| Tail Number / N-Number | N4125H |
| Manufacturer | MOONEY |
| Model | M20J |
| Year Built | 1979 |
| Manufacturer's Serial Number | 24-0771 |
| 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) |
| Engine Manufacturer | LYCOMING |
| Engine Model | I0360 SER |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Average Cruising Speed | 126 miles per hour |
| Type of Registrant | Individual |
| Owner Name | OSTERBECK JEFFREY A |
| Street | 2239 FENCELINE DR |
| City | JACKSON |
| State | WI |
| Zip Code | 53037-8930 |
| Region | Great Lakes |
| County | Washington County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1979-01-31 |
| Certificate Issue Date | 2005-12-07 |
| Last Action Date | 2021-10-13 |
| Expiration Date | 2029-03-31 |
| Status | Valid Registration |
| Mode S Code | 51157235 |
| Mode S Code Hex | A4DE9D |