Air carrier captain describes a severe turbulence event where the aircraft gained 700 feet and lost ...

Attributes
ACN	1328268
Time
Date	201601
Local Time Of Day	1801-2400
Place
Locale Reference	ZJX.ARTCC
State Reference	FL
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Make Model Name	Medium Transport
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Flight Deck / Cabin / Aircraft Event Illness Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Weather / Turbulence

Narrative:

In cruise at FL330; we experienced severe turbulence for about 20-30 seconds. We gained 700 feet of altitude and lost 40 knots. The auto throttles and the autopilot disengaged uncommanded; and the aircraft was uncontrollable. We leveled off at FL340 and continued the flight; which was fine with ATC. ATC did not give us a phone number to call; nor did he seem to be concerned with our altitude deviation. I informed ATC about the turbulence; and to not send another airplane through the area if possible. The lead flight attendant informed me that one of our other flight attendants bumped her head; but she did not need medical attention. After we landed [at destination]; this flight attendant decided to seek medical attention the next day. The flight attendants went row by row to ensure passengers were okay; and no passenger injuries were discovered. We landed [at destination] and I made an entry in the aircraft maintenance log for a severe turbulence encounter.

Original NASA ASRS Text

Title: Air carrier Captain describes a severe turbulence event where the aircraft gained 700 feet and lost 40 knots of airspeed. No injuries initially reported; however one of the flight attendants; who bumped her head in the turbulence; did seek medical attention after landing at the destination.

Narrative: In cruise at FL330; we experienced severe turbulence for about 20-30 seconds. We gained 700 feet of altitude and lost 40 knots. The auto throttles and the autopilot disengaged uncommanded; and the aircraft was uncontrollable. We leveled off at FL340 and continued the flight; which was fine with ATC. ATC did not give us a phone number to call; nor did he seem to be concerned with our altitude deviation. I informed ATC about the turbulence; and to not send another airplane through the area if possible. The lead flight attendant informed me that one of our other flight attendants bumped her head; but she did not need medical attention. After we landed [at destination]; this flight attendant decided to seek medical attention the next day. The flight attendants went row by row to ensure passengers were okay; and no passenger injuries were discovered. We landed [at destination] and I made an entry in the aircraft maintenance log for a severe turbulence encounter.

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.

Air carrier captain describes a severe turbulence event where the aircraft gained 700 feet and lost 40 knots of airspeed. No injuries initially reported; however one of the flight attendants; who bumped her head in the turbulence; did seek medical attention after landing at the destination.