Occurrence Location: N40/E166, North Pacific Ocean

Province:
Country: CANADA

World Area: North America

Reported By: Transportation Safety Board
AOR Number:

TSB Class Of Investigation: 5
TSB Occurrence No: A10F0200

Aircraft InformationFlight #:

Aircraft Category: Aeroplane
Country of Registration: CANADA

Make: BOEING
Model: 767 333

Year Built: 2001
Amateur Built: No

Engine Make: GENERAL ELECTRIC
Engine Model: CF6-80C2B6F

Engine Type: Turbo fan
Gear Type: Land

Phase of Flight: Cruise
Damage: No Damage

Owner: AIR CANADA
Operator: AIR CANADA (5262)

Operator Type: Commercial

Event InformationWeather - clear air turbulence (CAT)/wind shear/turbulence

Date: 2010-12-08

Further Action Required: Yes

O.P.I.: Maintenance & Manufacturing

Narrative: A10F0200: The Air Canada Boeing 767-333, aircraft, C-GHLT, operating as ACA004, was en route from Tokyo, Narita to Vancouver, cruising at FL330. In the vicinity of N40/E166 the aircraft encountered severe turbulence. Altitude climb variations of plus and minus 1000 feet per minute were encountered and the mach decreased from .81 to .74. The seat belt sign was on prior to the encounter. There were no injuries. Upon arrival in Vancouver, Maintenance accomplished a severe turbulence inspection and no faults were found.