued: June 14, 2011
- Expires: June 30, 2027
- Mode S code: A8C585
- Registered owner: [Usda Aphis Ws Atoc](https://openairdocs.org/faa-owner/USDA%20APHIS%20WS%20ATOC)
- Location: [Cedar City, UT](https://openairdocs.org/faa-place/UT/Cedar%20City)
- Owner type: Government
- Owner's area on the map: 37.7687° N, 113.1336° W: Placed by OpenAirDocs at the center of ZIP code 84721, 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=6640Z
- Page: https://openairdocs.org/aircraft/N6640Z

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): 0 in force

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

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB GAA17CA135](https://openairdocs.org/ntsb/GAA17CA135), Feb 8, 2017: Hughes OH 6A (N6640Z), Price, UT, substantial damage. Probable cause: The fuel truck driver’s failure to stop before impacting the helicopter’s main rotor blades.

## FAA accident and incident reports

None matched to N6640Z.

## 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)

None matched to this aircraft's models.

## Earlier aircraft with N6640Z

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N6640Z before.

- [Cancelled 1990-01-29](https://openairdocs.org/deregistered/N6640Z-1990-01-29): Piper PA-25-235, S/N 252235. N-number assigned, not yet registered

## Related

- Other Hughes OH-6A aircraft: https://openairdocs.org/model/hughes-oh-6a/aircraft.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.