On June 13, 1964, a Vickers Viscount (registration CF-THT) operated by Air Canada was involved in an aviation accident near Toronto-Lester Bowles Pearson, Canada during landing or approach. No fatalities were reported. Investigators recorded the probable cause as: The reason of the loss of power on the engine number two was caused by the presence of a foreign object the origine could not be determined. However, the reaction of the crew was incorrect due to lack of coordination. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A); 8 related events involving the same aircraft type or operator are linked below.
On final approach to Toronto Pearson Airport, a multi-engine aircraft lost power on engine number two. The captain mistakenly shut down engine number one, then increased power on right engines, causing asymmetric thrust, a left bank, stall, and crash. All 44 occupants evacuated safely.
Incident
On final approach to Toronto-Lester Bowles Pearson Airport, at an altitude of 700 feet and 3,200 meters from the runway 28 threshold, the engine number two lost power. The captain decided to shut down the affected engine but mistakenly stopped engine number one. Unable to restart engine number one, the crew increased power on both right engines, number three and four. Due to asymmetric thrust, the airplane banked left, then stalled and crashed short of the runway threshold.
Occupant Status and Damage
All 44 occupants were evacuated safely. The aircraft was damaged beyond repair.
Investigation and Probable Cause
The official investigation found that the loss of power on engine number two was caused by the presence of a foreign object, the origin of which could not be determined. However, the reaction of the crew was incorrect due to a lack of coordination.