B767 flight crew reported encountering severe turbulence over the north atlantic injuring several pa...

Narrative:

We were at cruise and encountered severe turbulence. Our radar was on in the wx/turb position with the pws (predictive wind shear) switch on. Our radar was set to automatic tilt. The resultant tilt was -1. The radar gain was near maximum. We had flown at least 2.5 hours with no weather seen on our radar screens set to 360 miles. There was no weather or turbulence forecast near our event position. The flight was smooth with the seat belt light off for approximately 2 hours. Our speed was set in VNAV at .79 mach. The plane was suddenly in severe turbulence. The autopilot disengaged and I silenced the warning and began to hand fly. The radar still showed no weather or traffic on TCAS. The left engine generator turned off and so did both utility buses. Our altitude may have varied by +300 and -200. The turbulence lasted for around 30 seconds. Towards the end of the turbulence; the copilot's lower right front window had some low level st elmo's fire for 5 seconds. The PNF called for the captain to return to the cockpit after turning on the seat belt sign. We accomplished the appropriate checklists and called the flight attendant stations to check for injuries. Two flight attendants in the rear of the aircraft were injured along with several passengers. The captain assessed the injuries of the entire cabin and returned to the cockpit to assume his seat. We coordinated with dispatch; who handled medlink for us. We collectively made the decision to divert and not continue to destination. The landing was uneventful and no delays after were encountered. We were cleared directly off of [our] nat [track] to ZZZZ. No weather or turbulence was encountered after the event except for scattered layers near ZZZZ. The captain; flight attendants; and dispatcher all did a fantastic job. The support on the ground in ZZZZ was outstanding. All parties associated with our diversion should be commended.

Original NASA ASRS Text

Title: B767 flight crew reported encountering severe turbulence over the North Atlantic injuring several passengers and flight attendants. The crew elected to divert to an alternate airport rather than continue to their destination.

Narrative: We were at cruise and encountered severe turbulence. Our radar was on in the Wx/Turb position with the PWS (Predictive Wind Shear) switch on. Our radar was set to automatic tilt. The resultant tilt was -1. The radar gain was near maximum. We had flown at least 2.5 hours with no weather seen on our radar screens set to 360 miles. There was no weather or turbulence forecast near our event position. The flight was smooth with the seat belt light off for approximately 2 hours. Our speed was set in VNAV at .79 Mach. The plane was suddenly in severe turbulence. The autopilot disengaged and I silenced the warning and began to hand fly. The radar still showed no weather or traffic on TCAS. The Left Engine Generator turned off and so did both utility buses. Our altitude may have varied by +300 and -200. The turbulence lasted for around 30 seconds. Towards the end of the turbulence; the copilot's lower right front window had some low level St Elmo's fire for 5 seconds. The PNF called for the Captain to return to the cockpit after turning on the Seat Belt sign. We accomplished the appropriate checklists and called the flight attendant stations to check for injuries. Two Flight attendants in the rear of the aircraft were injured along with several passengers. The Captain assessed the injuries of the entire cabin and returned to the cockpit to assume his seat. We coordinated with dispatch; who handled Medlink for us. We collectively made the decision to divert and not continue to destination. The landing was uneventful and no delays after were encountered. We were cleared directly off of [our] NAT [track] to ZZZZ. No weather or turbulence was encountered after the event except for scattered layers near ZZZZ. The Captain; Flight Attendants; and Dispatcher all did a fantastic job. The support on the ground in ZZZZ was outstanding. All parties associated with our diversion should be commended.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1384255
Time
Date	201608
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZZ.ARTCC
State Reference	FO
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Route In Use	Oceanic
Flight Plan	IFR
Person 1
Function	Relief Pilot Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 200 Flight Crew Type 1756
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Total 11300 Flight Crew Type 3196
Events
Anomaly	Flight Deck / Cabin / Aircraft Event Illness Inflight Event / Encounter Weather / Turbulence

B767 flight crew reported encountering severe turbulence over the north atlantic injuring several passengers and flight attendants. The crew elected to divert to an alternate airport rather than continue to their destination.