# N6639R: Hughes OH-6A, registration cancelled 2021-08-07

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: August 7, 2021
- Status when cancelled: Valid registration
- Airframe: [Hughes OH-6A](https://openairdocs.org/model/hughes-oh-6a) (registry code 4470905)
- Data sheets: [TCDS H3WE](https://openairdocs.org/tcds/H3WE) (OpenAirDocs)
- Serial number: 66-07874
- Type of aircraft: Rotorcraft
- Certificate issued: June 14, 2011
- Last registry action: January 13, 2020
- Mode S code: A8C301
- Owner when cancelled: [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 was based
- The mark today: https://openairdocs.org/aircraft/N6639R
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=6639R
- Page: https://openairdocs.org/deregistered/N6639R-2021-08-07

From the FAA registry file of November 3, 2026, cancelled registrations. Owners' street addresses are left out. The Mode S code belongs to the N-number, not the airframe.

ADs and bulletins for the Hughes OH-6A: https://openairdocs.org/model/hughes-oh-6a.md

## NTSB investigations (2)

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 WPR21LA107](https://openairdocs.org/ntsb/WPR21LA107), Feb 5, 2021: Hughes OH-6A (N6639R), Horseshoe Bend, ID, substantial damage. Probable cause: A partial loss of engine power due to a leak in the fuel cell outlet valve.
- [NTSB LAX05TA008](https://openairdocs.org/ntsb/LAX05TA008), Oct 15, 2004: Hughes OH-6A (N6639R), Jacumba, CA, substantial damage. Probable cause: the pilot's failure to maintain adequate clearance from the mountainous terrain, which resulted in the helicopter's tail rotor blades impacting rocks. A factor in the accident was the pilot's…

## FAA accident and incident reports (2)

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 20210205001189A](https://openairdocs.org/incident/20210205001189A), Feb 5, 2021: Hughes OH-6A (N6639R), Horseshoe Bend, ID, Substantial damage. During a predator mitigation flight and while in a hover the pilot moved to line up a shot on a wolf and at very low airspeed and altitude the engine spooled…
- [Accident 20041015028309A](https://openairdocs.org/incident/20041015028309A), Oct 15, 2004: Hughes OH6A (N6639R), Jacumba, CA, Minor damage. (-23) On October 15, 2004, about 0115 PDT, a Hughes operated by us border patrol collided with the terrain while performing low altitude maneuvers. According…

## Other aircraft with N6639R

- [Cancelled 1989-09-11](https://openairdocs.org/deregistered/N6639R-1989-09-11): Beech A36, S/N E1534. Triennial form not returned
- [Cancelled 1971-03-23](https://openairdocs.org/deregistered/N6639R-1971-03-23): Beech C-45H, S/N 52-10635. Owner: [Consolidated Air Parts Co](https://openairdocs.org/faa-owner/CONSOLIDATED%20AIR%20PARTS%20CO), [N Hollywood, CA](https://openairdocs.org/faa-place/CA/N%20Hollywood)

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