| Tail Number / N-Number | N21WD |
| Manufacturer | SMITH |
| Model | AEROSTAR 600 |
| Year Built | 1975 |
| Manufacturer's Serial Number | 60-0197-087 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 6 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | LYCOMING |
| Engine Model | TI0-540 SER |
| Engine Type | Turbo-prop |
| Number of Engines | 2 engines |
| Horsepower per Engine | 310 hp (231 kW) |
| Total Horsepower | 620 hp (463 kW) |
| Average Cruising Speed | 186 miles per hour |
| Type of Registrant | LLC |
| Owner Name | MULLENS AVIATION LLC |
| Street | 20580 GROVELINE CT |
| City | ESTERO |
| State | FL |
| Zip Code | 33928-3160 |
| Region | Southern |
| County | Lee County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1975-01-09 |
| Certificate Issue Date | 2015-09-04 |
| Last Action Date | 2021-04-25 |
| Expiration Date | 2028-09-30 |
| Status | Valid Registration |
| Mode S Code | 50334441 |
| Mode S Code Hex | A1B921 |