# N671: 2005 Central Copters LANCAIR IV-P, registration cancelled 2011-05-17

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: May 17, 2011
- Status when cancelled: Triennial form not returned
- Airframe: [Central Copters LANCAIR IV-P](https://openairdocs.org/model/central-copters-lancair-iv-p) (registry code 0561756)
- Engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999)
- Serial number: LIV423
- Year built: 2005
- Type of aircraft: Fixed wing single engine
- Kit: Lancair Intl Inc LANCAIR IV P
- Airworthiness: Experimental, amateur built
- Airworthiness date: November 2, 2005
- Certificate issued: October 13, 2004
- Last registry action: November 18, 2008
- Mode S code: A8DF6E
- Owner when cancelled: [Duffy Mark](https://openairdocs.org/faa-owner/DUFFY%20MARK)
- Location: [Bozeman, MT](https://openairdocs.org/faa-place/MT/Bozeman)
- Owner type: Individual
- Owner's area on the map: 45.6839° N, 111.0576° W: Placed by OpenAirDocs: center of Bozeman, MT, within about 3 miles (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N671
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=671
- Page: https://openairdocs.org/deregistered/N671-2011-05-17

From the FAA registry file of October 28, 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 Central Copters LANCAIR IV-P: https://openairdocs.org/model/central-copters-lancair-iv-p.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 SEA06LA074](https://openairdocs.org/ntsb/SEA06LA074), Apr 15, 2006: Central Copters Lancair IV-P (N671), Belgrade, MT, destroyed. Probable cause: The total loss of drive power to the aircraft's propeller while on a visual final approach, due to the decoupling of the quill shaft between the reduction gearbox and the engine power section.…

## 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 20060414004599A](https://openairdocs.org/incident/20060414004599A), Apr 14, 2006: Amtr LANCAIRIVP (N671), Bozeman, MT, Destroyed. (-23) Loss of power. Possible safety recommendation based on engine-teardown results.

## Other aircraft with N671

- [Registered now](https://openairdocs.org/aircraft/N671): Central Copters LANCAIR IV-P PROPJET, S/N L4-596, built 2012
- [Cancelled 1929-01-30](https://openairdocs.org/deregistered/N671-1929-01-30): Travel Air Mfg 2000, S/N 192, built 1927. Owner: [Greunke Karl A](https://openairdocs.org/faa-owner/GREUNKE%20KARL%20A), [Appleton, WI](https://openairdocs.org/faa-place/WI/Appleton)

---
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.