N666U is not assigned to an aircraft right now: the number is reserved in the FAA registry. The FAA files list 2 earlier registrations of this number, shown below.
Reserved N-number
- Reservation
- 2-year hold after cancellation
- Reserved on
- Jun 8, 2023
Earlier registrations of this number
| Canceled | Aircraft | Serial | Year | Exported to | Same airframe today |
|---|---|---|---|---|---|
| Jun 8, 2023 | ROBINSON HELICOPTER COMPANY R44 II | 10476 | 2004 | ||
| Dec 13, 2006 | ROBINSON HELICOPTER R22 BETA | 1036 | 1989 |
NTSB accident and incident records
| Date | Place | Aircraft (as NTSB recorded it) | Damage | Highest injury | NTSB no. |
|---|---|---|---|---|---|
| May 23, 2022 | Nashua, NH | Robinson Helicopter Company R44 II | Substantial | Minor | ERA22LA236 |
From the NTSB aviation accident database (events since 2008, data through Oct 28, 2026), matched by N-number. An N-number can move between aircraft, so each row is checked against the serial number on the current registration.