Event Details

Title:Roll Oscillations on Landing, two Air Canada Airbus 321-s211, C-GJVX and C-GIUF, Toronto/Lester B. Pearson International Airport, Ontario, 07 December 2002 (Recommended)
Micro summary:These two A320s encountered PIOs as a result of operating in atmospheric conditions not anticipated by the flight control logic.
Event Time:2002-12-07 at 1607 EST
File Name:2002-12-07-CA.pdf
Publishing Agency:Transportation Safety Board of Canada (TSB)
Publishing Country:Canada
Report number:A02O0406
Site of event:Approach and landing, Toronto
First AirplaneSecond Airplane
Destination:Toronto/Lester B. Pearson International Airport, Mississauga, Ontario, Canada
Airplane Type(s):Airbus A321-211
Flight Phase:Approach
Operator(s):Air Canada
Type of flight:Revenue
Serious Injuries:0
Other Injuries:0
Executive Summary:At approximately 1607 Eastern standard time (EST), Air Canada Flight 457 (ACA457), an Airbus A321-211 aircraft (registration C-GJVX, serial number 1726) was on approach to Toronto/Lester B. Pearson International Airport (LBPIA), Ontario, with 123 passengers and 6 crew on board. At approximately 140 feet above ground level (agl), on final approach to Runway 24R with full flaps selected, the aircraft experienced roll oscillations. The flight crew levelled the wings and the aircraft touched down firmly. During the approach, the aircraft had accumulated mixed ice on areas of the wing and the leading edge of the horizontal stabilizer that are not protected by anti- ice systems.

Approximately three hours later on the same day, Air Canada Flight 1130 (ACA1130), an Airbus A321-211 aircraft (registration C-GIUF, serial number 1638), with 165 passengers and 7 crew on board was on approach to Runway 24R at LBPIA. At 1859 EST and approximately 50 feet agl, the aircraft experienced roll oscillations. The flight crew conducted a go-around, changed flap settings, and returned for an uneventful approach and landing. At the gate, it was noted that the aircraft had accumulated ice on areas of the wing and the leading edge of the horizontal stabilizer that are not protected by anti-ice systems. There was no damage to either aircraft nor injury to the crew or passengers.

Given the similarities between these two occurrences, this report presents the Boardís investigations of both occurrences: A02O0405 (C-GJVX) and A02O0406 (C-GIUF).
Learning Keywords:Operations - Icing
Operations - Upset - Uncommanded or excessive Roll
Systems - Automation Design
Systems - Automation Errors
Systems - Flight Control System
Other - Certification


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