| Tail Number / N-Number | N6661Z |
| Manufacturer | KRAMP EUGENE H |
| Model | RV-6 |
| Year Built | 1991 |
| Manufacturer's Serial Number | 20950 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 2 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 | WILLIAMS DAVID R |
| Street | 110 78TH AVE NW |
| City | HAVRE |
| State | MT |
| Zip Code | 59501-5626 |
| Region | Northwest Mountain |
| County | Hill County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1991-08-29 |
| Certificate Issue Date | 2019-03-29 |
| Last Action Date | 2022-05-10 |
| Expiration Date | 2029-03-31 |
| Status | Valid Registration |
| Mode S Code | 52146426 |
| Mode S Code Hex | A8CD16 |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N6661Z.
| Tail Number / N-Number | N6661Z |
| Manufacturer | PIPER |
| Model | PA-25-235 |
| Manufacturer's Serial Number | 252261 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 1 seat |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 1 engine |
| Average Cruising Speed | 93 miles per hour |
| County | Hill County |
| Last Status | The Triennial Aircraft Registration form was mailed and has not been returned by the Post Office |
| Cancellation Date | 1989-02-06 |