| Tail Number / N-Number | N25S |
| Manufacturer | SPRENGER MICHAEL T |
| Model | RV-4 |
| Year Built | 1992 |
| Manufacturer's Serial Number | 001 |
| 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 | 0-320 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Type of Registrant | Individual |
| Owner Name | SPRENGER MICHAEL T |
| Street | 21224 15TH AVE N |
| City | HAWLEY |
| State | MN |
| Zip Code | 56549-9075 |
| Region | Great Lakes |
| County | Clay County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1992-09-22 |
| Certificate Issue Date | 2015-03-19 |
| Last Action Date | 2020-10-19 |
| Expiration Date | 2028-03-31 |
| Status | Valid Registration |
| Mode S Code | 50453265 |
| Mode S Code Hex | A256B5 |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N25S.
| Tail Number / N-Number | N25S |
| Manufacturer | STINSON |
| Model | 108 |
| Year Built | 1946 |
| Manufacturer's Serial Number | 108-422 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 4 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 1 engine |
| Average Cruising Speed | 84 miles per hour |
| Type of Registrant | Individual |
| Owner Name | GEORGE H O |
| Street | 660 BRIGHTON ST |
| City | GRASS VALLEY |
| State | CA |
| Zip Code | 95945 |
| Region | Western-Pacific |
| County | Clay County |
| Certificate Issue Date | 1960-07-29 |
| Last Status | Valid Registration |
| Cancellation Date | 1970-04-08 |