Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N556MM.
| Tail Number / N-Number | N556MM |
| Manufacturer | ROBINSON HELICOPTER COMPANY |
| Model | R44 II |
| Year Built | 2003 |
| Manufacturer's Serial Number | 10111 |
| 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 SER |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 300 hp (224 kW) |
| Type of Registrant | Corporation |
| Owner Name | JOHNSON HELICOPTER SERVICES LLC |
| Street | 55052 HWY 59 |
| City | EMERSON |
| State | IA |
| Zip Code | 51533 |
| Country | US |
| Airworthiness Classification | Multiple |
| Airworthiness Date | 2011-05-19 |
| Certificate Issue Date | 2011-04-30 |
| Last Action Date | 2011-04-30 |
| Last Status | Registration Expired - Pending Cancellation |
| Cancellation Date | 2017-10-20 |
| Mode S Code | 51613324 |
| Mode S Code Hex | A716D4 |