# N6638P: 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: 67-16333
- Type: Rotorcraft
- Engine type: Turbo-shaft
- Certificate issued: June 15, 2011
- Expires: June 30, 2027
- Mode S code: A8C2DC
- 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=6638P
- Page: https://openairdocs.org/aircraft/N6638P

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 FTW97TA162](https://openairdocs.org/ntsb/FTW97TA162), Apr 15, 1997: Hughes OH-6A (N6638P), Marfa, TX, substantial damage. Probable cause: the pilot's improper touchdown, and the designated examiner's inadequate supervision. The light condition at dusk was a related factor.

## 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.

- [Accident 19970414037699A](https://openairdocs.org/incident/19970414037699A), Apr 14, 1997: Hughes OH6A (N6638P), Marfa, TX, Substantial damage. Night practice autorotation. Night recurrent training. Rocked back on skids. Student used aft cyclic. Chopped tail.

## 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 N6638P

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N6638P before.

- [Cancelled 1983-05-10](https://openairdocs.org/deregistered/N6638P-1983-05-10): Piper PA-24-250, S/N 24-1760. Exported to Canada. Owner: [Vks Aircraft Corp](https://openairdocs.org/faa-owner/VKS%20AIRCRAFT%20CORP), [Laramie, WY](https://openairdocs.org/faa-place/WY/Laramie)

## Related

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

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