The Potomac Collision (systemic silence)

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One of my roles within Defence is HF/ NTS facilitator (Human Factors / Non-Technical Skills). It means working with aircrew, maintenance, ATC and support agencies to understand the human nature behind serious accidents. I'll share some with you. I hope the tone isn't too dark.

Nobody crashes a plane with one mistake.

In the Potomac collision, an American Airlines passenger aircraft and a US Army Blackhawk helicopter crashed into each other, resulting in 67 fatalities. The airliner was on final approach to land at Reagan International Airport, a stone's throw from the White House. The helicopter was on a military training flight.

The NTSB didn't find a cause. They found a chain.

A faulty altimeter.

Separate radio frequencies.

A controller managing two jobs at once.

A missed instruction.

A course correction that didn't happen.

A helicopter route that left 75 feet between military and civilian aircraft on final approach.

Seventy-five feet. In the busiest airspace in the world.

Here's what makes this so hard to catch in real time. Each of those factors, assessed on its own, looks manageable. They sit comfortably below the line. None of them a showstopper.

Together, they bulk up as aggregate risk: the point where individually acceptable conditions stack into collectively catastrophic ones.

The risk isn't in the single piece. It's in the accumulation.

And the accumulation happens quietly. Nobody sounds the alarm because at each step, nothing looks alarming. The system appears to be coping. Work is getting done. The checks are passing.

"We've always done it this way." "It'll be right." "No one said anything last time."

That's not reassurance. That's a whole lot of aggregate risk building.

The question isn't whether your workplace has these stacking conditions. I can assure you, it does. Every workplace does. The question is whether anyone is trained to see the pattern forming. To look across the whole picture, not just their piece of it.

Human Factors gives you that view. Throwing a HOP lens over the top gives you that view. They’re not just courses you attend. They’re a way of looking at the world that makes you dangerous to complacency.

When you work in a high-risk environment, considering all hazards into an aggregate risk pattern coupled with your HF and HOP training, forces a level of critical thinking that might just save the day.

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