B767 flight crew lost control momentarily when turbulence caused the aircraft to climb and airspeed ...

Attributes
ACN	536036
Time
Date	200201
Day	Tue
Local Time Of Day	0001 To 0600
Place
Locale Reference	navaid : sqs.vortac
State Reference	MS
Altitude	msl single value : 37000
Environment
Weather Elements	Turbulence
Aircraft 1
Controlling Facilities	artcc : zme.artcc
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	536036
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : turbulence inflight encounter : weather other anomaly
Independent Detector	other flight crewa other flight crewb other other : 3
Resolutory Action	flight crew : exited adverse environment flight crew : returned to assigned altitude flight crew : regained aircraft control
Consequence	other
Supplementary
Problem Areas	Environmental Factor Weather
Primary Problem	Weather

Narrative:

I was PF captain. On day prior, had bad turbulence over oal. On day of event, I briefed the flight attendants on turbulence. I made PA to passenger about turbulence and seatbelt sign prior to takeoff. Approximately 200 mi west of mgm, aircraft in front of us reported moderate chop in tops. We turned seatbelt sign on, made PA announcement. We saw flashes so we used radar. No returns at all. As we got close to station, we asked which way others had gone. We asked for a right deviation for tops. I got on PA to flight attendants, then we got severe turbulence which overspd the aircraft, disconnected the autoplt on its own and pushed us up over 500 ft. I hand flew aircraft and pulled power back to idle, recovered back to FL370. Time was less than 10 seconds. Advised ATC, called flight attendants, made PA, called maintenance, checked handbook. Got climb to FL390. No further problem. 3 flight attendants had minor injuries and asked for help at destination. Didn't declare emergency. Debriefed maintenance at destination. Waited with flight attendants and paramedics. Flight attendants went to hotel ok. 1 passenger said he was hurt after he got off aircraft. Factors: was not tired. Was well aware of turbulence well in advance. We made precautions and got a turn south. Event occurred very fast once it began. ATC wanted no debrief with altitude deviation.

Original NASA ASRS Text

Title: B767 FLC LOST CTL MOMENTARILY WHEN TURB CAUSED THE ACFT TO CLB AND AIRSPD INCREASE RESULTING IN AUTO DISCONNECT OF THE AUTOPLT AND MINOR INJURY TO CABIN ATTENDANTS AND A PAX.

Narrative: I WAS PF CAPT. ON DAY PRIOR, HAD BAD TURB OVER OAL. ON DAY OF EVENT, I BRIEFED THE FLT ATTENDANTS ON TURB. I MADE PA TO PAX ABOUT TURB AND SEATBELT SIGN PRIOR TO TKOF. APPROX 200 MI W OF MGM, ACFT IN FRONT OF US RPTED MODERATE CHOP IN TOPS. WE TURNED SEATBELT SIGN ON, MADE PA ANNOUNCEMENT. WE SAW FLASHES SO WE USED RADAR. NO RETURNS AT ALL. AS WE GOT CLOSE TO STATION, WE ASKED WHICH WAY OTHERS HAD GONE. WE ASKED FOR A R DEV FOR TOPS. I GOT ON PA TO FLT ATTENDANTS, THEN WE GOT SEVERE TURB WHICH OVERSPD THE ACFT, DISCONNECTED THE AUTOPLT ON ITS OWN AND PUSHED US UP OVER 500 FT. I HAND FLEW ACFT AND PULLED PWR BACK TO IDLE, RECOVERED BACK TO FL370. TIME WAS LESS THAN 10 SECONDS. ADVISED ATC, CALLED FLT ATTENDANTS, MADE PA, CALLED MAINT, CHKED HANDBOOK. GOT CLB TO FL390. NO FURTHER PROB. 3 FLT ATTENDANTS HAD MINOR INJURIES AND ASKED FOR HELP AT DEST. DIDN'T DECLARE EMER. DEBRIEFED MAINT AT DEST. WAITED WITH FLT ATTENDANTS AND PARAMEDICS. FLT ATTENDANTS WENT TO HOTEL OK. 1 PAX SAID HE WAS HURT AFTER HE GOT OFF ACFT. FACTORS: WAS NOT TIRED. WAS WELL AWARE OF TURB WELL IN ADVANCE. WE MADE PRECAUTIONS AND GOT A TURN S. EVENT OCCURRED VERY FAST ONCE IT BEGAN. ATC WANTED NO DEBRIEF WITH ALTDEV.

Data retrieved from NASA's ASRS site as of July 2007 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.

B767 flight crew lost control momentarily when turbulence caused the aircraft to climb and airspeed increase resulting in automatic disconnect of the autoplt and minor injury to cabin attendants and a passenger.