| Tail Number / N-Number | N557SM |
| Manufacturer | ROBINSON HELICOPTER COMPANY |
| Model | R44 II |
| Year Built | 2007 |
| Manufacturer's Serial Number | 11700 |
| 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 | IO-540-AE1A5 |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 260 hp (194 kW) |
| Type of Registrant | LLC |
| Owner Name | NATIONAL ROTORCRAFT LLC |
| Street | 1820 SONOMA AVE STE 110 |
| City | SANTA ROSA |
| State | CA |
| Zip Code | 95405-6617 |
| Region | Western-Pacific |
| County | Sonoma County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2007-06-14 |
| Certificate Issue Date | 2012-10-18 |
| Last Action Date | 2021-09-11 |
| Expiration Date | 2028-10-31 |
| Status | Valid Registration |
| Mode S Code | 51615410 |
| Mode S Code Hex | A71B08 |