de Havilland DHC-2 Beaver float plane, not one from crash. Image Credit: A Wikimedia Commons

TSB blames optical illusion for plane crash

TSB blames optical illusion and unsecured cargo for 2016 fatal plane crash near Prince George

The fatal crash of a small float plane in central British Columbia was partly the result of an optical illusion associated with low-altitude flights, as well as overweight and improperly secured cargo, the Transportation Safety Board says.

A pilot died and two of four passengers were seriously injured when the de Havilland DHC-2 Beaver float plane went down during a hunting expedition in October 2016 near Laidman Lake, about 150 kilometres southwest of Prince George.

The board’s report describes how the aircraft was more than 300 kilograms over its maximum allowable weight, and because the cargo was unsecured, it hit the rear passenger seats when the plane crashed.

RELATED: Coroner releases name of victim from Monday’s plane crash

The report also says the pilot likely misjudged how close the plane was to the ground because of an optical illusion associated with flying under an overcast sky and over snow-covered vegetation, causing the aircraft to stall when the pilot tried to avoid hitting the hillside.

“The lack of features to provide scale in the snow-covered terrain, together with the minimal contrast among the dense trees given the diffuse light conditions, likely disguised the upsloping terrain and the actual horizon,” the report says.

“As the slope steepened, the perceived horizon would have moved upward in the windscreen, and the pilot may have pitched the aircraft up to maintain a constant angle between the pilot’s reference point on the aircraft and the rising terrain.”

The two other passengers on board suffered minor injuries during the crash.

The Transportation Safety Board is recommending that all DHC-2 aircraft that operate commercially in Canada be equipped with a system that would issue a warning as an aircraft is about to stall.

“It is reasonable to conclude that the absence of a stall-warning system deprived the pilot of the last line of defence against an aerodynamic stall and the subsequent loss of control of the aircraft.”

The agency says this recommendation would not have helped in this incident because the aircraft was privately operated, but it underscores the benefits of a stall-warning system.

The Transportation Safety Board investigates marine, pipeline, railway and aviation incidents and its purpose is to improve transportation safety, not attribute blame or find fault.

The Canadian Press

Like us on Facebook and follow us on Twitter.

Just Posted

11th annual Magic Cottage kicks off this weekend in Port Alberni

Cottage will be open over two weekends in November

Port Alberni RCMP hold second bike registration event

Project 529 will be at Canadian Tire on Saturday, Nov. 17

Husky Gas Station robbed on Third Avenue

Port Alberni RCMP still searching for suspect

New Coast Guard radar boosts marine traffic monitoring off B.C. coast

Six radar installations set up for Georgia Strait to Queen Charlotte Strait to Prince Rupert

Port Alberni care homes benefit from funding to purchase new safety equipment

Echo Village and Fir Park Village will be receiving $32,500 each

Trudeau offers to help Pacific islands face climate change impact

Prime Minister Justin Trudeau met with the leaders from the Pacific island nations on Saturday during the APEC Summit in Papua New Guinea

Price makes 36 saves as Habs edge Canucks 3-2

Late goal lifts Montreal past Vancouver

BC Minister of Agriculture loses stepson to accidental overdose

Lana Popham announces death of her 23-year-old stepson, Dan Sealey

Canadian military’s template for perfect recruits outdated: Vance

Gen. Jonathan Vance, the chief of defence staff says that the military has to change because the very nature of warfare is changing, particularly when it comes to cyber-warfare

‘Toxic’ chosen as the Word of the Year by Oxford Dictionaries

Other top contenders for 2018 include ‘gaslighting’ and ‘techlash’

RCMP bust illegal B.C. cannabis lab

Marijuana may be legal but altering it using chemicals violates the Cannabis Act

Canada defeats Germany 29-10 in repechage, moves step closer to Rugby World Cup

Hong Kong needs a bonus-point win over Canada — scoring four or more tries — while denying the Canadians a bonus point

Avalanche Canada in desperate need of funding

The organization provides avalanche forecasting for an area larger than the United Kingdom

5 B.C. cities break temperature records

Parts of B.C. remain warm, at 10 C, while others feeling chilly

Most Read