Canadian investigators have disclosed that an alarm which prompted a De Havilland Dash 8-400 to abort take-off was traced to a mobile phone.

The WestJet Encore aircraft had been operating the WR3125 service from Edmonton to Kelowna on 14 January.

According to a bulletin from Transportation Safety Board of Canada, an “unknown alarm” sounded during the take-off roll.

WestJet Encore Dash 8-c-Martin Kulcsar Creative Commons

Source: Martin Kulcsar/Creative Commons

Investigators state that the turboprop, similar to this one, was departing Edmonton

The crew rejected the take-off and declared an emergency – part of a standard procedure – but cancelled the emergency as the turboprop taxied off the runway.

“Upon further inspection by the flight crew, the unknown alarm was coming from a cellular telephone,” the safety board states.

The aircraft departed without further incident on its second attempt.

None of the 44 occupants was injured. The aircraft involved (C-GENK) was delivered new to the carrier in 2016.