B737 flight crew reported a momentary loss of control climbing through FL360 after encountering seve...

Attributes
ACN	1454043
Time
Date	201706
Local Time Of Day	0601-1200
Place
Locale Reference	ZDV.ARTCC
State Reference	CO
Environment
Light	Daylight
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Aircraft 2
Make Model Name	MD-11
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 288
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 269
Events
Anomaly	Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Wake Vortex Encounter

Narrative:

While climbing through FL360 to our assigned altitude of FL370 we encountered severe wake turbulence from a preceding md-11 aircraft; which was at an altitude of FL390 and on a diverging heading. Our aircraft suddenly made a violent left banking roll and pitched up. The bank exceeded approximately 30 degrees of roll. We also had momentary loss of aircraft control. I was the pilot flying and immediately disconnected the autopilot and had to aggressively apply pitch and roll input in order to get the aircraft back under control. We immediately contacted ATC to report the incident and to dispatch via ACARS. We also contacted the flight attendants to check their status of any injuries as well as the passengers. The flight attendants reported no injuries to themselves or the passengers. One flight attendant did report she had fallen on top of the passengers but was ok. Approximately 30 minutes later the same flight attendant notified us that she was not feeling well and wanted to get replaced once we arrived. We asked her if she needed any medical attention and she refused. We continued with no other issues. Once we landed I called dispatch; maintenance control; and the chief pilot on call. A logbook entry was made due to the severe wake turbulence.

Original NASA ASRS Text

Title: B737 flight crew reported a momentary loss of control climbing through FL360 after encountering severe wake turbulence from an MD-11 at FL390.

Narrative: While climbing through FL360 to our assigned altitude of FL370 we encountered severe wake turbulence from a preceding MD-11 aircraft; which was at an altitude of FL390 and on a diverging heading. Our aircraft suddenly made a violent left banking roll and pitched up. The bank exceeded approximately 30 degrees of roll. We also had momentary loss of aircraft control. I was the Pilot Flying and immediately disconnected the autopilot and had to aggressively apply pitch and roll input in order to get the aircraft back under control. We immediately contacted ATC to report the incident and to Dispatch via ACARS. We also contacted the Flight Attendants to check their status of any injuries as well as the passengers. The Flight Attendants reported no injuries to themselves or the passengers. One Flight Attendant did report she had fallen on top of the passengers but was OK. Approximately 30 minutes later the same Flight Attendant notified us that she was not feeling well and wanted to get replaced once we arrived. We asked her if she needed any medical attention and she refused. We continued with no other issues. Once we landed I called Dispatch; Maintenance Control; and the Chief Pilot on Call. A logbook entry was made due to the severe wake turbulence.

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.

B737 flight crew reported a momentary loss of control climbing through FL360 after encountering severe wake turbulence from an md-11 at FL390.