| Tail Number / N-Number | N139ST |
| Manufacturer | HEIZER J/QUICKSILVER |
| Model | SPRINT II |
| Year Built | 1999 |
| Manufacturer's Serial Number | 099 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Light Sport |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | ROTAX |
| Engine Model | 503 SERIES |
| Engine Type | 2 Cycle |
| Number of Engines | 1 engine |
| Horsepower | 52 hp (39 kW) |
| Type of Registrant | Individual |
| Owner Name | HEIZER JOHN JR |
| Street | PO BOX 1 |
| City | LOVELOCK |
| State | NV |
| Zip Code | 89419-0001 |
| Region | Western-Pacific |
| County | Pershing County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2008-01-29 |
| Certificate Issue Date | 2008-01-16 |
| Last Action Date | 2022-06-17 |
| Expiration Date | 2029-11-30 |
| Status | Valid Registration |
| Mode S Code | 50117102 |
| Mode S Code Hex | A09E42 |