| Tail Number / N-Number | N1139Y |
| Manufacturer | MOONEY |
| Model | M20J |
| Year Built | 1981 |
| Manufacturer's Serial Number | 24-1154 |
| 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 A&C |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 200 hp (149 kW) |
| Average Cruising Speed | 126 miles per hour |
| Type of Registrant | Individual |
| Owner Name | ARMSTRONG WILLIAM R |
| Street | 15122 HONSENA DR |
| City | CENTREVILLE |
| State | VA |
| Zip Code | 20120-1418 |
| Region | Eastern |
| County | Fairfax County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1981-06-29 |
| Certificate Issue Date | 2001-02-20 |
| Last Action Date | 2022-12-26 |
| Expiration Date | 2030-01-31 |
| Status | Valid Registration |
| Mode S Code | 50035402 |
| Mode S Code Hex | A03B02 |