# N66NC: 1978 Cessna 421C, registration cancelled 2023-12-26

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: December 26, 2023
- Status when cancelled: Sale reported, canceled
- Airframe: [Cessna 421C](https://openairdocs.org/model/cessna-421c) (registry code 2076016)
- Engine: [Continental GTSIO-520 series](https://openairdocs.org/engine/continental-gtsio-520-series) (registry code 17039)
- Data sheets: [TCDS A7CE](https://openairdocs.org/tcds/A7CE), [TCDS E7CE](https://openairdocs.org/tcds/E7CE) (OpenAirDocs)
- Serial number: 421C0519
- Year built: 1978
- Type of aircraft: Fixed wing multi engine
- Engine type: Turbo-prop
- Airworthiness: Standard, normal
- Airworthiness date: March 19, 1981
- Last registry action: March 25, 2023
- Mode S code: A8B30F
- Location: [Greeley, CO](https://openairdocs.org/faa-place/CO/Greeley)
- Owner type: Individual
- Owner's area on the map: 40.4447° N, 104.6794° W: Placed by OpenAirDocs at the center of ZIP code 80631, within about 6 miles (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N66NC
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=66NC
- Page: https://openairdocs.org/deregistered/N66NC-2023-12-26

From the FAA registry file of November 5, 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 Cessna 421C: https://openairdocs.org/model/cessna-421c.md

## Service difficulty reports (1)

Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

- [SDR 98ZZZX4240](https://openairdocs.org/sdr/98ZZZX4240), Oct 30, 1998: OIL COOLER. LEAKING. OIL LEAK NOTED BELOW THE OIL COOLER ON A RECENTLY OVERHAULED ENGINE. OIL COOLER WAS PULLED AND GASKETS REPLACED. ENGINE STILL LEAKED OIL. OIL COOLER WAS PULLED 

## 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 CEN21LA315](https://openairdocs.org/ntsb/CEN21LA315), Jul 10, 2021: Cessna 421C (N66NC), Longmont, CO, substantial damage. Probable cause: The loss of performance for reasons that could not be determined.

## 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 20210710010559A](https://openairdocs.org/incident/20210710010559A), Jul 10, 2021: Cessna 421C (N66NC), Longmont, CO, Substantial damage. According to the PIC, the aircraft loaded 3 passengers and luggage. The fuel on board was 100 gallons. Aircraft was 900 pounds below mgw. N66NC taxied for…

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