| Tail Number / N-Number | N921U |
| Manufacturer | ROBINSON HELICOPTER |
| Model | R22 BETA |
| Year Built | 2004 |
| Manufacturer's Serial Number | 3566 |
| Aircraft Type | Rotorcraft |
| 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 | LYCOMING |
| Engine Model | O-360 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Type of Registrant | Corporation |
| Owner Name | TUMBLEWEED LEASING CO INC |
| Street | 619 N 2360 W |
| City | SALT LAKE CITY |
| State | UT |
| Zip Code | 84116-2957 |
| Region | Northwest Mountain |
| County | Salt Lake County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2004-03-10 |
| Certificate Issue Date | 2007-03-29 |
| Last Action Date | 2022-11-26 |
| Expiration Date | 2030-03-31 |
| Status | Valid Registration |
| Mode S Code | 53141643 |
| Mode S Code Hex | ACC3A3 |