| Tail Number / N-Number | N421SW |
| Manufacturer | BEECH |
| Model | E33A |
| Year Built | 1969 |
| Manufacturer's Serial Number | CE-256 |
| 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 | CONT MOTOR |
| Engine Model | IO 520 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 285 hp (213 kW) |
| Average Cruising Speed | 138 miles per hour |
| Type of Registrant | Individual |
| Owner Name | PROUTY ERIC A |
| Street | 910 RADCLIFFE DR |
| City | SAN JOSE |
| State | CA |
| Zip Code | 95117-2542 |
| Region | Western-Pacific |
| County | Santa Clara County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1969-01-31 |
| Certificate Issue Date | 2016-12-12 |
| Last Action Date | 2022-08-30 |
| Expiration Date | 2029-12-31 |
| Status | Valid Registration |
| Mode S Code | 51200373 |
| Mode S Code Hex | A500FB |