| Tail Number / N-Number | N559RK |
| Manufacturer | ROBINSON HELICOPTER |
| Model | R44 |
| Year Built | 1999 |
| Manufacturer's Serial Number | 0559 |
| Aircraft Type | Rotorcraft |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 4 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | LYCOMING |
| Engine Model | 0-540 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 250 hp (187 kW) |
| Type of Registrant | Corporation |
| Owner Name | MIDWEST ROTOR INC |
| Street | 7073 SPAVALE DR |
| City | HIGH RIDGE |
| State | MO |
| Zip Code | 63049-1227 |
| Region | Central |
| County | Jefferson County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1999-01-14 |
| Certificate Issue Date | 1999-12-01 |
| Last Action Date | 2021-08-20 |
| Expiration Date | 2029-01-31 |
| Status | Valid Registration |
| Mode S Code | 51621133 |
| Mode S Code Hex | A7225B |