| Tail Number / N-Number | N331U |
| Manufacturer | ROCKWELL INTERNATIONAL |
| Model | S-2R |
| Year Built | 1975 |
| Manufacturer's Serial Number | 2136S |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 1 seat |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | GARRETT |
| Engine Model | TPE331-1 |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 665 hp (496 kW) |
| Average Cruising Speed | 82 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | MCMILLAN CUSTOM SERVICE INC |
| Street | PO BOX 96 |
| City | ULMER |
| State | SC |
| Zip Code | 29849-0096 |
| Region | Southern |
| County | Allendale County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Restricted |
| Airworthiness Date | 1995-04-03 |
| Certificate Issue Date | 2015-05-21 |
| Last Action Date | 2021-03-29 |
| Expiration Date | 2028-05-31 |
| Status | Valid Registration |
| Mode S Code | 50715510 |
| Mode S Code Hex | A39B48 |