| Tail Number / N-Number | N904BF |
| Manufacturer | RAMSDELL WILLIS |
| Model | RV4 |
| Manufacturer's Serial Number | 3630 |
| 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 | CONT MOTOR |
| Engine Model | IO-360-A |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 210 hp (157 kW) |
| Type of Registrant | LLC |
| Owner Name | GRANDBEAR AIR LLC |
| Street | 3662 QUAIL POINT RD |
| City | MOUNTAIN GREEN |
| State | UT |
| Zip Code | 84050-9349 |
| Region | Northwest Mountain |
| County | Morgan County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2008-05-23 |
| Certificate Issue Date | 2021-05-05 |
| Last Action Date | 2021-05-05 |
| Expiration Date | 2028-05-31 |
| Status | Valid Registration |
| Mode S Code | 53077047 |
| Mode S Code Hex | AC7E27 |