B736, Montréal QC Canada, 2015

B736, Montréal QC Canada, 2015

Summary

On 5 June 2015, a Boeing 737-600 landed long on a wet runway at Montréal and the crew then misjudged their intentionally-delayed deceleration because of an instruction to clear the relatively long runway at its far end and were then unable to avoid an overrun. The Investigation concluded that use of available deceleration devices had been inappropriate and that deceleration as quickly as possible to normal taxi speed before maintaining this to the intended runway exit was a universally preferable strategy. It was concluded that viscous hydroplaning had probably reduced the effectiveness of maximum braking as the runway end approached.

Description

On 5 June 2015, a Boeing 737-600 (C-GWCT) being operated by WestJet on a scheduled domestic passenger flight from Toronto to Montréal as WJA 588 touched down off a day VMC ILS approach at destination beyond the normal position and failed to stop before reaching the end of the runway. It came to a stop on grass approximately 60 metres further on but was undamaged and none of the 112 occupants were injured.

The aircraft in its final stopping position. [reproduced from the Official Report]

Investigation

An Investigation was carried out by the Canadian TSB. Relevant data was successfully recovered from both the FDR and the 2 hour CVR. The CB of the latter was tripped after the aircraft had stopped.

It was found that the Captain, who was PF for the investigated flight, had been promoted to command just over a year previously after seven years as a First Officer on type and had accumulated 9,000 total flying hours including 7,500 hours on type. The First Officer had gained his 737 type rating 4½ years previously and had accumulated 13,898 flying hours including 3,360 hours on type. The accident flight was the crew's first flight of the day.

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