| Tail Number / N-Number | N25531 |
| Manufacturer | REARWIN |
| Model | 8135 |
| Year Built | 1940 |
| Manufacturer's Serial Number | 818 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | KEN ROYCE |
| Engine Model | 7 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 120 hp (90 kW) |
| Average Cruising Speed | 95 miles per hour |
| Type of Registrant | Individual |
| Owner Name | MERTESDORF JOHN |
| Street | 46386 471ST LN |
| City | NICOLLET |
| State | MN |
| Zip Code | 56074-4047 |
| Region | Great Lakes |
| County | Nicollet County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1955-10-30 |
| Certificate Issue Date | 2003-01-29 |
| Last Action Date | 2021-11-09 |
| Expiration Date | 2029-04-30 |
| Status | Valid Registration |
| Mode S Code | 50466354 |
| Mode S Code Hex | A26CEC |