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

Revelstoke bowl turner expanding to bigger markets

Corin Flood turns hundreds of bowls a year in his back yard shop

All regional district fields and ball diamonds closed

Soaking ground leads to closure of CSRD sports fields to prevent damage

Clovechok sitting on Select Standing Committee of Finance and Government Services

Catching up with the MLA for Columbia River-Revelstoke

VIDEO: The ‘most cosmopolitan’ of butterflies could migrate to B.C.

The painted lady butterfly will likely arrive this summer from Southern California

West Kelowna acquires land for Rose Valley Water Treatment Plant

The city has acquired 24 acres on Bartley Road

Sentencing begins for indecent caller

Vancouver Island man pleaded guilty to making indecent phone and video calls to women across B.C.

Sources say Trudeau rejected Wilson-Raybould’s conservative pick for high court

Wilson-Raybould said Monday “there was no conflict between the PM and myself”

First Nations public art piece stolen in Nanaimo

Spindle Whorl went missing over the weekend, according to Nanaimo RCMP

RV lifestyle comes to the Okanagan

BC Interior RV Show returns to Penticton for the eighth year

Father-son duo at B.C. Children’s Hospital helps new dads fight depression

The pair teamed up to introduce the only known research-based mindfulness workshop for new dads

Mexican restaurant in B.C. told to take down Mexican flag

General manager of Primo’s Mexican Grill in White Rock: ‘I’ve never heard of anything like this’

B.C. NDP moves to provide tax credits, tax cut for LNG Canada

Provincial sales tax break of $596 million repayable after construction

Most Read