| Tail Number / N-Number | N666U |
| Pending N-Number Change | N281MK |
| Manufacturer | ROBINSON HELICOPTER COMPANY |
| Model | R44 II |
| Year Built | 2004 |
| Manufacturer's Serial Number | 10476 |
| 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 | LLC |
| Owner Name | KLINKAIRCRAFT LLC |
| Street | 160 CROWELL RD |
| City | HOPKINTON |
| State | NH |
| Zip Code | 03229-2615 |
| Region | New England |
| County | Merrimack County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2004-09-01 |
| Certificate Issue Date | 2022-11-09 |
| Last Action Date | 2022-11-09 |
| Expiration Date | 2029-11-30 |
| Status | Valid Registration |
| Mode S Code | 52146105 |
| Mode S Code Hex | A8CC45 |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N666U.
| Tail Number / N-Number | N666U |
| Manufacturer | ROBINSON HELICOPTER |
| Model | R22 BETA |
| Year Built | 1989 |
| Manufacturer's Serial Number | 1036 |
| 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 | 0-320 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Type of Registrant | Individual |
| Owner Name | RHEDOM AVIATION CORP |
| Street | 1128 NARRAGANSETT BLVD |
| City | CRANSTON |
| State | RI |
| Zip Code | 02905 |
| County | Merrimack County |
| Country | US |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1989-06-12 |
| Certificate Issue Date | 1990-02-09 |
| Last Action Date | 2005-10-18 |
| Last Status | The Triennial Aircraft Registration form was mailed and has not been returned by the Post Office |
| Cancellation Date | 2006-12-13 |