B767 flight crew encounters moderate to severe turbulence during climb.

Attributes
ACN	717369
Time
Date	200611
Place
Locale Reference	atc facility : czqm.artcc
State Reference	NB
Altitude	msl single value : 31000
Environment
Flight Conditions	IMC
Weather Elements	Turbulence Rain
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : czqm.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 : first officer
ASRS Report	717369
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather inflight encounter : turbulence
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued advisory flight crew : returned to assigned altitude
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Environmental Factor Flight Crew Human Performance Weather
Primary Problem	Environmental Factor

Narrative:

We crossed kanni intersection; FL310; talking with moncton center. We began to experience light to moderate turbulence and decided to reduce airspeed to mach .79. We were IMC with nothing showing on radar. Smooth flight up until this point. Just east of kanni; the turbulence became severe and ascended us rapidly through FL315. (There was a brief period of moderate rain/ice.) the autoplt disconnected and the PF took manual control of airplane reducing thrust and arresting the ascent at approximately FL319. We started descent back to FL310 when moncton center asked us to verify altitude. We reported severe turbulence and the abrupt updraft. Leveling at FL310 now encountering light turbulence we requested climb to FL350. We did not encounter any more moderate or severe turbulence and at no time did we paint anything on radar.

Original NASA ASRS Text

Title: B767 FLT CREW ENCOUNTERS MODERATE TO SEVERE TURB DURING CLB.

Narrative: WE CROSSED KANNI INTXN; FL310; TALKING WITH MONCTON CTR. WE BEGAN TO EXPERIENCE LIGHT TO MODERATE TURB AND DECIDED TO REDUCE AIRSPD TO MACH .79. WE WERE IMC WITH NOTHING SHOWING ON RADAR. SMOOTH FLT UP UNTIL THIS POINT. JUST E OF KANNI; THE TURB BECAME SEVERE AND ASCENDED US RAPIDLY THROUGH FL315. (THERE WAS A BRIEF PERIOD OF MODERATE RAIN/ICE.) THE AUTOPLT DISCONNECTED AND THE PF TOOK MANUAL CTL OF AIRPLANE REDUCING THRUST AND ARRESTING THE ASCENT AT APPROX FL319. WE STARTED DSCNT BACK TO FL310 WHEN MONCTON CTR ASKED US TO VERIFY ALT. WE RPTED SEVERE TURB AND THE ABRUPT UPDRAFT. LEVELING AT FL310 NOW ENCOUNTERING LIGHT TURB WE REQUESTED CLB TO FL350. WE DID NOT ENCOUNTER ANY MORE MODERATE OR SEVERE TURB AND AT NO TIME DID WE PAINT ANYTHING ON RADAR.

Data retrieved from NASA's ASRS site as of January 2009 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.