The Gimli Glider, Air Canada Flight One Forty-Three, and the Boeing Seven Sixty-Seven That Ran Out of Fuel at Forty-One Thousand Feet and Landed on a Drag Strip

On July 23, 1983, Air Canada Flight 143, a nearly new Boeing 767, ran completely out of fuel at 41,000 feet over Canada and lost both engines. Captain Bob Pearson, a weekend glider pilot, and First Officer Maurice Quintal glided the powerless airliner to an emergency landing on a former air force runway that had been converted into a drag strip at Gimli, Manitoba. All 69 people aboard survived, and the aircraft earned a permanent nickname: the Gimli Glider.

What Caused the Gimli Glider to Run Out of Fuel?

The root cause was a unit conversion error during Canada’s national switch to the metric system. For generations, Air Canada measured jet fuel in pounds. The Boeing 767 was the airline’s first aircraft designed from the ground up to operate in kilograms and liters.

The airplane’s automatic fuel quantity system was inoperative that night. An aircraft can still fly legally without it, but only if the crew calculates fuel by hand. The ground crew used a dripstick to measure the tanks physically, producing a reading in liters that then had to be converted into a weight.

To convert liters of jet fuel into kilograms, you multiply by the fuel’s density - a figure of roughly 0.8. Instead, the crew used 1.77, the number written on the fuel slips for years. But 1.77 is pounds per liter, not kilograms per liter.

They applied the pounds figure to a kilograms airplane. The result: they believed they had more than twice the fuel actually on board. The paperwork showed the tanks comfortably full for the Montreal–Ottawa–Edmonton trip. In reality, the aircraft was less than half fueled - and the one gauge that would have caught it was broken.

Both Engines Failed at 41,000 Feet

Flight 143 flew the short hop from Montreal to Ottawa, took on more passengers, then climbed to a cruise altitude of 41,000 feet bound for Edmonton. The night was smooth and routine - until it wasn’t.

Over Red Lake, Ontario, a cockpit warning chimed, signaling a fuel pressure problem on the left side. Pearson and Quintal assumed a faulty pump. Then a second chime sounded for the right side. Moments later, the left engine wound down and quit.

The crew declared an emergency and turned toward Winnipeg on one engine. Then the second engine stopped. The most modern jet in the fleet had become the world’s largest glider.

When the engines died, so did most of the panel. The generators rode on those engines, so the glass cockpit screens went dark. Pearson was left with a handful of battery-powered backup instruments and a ram air turbine - a small emergency propeller that deployed into the slipstream to supply just enough hydraulic pressure to move the flight controls.

How Did the Pilots Land a Powerless Boeing 767?

The decisive factor was airmanship. Captain Bob Pearson flew gliders on his days off, purely for the love of it. He understood, by feel, how to fly an engineless aircraft - how much altitude you trade for distance, and how to stretch a glide.

No one had ever glide-tested a 767. There was no manual chapter for losing both engines at 41,000 feet. Pearson worked out and held a precise best glide speed, knowing every knot too fast or too slow was runway he could never recover.

Meanwhile, Quintal solved the other problem: where to land. The math said Winnipeg was too far - they were descending faster than the ground was rising to meet them. Quintal remembered Gimli, a former Royal Canadian Air Force base where he had once been stationed, and knew it had a runway.

What the crew did not know was that Gimli was no longer an active base. Part of it had become a motorsport park, and on that Saturday the old runway was crowded with race cars, campers, and families - including two boys reportedly riding bicycles down the centerline.

The Forward Slip and the Landing

Pearson came over the threshold too high and too fast. A glider pilot can’t add power to go around, and diving would build too much speed and cause a long float off the far end.

So he used a sailplane technique: the forward slip. Crossing the controls - full rudder one way, opposite aileron the other - he skidded the 100-ton jet sideways through the air to dump altitude fast without gaining speed.

The landing gear added another problem. With no hydraulic power, the crew dropped the gear by gravity. The main gear fell and locked, but the nose gear fell only partway and did not lock.

Pearson put the mains down. The unlocked nose gear folded back under the aircraft, and the nose dropped onto the pavement, grinding and throwing sparks. That friction actually helped slow the airplane down. A small fire started at the nose, and the aircraft stopped short of the crowd, the campers, and the children.

Who Survived, and What Happened to the Aircraft?

No one was killed - not aboard the airplane and not on the ground. The most serious injuries were minor, suffered by a few passengers using the rear evacuation slides. Because the nose was plowed into the ground, the tail sat high in the air, sending those slides down at a steep angle. Local racers rushed over with the fire extinguishers from their own cars to help put out the nose fire.

The aircraft, nicknamed the Gimli Glider on the spot, was patched up enough to fly out of Gimli and returned to service. That same airframe flew for Air Canada for another 25 years before being retired to the desert.

Why the Gimli Glider Still Matters for Pilots

The accident is a textbook example of how disasters are built - not from one dramatic failure, but from a stack of small errors lining up: the broken gauge, the metric changeover, and the wrong density figure carried over from the pounds era. Catch any one of them, and Flight 143 is forgotten.

But the other half of the lesson is what saved 69 lives when those errors came due: skill. A captain whose weekend hobby happened to be the exact skill the moment demanded, and a first officer who remembered a runway from his younger days. When the panel went dark and quiet, they flew the airplane all the way to the ground.

The enduring takeaway is that you never know which skill you build today - the crosswind practice, the engine-out drills, the stick-and-rudder feel - will be the one that saves you. Modern automation did not bring Flight 143 home. A pilot’s hands and a lifetime of learning did.

Key Takeaways

Air Canada Flight 143 ran out of fuel and lost both engines at 41,000 feet on July 23, 1983, due to a fuel conversion error during Canada’s metric transition.
The crew mistakenly used 1.77 (pounds per liter) instead of the correct density of about 0.8 (kilograms per liter), loading less than half the fuel they thought they had.
Captain Bob Pearson, an experienced glider pilot, dead-stick landed the Boeing 767 using a forward slip on a former RCAF runway turned drag strip at Gimli, Manitoba.
All 69 people aboard survived with only minor injuries, and no one on the crowded runway was hurt.
The aircraft was repaired, returned to service as the Gimli Glider, and flew for another 25 years - a lasting case study in the value of airmanship over automation.