| Tail Number / N-Number | N66DK |
| Manufacturer | KOSTER DOUGLAS D |
| Model | COZY MARK IV |
| Year Built | 1994 |
| Manufacturer's Serial Number | 23 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 4 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | LYCOMING |
| Engine Model | I0360 SER A&C |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 200 hp (149 kW) |
| Type of Registrant | Individual |
| Owner Name | KOSTER DOUGLAS D |
| Street | 2275 FOX VALLEY CT |
| City | AURORA |
| State | IL |
| Zip Code | 60504 |
| Region | Great Lakes |
| County | Kane County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1994-07-20 |
| Certificate Issue Date | 1994-05-16 |
| Last Action Date | 2022-11-18 |
| Expiration Date | 2030-04-30 |
| Status | Valid Registration |
| Mode S Code | 52131065 |
| Mode S Code Hex | A8B235 |