The Gimli Glider, Captain Bob Pearson's Dead-Stick Sideslip Onto a Drag Strip After Air Canada Ran a Boeing 767 Out of Fuel at Forty-One Thousand Feet

On July 23, 1983, Air Canada Flight 143 - a nearly new Boeing 767 - ran completely out of fuel at 41,000 feet over Ontario with 161 people aboard. Captain Bob Pearson, an experienced glider pilot, flew the powerless 132-tonne jet to a dead-stick landing at a former air force base at Gimli, Manitoba, using a basic stick-and-rudder maneuver called the forward slip. Everyone survived, and the aircraft became known forever as the Gimli Glider.

What Caused Air Canada Flight 143 to Run Out of Fuel?

The root cause was a unit-conversion error, made worse by a broken instrument. The 767’s fuel quantity processor was faulty, so the ground crew in Montreal measured the fuel the old-fashioned way - dipping the tanks with a stick and calculating the load by hand.

The problem was that Canada was converting to the metric system, and this 767 was one of the first Air Canada aircraft to measure fuel in kilograms rather than pounds. To turn a volume in liters into a weight, you multiply by a figure called specific gravity.

The correct metric figure was roughly 0.8. Out of habit, the crew reached for 1.77 - the pounds-per-liter number. The math told them they had far more fuel than they did.

They loaded roughly half of what the flight from Montreal to Edmonton, via Ottawa, actually required. Every step was signed off, and the jet taxied out to cross half a continent on a tank that would soon read empty.

What Happened When Both Engines Failed at 41,000 Feet?

Cruising over Ontario, the crew heard a warning tone for low fuel pressure on the left side. Assuming a failing fuel pump - a nuisance, not an emergency - they began considering a diversion to Winnipeg.

Then the right side chimed. Moments later, the left engine spooled down, and about a minute after that, the right engine went silent too. No airline crew in 1983 had trained for a total fuel exhaustion at altitude; the checklist for it essentially did not exist.

With both engines dead, most of the 767’s glass-cockpit displays went dark, because the engines generated the electrical power. A small emergency turbine - the Ram Air Turbine (RAT) - deployed into the slipstream and restored just enough hydraulics and electrics to keep basic flight instruments and controls alive.

What Pearson did not have was thrust, a checklist, or a published best-glide speed. No one had ever calculated a glide speed for a Boeing 767, because a jetliner was never expected to fly without engines.

How Did Captain Pearson Glide a Powerless Jetliner?

Pearson fell back on his weekend flying. As a sailplane pilot, he understood energy management by feel. He settled the nose on a speed that kept the aircraft flying while stretching its range, trading altitude for distance exactly as a glider pilot would over a ridge.

Meanwhile, First Officer Maurice Quintal worked the numbers on where they could land. Winnipeg was out of reach - they were sinking too fast. Then Quintal remembered a field from his Royal Canadian Air Force days: a former military strip at Gimli, north of Winnipeg, off to the side and within gliding range.

What the crew could not have known was that the old runway had been converted into a motorsport park. That Saturday it was crowded with race cars, campers, and families - a race meet was underway on the very concrete Pearson was aiming for.

How Do You Do a Forward Slip, and Why Did It Save the Landing?

On final approach to Gimli, Pearson was too high and too fast. In a glider, being high is the harder problem - you cannot add power to climb out of it, and you cannot simply wish the excess energy away. He needed to lose a lot of altitude without gaining airspeed, on a runway shorter than he wanted and with people on it.

He reached for the forward slip, a maneuver taught in the first dozen hours of flight training:

1. Apply full rudder in one direction to yaw the nose off the flight path.
2. Apply opposite aileron to hold your track down the runway centerline.
3. Cross the controls so the fuselage flies partly sideways through the air, turning the whole airframe into a giant speed brake.
4. Bleed off altitude rapidly while airspeed stays under control.

Pearson slipped a 132-tonne airliner. Witnesses on the ground described the big jet cocked over sideways, dead silent, dumping altitude like a light aircraft settling into a farm strip. He straightened her out at the last moment for touchdown.

How Did Everyone Survive the Gimli Landing?

With the engines gone, the normal system that powers the landing gear down was unavailable. The crew performed a gravity drop, letting the wheels fall and lock under their own weight. The main gear came down and locked, but the nose gear fell only partway and did not lock.

The aircraft touched down mains-first, hard, near the end of the strip. Pearson stood on the brakes hard enough to blow two tires. The unlocked nose gear folded back under the aircraft, dropping the nose onto the concrete in a shower of sparks.

That failure became an asset: the nose grinding on the pavement added extra braking on a runway that was far too short, with a crowd ahead. The aircraft slid to a stop.

A small fire broke out in the nose area, and the racers on site extinguished it with the hand-held fire extinguishers from their own cars. No one aboard or on the ground was seriously hurt. The only injuries were minor - passengers exiting from the rear, where the tail sat high with the nose down and the escape slides came up short.

What Can Pilots Learn From the Gimli Glider?

An official inquiry - documented in the Canadian Aviation Safety Board report - traced a chain of failures: the metric changeover, the broken fuel gauge, the specific-gravity error, ingrained habits, and the paperwork. Pearson and Quintal took criticism in the immediate aftermath, though the outcome speaks for itself.

A captain brought a powerless jetliner down from the flight levels with no thrust, no published glide speed, and a runway full of people, using a slip he likely first learned in a tailwheel trainer. His first officer produced a runway that appeared on no flight plan by drawing on his own past.

The lesson for student pilots is that the maneuver that saved the day is not exotic. The forward slip is core stick-and-rudder work you will practice over a short grass strip. On the worst day of Pearson’s career, the fundamentals were exactly what he had left. Both men eventually returned to flying, and Pearson remained a glider pilot for the rest of his life.

Key Takeaways

• Air Canada Flight 143 ran out of fuel at 41,000 feet on July 23, 1983, caused by a specific-gravity unit error (1.77 lb/L used instead of ~0.8 kg/L) that left the 767 loaded with about half its required fuel.
• Captain Bob Pearson’s glider experience let him fly the 132-tonne jet with no engines and no published glide speed, while First Officer Maurice Quintal identified Gimli as a reachable runway.
• Pearson used a forward slip - a basic training maneuver - to dump excess altitude on short final, then landed with an unlocked nose gear that collapsed and aided braking.
• All 161 people survived, with only minor injuries; ground crews and racers helped extinguish a small nose fire.
• The event proves that fundamental stick-and-rudder skills can matter as much as advanced systems knowledge in an emergency.