| Tail Number / N-Number | N391BF |
| Manufacturer | FIELD BURTON M |
| Model | SONEX |
| Year Built | 2005 |
| Manufacturer's Serial Number | 0391 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | AMA/EXPR |
| Engine Model | UNKNOWN ENG |
| Number of Engines | 1 engine |
| Kit Manufacturer | SONEX LTD |
| Kit Model | SONEX |
| Type of Registrant | Individual |
| Owner Name | WIECHMAN BYRON T |
| Street | 513 S FLOYD ST |
| City | WICHITA |
| State | KS |
| Zip Code | 67209-1713 |
| Region | Central |
| County | Sedgwick County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2005-04-03 |
| Certificate Issue Date | 2023-01-03 |
| Last Action Date | 2023-01-03 |
| Expiration Date | 2030-01-31 |
| Status | Valid Registration |
| Mode S Code | 51103237 |
| Mode S Code Hex | A4869F |