| Tail Number / N-Number | N90PK |
| Manufacturer | WAHL ROBERT H |
| Model | S-51D |
| Year Built | 1999 |
| Manufacturer's Serial Number | 149 |
| 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 | WALTER |
| Engine Model | 601D |
| Engine Type | Turbo-prop |
| Number of Engines | 1 engine |
| Horsepower | 724 hp (540 kW) |
| Kit Manufacturer | STEWART 51 INC |
| Kit Model | S-51D |
| Type of Registrant | Individual |
| Owner Name | KEYES GEORGE W |
| Street | 20981 KIVA CIR |
| City | FLINT |
| State | TX |
| Zip Code | 75762-9270 |
| Region | Southwestern |
| County | Smith County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2000-08-29 |
| Certificate Issue Date | 2004-09-16 |
| Last Action Date | 2021-03-12 |
| Expiration Date | 2028-04-30 |
| Status | Valid Registration |
| Mode S Code | 53067042 |
| Mode S Code Hex | AC6E22 |