| Tail Number / N-Number | N331EX |
| Manufacturer | SIEVILA LOREN G |
| Model | ONEX |
| Year Built | 2014 |
| Manufacturer's Serial Number | ONX0033 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 1 seat |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | AEROCONVER |
| Engine Model | AEROVEE |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 80 hp (60 kW) |
| Kit Manufacturer | SONEX AIRCRAFT LLC |
| Kit Model | ONEX |
| Type of Registrant | Individual |
| Owner Name | SIEVILA LOREN G |
| Street | N 8506 EAST END RD |
| City | IRONWOOD |
| State | MI |
| Zip Code | 49938 |
| Region | Great Lakes |
| County | Gogebic County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2014-05-10 |
| Certificate Issue Date | 2013-02-08 |
| Last Action Date | 2021-11-01 |
| Expiration Date | 2029-02-28 |
| Status | Valid Registration |
| Mode S Code | 50715000 |
| Mode S Code Hex | A39A00 |