| Tail Number / N-Number | N521EF |
| Manufacturer | CESSNA |
| Model | 140 |
| Year Built | 1947 |
| Manufacturer's Serial Number | 12257 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | CONT MOTOR |
| Engine Model | C85 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 85 hp (63 kW) |
| Average Cruising Speed | 105 miles per hour |
| Type of Registrant | LLC |
| Owner Name | CRISCO MILLWRIGHT SERVICES LLC |
| Street | 16192 COASTAL HWY |
| City | LEWES |
| State | DE |
| Zip Code | 19958-3608 |
| Region | Eastern |
| County | Sussex County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1956-06-23 |
| Certificate Issue Date | 2016-09-16 |
| Last Action Date | 2022-04-20 |
| Expiration Date | 2029-09-30 |
| Status | Valid Registration |
| Mode S Code | 51506417 |
| Mode S Code Hex | A68D0F |