A B767-300, cleared to climb through FL340 which is to be occupied by an MD11 10 mi ahead descending from FL350, encounters severe wake turbulence, temporarily losing control of the aircraft during a roll right and a snap to the left, 120 mi east of cyqx, nf.

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Attributes
ACN	475412
Time
Date	200006
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : cyqx.airport
State Reference	NF
Altitude	msl bound lower : 33000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : czqx.artcc
Operator	common carrier : air carrier
Make Model Name	MD-11
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Route In Use	enroute : direct enroute : atlantic
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : czqx.artcc
Operator	common carrier : air carrier
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : enroute altitude change
Route In Use	enroute : atlantic enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 125 flight time total : 9000 flight time type : 3000
ASRS Report	475412
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control flight crew : exited adverse environment
Consequence	Other
Supplementary
Problem Areas	Airspace Structure ATC Human Performance Flight Crew Human Performance Environmental Factor
Primary Problem	Environmental Factor
Situations
ATC Facility	procedure or policy : czqx.artcc

Narrative:

On jun/fri/00, MD11 aircraft operating from jfk to inn. While in gander's airspace, the MD11 aircraft was cleared from FL350 to FL340. The position was between vixvn and 49n50w, 10 mi ahead of the B767 flight. At XB50 the MD11 aircraft received a radio message from the B767 flight. It reported that it 'almost rolled over' from the wake turbulence encountered at FL340. The B767 reported a slow roll to the right (15 degrees) followed by a snap roll to the left until the pilot disconnected the autoplt and applied opposite control forces. The maximum bank angle was 30 degrees. The B767 aircraft was climbing from FL330 to FL350 and became destabilized at FL340. Aircraft separation was 10 mi in trail. Both aircraft were in radar contact. The B767 was flying at mach .80. The incident took place at XC48Z. The MD11 airplane flew at FL340, mach .82.

Original NASA ASRS Text

Title: A B767-300, CLRED TO CLB THROUGH FL340 WHICH IS TO BE OCCUPIED BY AN MD11 10 MI AHEAD DSNDING FROM FL350, ENCOUNTERS SEVERE WAKE TURB, TEMPORARILY LOSING CTL OF THE ACFT DURING A ROLL R AND A SNAP TO THE L, 120 MI E OF CYQX, NF.

Narrative: ON JUN/FRI/00, MD11 ACFT OPERATING FROM JFK TO INN. WHILE IN GANDER'S AIRSPACE, THE MD11 ACFT WAS CLRED FROM FL350 TO FL340. THE POS WAS BTWN VIXVN AND 49N50W, 10 MI AHEAD OF THE B767 FLT. AT XB50 THE MD11 ACFT RECEIVED A RADIO MESSAGE FROM THE B767 FLT. IT RPTED THAT IT 'ALMOST ROLLED OVER' FROM THE WAKE TURB ENCOUNTERED AT FL340. THE B767 RPTED A SLOW ROLL TO THE R (15 DEGS) FOLLOWED BY A SNAP ROLL TO THE L UNTIL THE PLT DISCONNECTED THE AUTOPLT AND APPLIED OPPOSITE CTL FORCES. THE MAX BANK ANGLE WAS 30 DEGS. THE B767 ACFT WAS CLBING FROM FL330 TO FL350 AND BECAME DESTABILIZED AT FL340. ACFT SEPARATION WAS 10 MI IN TRAIL. BOTH ACFT WERE IN RADAR CONTACT. THE B767 WAS FLYING AT MACH .80. THE INCIDENT TOOK PLACE AT XC48Z. THE MD11 AIRPLANE FLEW AT FL340, MACH .82.

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.