Incident Overview
An aircraft cruising at flight level 310 (FL310) on a route between Puerto Rico and New York experienced clear air turbulence (CAT) that caused occupants to be thrown about the cabin. One flight attendant sustained a broken wrist as a result of the event.
Response and Diversion
The flight crew diverted the aircraft to Bermuda, where the injured individuals were treated at a medical facility and subsequently released.
Flight Conditions
According to the flight crew, the aircraft was operating in cirro-stratus clouds at the time of the occurrence. The airborne radar displayed no echoes, indicating an absence of precipitation or convective activity.
Seatbelt Sign Status
The seatbelt sign was illuminated when the turbulence occurred. The captain stated in an interview that his normal procedure was to keep the seatbelt sign illuminated at all times during flight.