The Gimli Glider, the Air Canada Boeing Seven Sixty-Seven That Ran Out of Fuel at Forty-One Thousand Feet and Glided Dead-Stick Onto an Old Drag Strip in Manitoba

On July 23, 1983, Air Canada Flight 143 - a brand-new Boeing 767 with two crew and 61 passengers aboard - ran out of fuel at 41,000 feet over Manitoba and became the largest glider in the world. With both engines dead and most of its instruments dark, Captain Bob Pearson, a weekend glider pilot, flew the powerless jet to a dead-stick landing on a former air base at Gimli. Everyone survived, and the aircraft earned a permanent nickname: the Gimli Glider.

What Happened to Air Canada Flight 143?

Flight 143 was flying from Montreal to Edmonton with a stop in Ottawa. The 767 was one of the newest jets in the fleet - so new it had a glass cockpit when most airliners still flew steam gauges. It was also Canada’s first metric aircraft, and that detail sits at the heart of everything that went wrong.

In the left seat was Captain Bob Pearson, a career airline pilot with roughly 15,000 hours. Crucially, Pearson also flew gliders for fun on his weekends - airplanes that stay aloft on nothing but air, patience, and skill. In the right seat was First Officer Maurice Quintal, who carried a piece of personal history that would matter enormously before the day was out.

How Does a Modern Jetliner Run Out of Fuel?

The 767 had a fault in its fuel quantity system - a processor problem left the cockpit fuel gauges blank. To work around it, the ground crew measured the fuel manually using a dripstick under the wing, much like checking the oil in a car. That measurement was accurate. It produced a correct volume in liters.

The problem was the conversion. Flight planning depends on the weight of fuel in kilograms, not the volume. To convert liters to kilograms, you multiply by the fuel’s density.

The crew reached for a conversion factor of 1.77 - but that number is pounds per liter. The correct factor for kilograms per liter was 0.8. The math was done carefully, and even checked twice, but it produced a confident wrong answer. The jet everyone believed was fully fueled for a cross-country haul was actually carrying less than half the fuel it needed. With the gauges dark and the paperwork clean, the crew had no reason to suspect anything.

When Did the Crew Realize They Were Out of Fuel?

At cruise altitude, a warning tone announced low fuel pressure on the left engine. Because the fuel system was already known to be faulty, Pearson reasonably assumed a failing fuel pump and began considering a precautionary diversion to Winnipeg.

Then a second warning sounded - low pressure on the right side too. Two pumps do not fail simultaneously for no reason. The left engine flamed out first, and a couple of minutes later the right engine wound down as well. The steady hum of two turbofans gave way to something no airline pilot ever wants to hear: silence, broken only by wind over the fuselage.

When the engines quit, so did most of the electrical power they generated. The glass cockpit went dark, leaving Pearson with a handful of basic backup instruments and a ram air turbine (RAT) - a small emergency propeller that drops into the airstream and spins, providing just enough hydraulic pressure to move the flight controls.

How Did the Pilots Fly a Plane With No Engines?

Airline crews train for an engine failure. They do not train for the total loss of both engines, because the odds are supposed to be effectively zero. There was no published best glide speed for a 767 - Boeing never expected anyone would need one.

This is where Pearson’s weekend hobby became decisive. A glider pilot understands in his hands how to trade altitude for distance and how to find the speed that stretches a glide farthest. Pearson settled the airplane at about 220 knots by feel and flew it like the biggest sailplane in history.

Meanwhile, Quintal calculated their range and reached a grim conclusion: Winnipeg was too far. They were sinking too fast to reach it. Then Quintal recalled his own history - during his time in the Canadian military, he remembered a former Royal Canadian Air Force base at Gimli, on the shore of Lake Winnipeg. It was closer, and it was reachable.

Why Was Landing at Gimli So Dangerous?

What no one in the cockpit knew was that the old air base was no longer a quiet military field. Part of it had been converted into a motor sports park with an active drag strip - and that very afternoon it was packed with racers, campers, and families. People were barbecuing beside a runway that a hundred-ton airliner was now falling toward with no engines.

A glider gets exactly one approach. With no throttle, you can’t add power to stretch a short approach or go around if you come in hot. Pearson found himself too high and too fast - far too much energy. A pilot trained only on powered aircraft would have floated far down the runway and off the end.

So Pearson reached into the glider pilot’s toolkit and performed a forward slip - full rudder one way, control column the other, crossing the controls to turn the fuselage sideways into the airflow like a barn door. The maneuver dumps altitude fast without gaining airspeed. He slipped a 100-ton Boeing jetliner sideways down final approach, dead-stick, in front of a crowd of spectators.

What Happened During the Landing?

The loss of hydraulic pressure meant the landing gear had to be extended by gravity. The main gear fell and locked, but the nose gear dropped without locking into place.

On touchdown, the main wheels slammed onto the old runway and Pearson braked so hard he blew two tires. The unlocked nose gear then folded under the aircraft, dropping the nose onto the pavement in a shriek of grinding metal and sparks. That dragging nose turned out to be a blessing - it helped scrub off speed and kept the jet tracking straight.

The airplane slid to a stop a couple hundred feet from the crowd. No one on the ground was hurt, and no one aboard was killed. A few passengers suffered minor injuries evacuating, because the nose-down attitude left the rear slides short of the ground. Small grass fires around the nose were put out first not by fire trucks, but by the racers running over with their own extinguishers.

What Happened to the Gimli Glider Afterward?

The aircraft was patched up on-site well enough to be flown out, fully repaired, and returned to service. It flew for Air Canada for roughly another 25 years, known throughout the industry by a single name: the Gimli Glider.

The subsequent investigation by Canadian aviation authorities did not pin the accident on the pilots alone. It identified a chain of failures: a dark fuel gauge, confusing procedures over who verified the fuel and how, a brand-new metric aircraft in a country still transitioning between unit systems, and one wrong conversion factor trusted by careful people. Break any single link and Flight 143 lands routinely in Edmonton, and no one ever hears the name Gimli. Accidents like this are almost never a single failure.

Why the Gimli Glider Still Matters

The enduring lesson is about the limits of automation. The most advanced jet of its era - glass cockpit, computers, the works - was ultimately saved by a captain who spent his Saturdays flying engineless aircraft. What brought 63 people safely to the ground was stick-and-rudder skill: a forward slip, an instinctive best-glide speed, and an airman flying by feel when the machinery had nothing left to give.

The day the automation quits and the cockpit falls quiet, the person in the left seat had better have done it the hard way at least a few times. Bob Pearson had.

Key Takeaways

• Air Canada Flight 143 ran out of fuel at 41,000 feet on July 23, 1983, after a liters-to-kilograms conversion error using 1.77 (pounds/liter) instead of the correct 0.8 (kg/liter) left the 767 with less than half its required fuel.
• Captain Bob Pearson’s glider experience was decisive - he flew the powerless jet at roughly 220 knots and used a forward slip to lose excess altitude on final.
• The crew diverted to Gimli, a former RCAF base turned drag strip, after determining Winnipeg was out of reach.
• Despite an unlocked nose gear and a crowded runway, all 63 aboard survived with only minor injuries and no one on the ground was hurt.
• The investigation found a chain of failures, not a single cause - and the aircraft flew for about 25 more years as the legendary “Gimli Glider.”