# N6NW: 1986 Williamson/Williamson RV-4, registration cancelled 2013-04-09

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: April 9, 2013
- Status when cancelled: Registration expired, pending cancellation
- Airframe: [Williamson/Williamson RV-4](https://openairdocs.org/model/williamson-williamson-rv-4) (registry code 056139U)
- Engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508)
- Data sheets: [TCDS E-274](https://openairdocs.org/tcds/E-274) (OpenAirDocs)
- Serial number: 1
- Year built: 1986
- Type of aircraft: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Experimental, amateur built
- Airworthiness date: January 6, 1986
- Certificate issued: August 31, 1983
- Last registry action: August 21, 2007
- Mode S code: A7C3CE
- Owners when cancelled: [Williamson Boyd D](https://openairdocs.org/faa-owner/WILLIAMSON%20BOYD%20D), [Williamson Norah D](https://openairdocs.org/faa-owner/WILLIAMSON%20NORAH%20D)
- Location: [North Bend, OR](https://openairdocs.org/faa-place/OR/North%20Bend)
- Owner type: Co-owned
- Owner's area on the map: 43.4842° N, 124.1827° W: Placed by OpenAirDocs at the center of ZIP code 97459, within about 6 miles (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N6NW
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=6NW
- Page: https://openairdocs.org/deregistered/N6NW-2013-04-09

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 Williamson/Williamson RV-4: https://openairdocs.org/model/williamson-williamson-rv-4.md

## 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 SEA99LA108](https://openairdocs.org/ntsb/SEA99LA108), Jul 7, 1999: Williamson/Williamson RV-4 (N6NW), Coos Bay, OR, substantial damage. Probable cause: Inadequate aircraft preflight inspection (engine air inlet cover not removed) by the pilot, resulting in obstruction of the carburetor air inlet in flight and consequent inflight engine stoppage.…

## 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 19990707008459A](https://openairdocs.org/incident/19990707008459A), Jul 7, 1999: Amtr RV4 (N6NW), North Bend, OR, Substantial damage. Acft lost power on take-off and crashed, other circumstances are unknown. (.19) on July 7, 1999, approximately 1600 pacific daylight time, a…

---
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.