Skip to content
KnownTail
Aircraft record

N66NC1978 Cessna 421C

DeregisteredUnclaimedSource: FAA, updated Oct 20, 2026

This N-number isn't registered right now. Below is its last known registration, canceled Dec 26, 2023.

Safety record in brief:1 NTSB accident (substantial damage, Jul 2021)5 ADs may apply1 service difficulty report

Registration
Deregistered
Last based in
Greeley, CO
owner city / state
Engine
GTSIO-520 SER · 435 hp
Cont Motor
Owners
1
on record
NTSB events
1
substantial, 2021
ADs may apply
5
confirm with A&P
Service reports
1
since 1995

Registration

FAA Aircraft Registry · Oct 20, 2026
Last registered owner
Individual owner
City, state
Greeley, CO
Canceled
Dec 26, 2023
Airworthiness
Standard · Normal
Airworthiness date
Mar 19, 1981

We never show street addresses, even though they appear in the public FAA file. Individual owners are shown by city and state only.

Airframe & engine

FAA Registry + type data

Airframe

Manufacturer
Cessna
Model
421C
Year
1978
Serial number
421C0519
Aircraft type
Fixed wing multi engine
Category
Land
Certification
Type Certificated
Seats
8
Engines
2
Max takeoff weight
Up to 12,499 lb
Mode S code
A8B30F

Engine

Make and model
Cont Motor Gtsio-520 Ser
Type
Reciprocating
Power
435 hp

Total time and engine hours aren't public. They appear here once the owner adds logbooks.

Ownership history

Ownership history from FAA records
  1. until 2023Individual ownerGreeley, CO

Individual owners are shown by city and state only.

Safety record

NTSB · Oct 15, 2026 · FAA ADs · Oct 20, 2026 · SDRs · Oct 16, 2026

NTSB events (1)

Accident · substantial damage

Jul 10, 2021 · Longmont, CO

The loss of performance for reasons that could not be determined.

Damage
Substantial
Injuries
Minor
Report
CEN21LA315

From NTSB records; matched by serial number.Read NTSB report (search CAROL for CEN21LA315)

Accident history for this model

ADs published since 1998 that may apply (5)

These match the airframe or engine model. Whether each one applies, and whether it's been complied with, depends on serial numbers, equipment and logbook entries. Applicability must be confirmed by a mechanic against the aircraft's records.

ADSubjectEffectiveApplies to
2016-17-08Elevator Tab Control SystemSep 12, 2016Airframe (421C)
2007-05-15Teledyne Continental Motors GTSIO-520 Series Reciprocating EnginesApr 16, 2007Engine (GTSIO-520 SER)
2005-20-25The Cessna Aircraft Company Models 401, 401A, 401B, 402, 402A, 402B, 402C, 404, 411…Nov 9, 2005Airframe (421C)Certain serial numbers: 401 655; 401 401-0001–401-0322; 401A 655; 401A 401A0001–401A0132; 401B 401B0001–401B0221; 402 402-0001–402-0322; …. Only with: Equipped with an avionics bus circuit breaker switch P/N CM3589-50, 593-250-101, 593-250-102, W31-X2M5A-50, or W31-X1000-50.
2000-01-16Cessna Aircraft Company 300 and 400 Series AirplanesFeb 15, 2000Airframe (421C)
98-04-28Cessna Aircraft Company Models T303, 310R, T310R, 335, 340A, 402B, 402C, 404, F406, 414…Mar 13, 1998Airframe (421C)

AI-extracted — verify against original. Matched from each AD's applicability section; ADs replaced by a later AD are left out.

Service Difficulty Reports (1)

Reports of failures and defects that operators and repair stations sent to the FAA since 1995. A report describes one finding; it is not an accident.

  • Engine oil · oil cooler · leakingOct 30, 1998

    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 AND 3 RECENTLY OVERHAULED COOLERS INSTALLED. ALL LEAKED. INSPECTION OF OIL COOLER MATING SURFACE SHOWED ALL 4 COOLERS TO BE MACHINED…

    From FAA Service Difficulty Reports; matched by N-number and serial number.

Sources

  • FAA Aircraft RegistryRegistration, owner city and state, airframe, engineupdated Oct 20, 2026
  • NTSB accident and incident databaseAccidents and incidents since 1982updated Oct 15, 2026
  • FAA Airworthiness Directives (Federal Register)ADs published since 1998updated Oct 20, 2026
  • FAA Service Difficulty ReportsReports since 1995updated Oct 16, 2026

Request owner name removalReport an error in this record