As a result, the plane had less than half the required amount of fuel on board. Trouble is, while the 767 aircraft measured fuel in kilograms per liter (kg/L), the density figures in the refueling guide used pounds per liter (lb/L). ![]() That amount of fuel was then pumped into the aircraft. Calculating that the plane needed 8,703 kg of fuel, they divided that by 1.77 - the density of the fuel according to the refueling company’s documentation - to convert the kilograms to 4,916 L. When the aircraft’s fuel quantity indication system failed prior to takeoff, the flight and ground crews decided to manually compute the amount of fuel required. Miraculously, only two passengers sustained minor injuries - and that was while evacuating the aircraft. Some Worst-Case Scenariosīack in 1983, an Air Canada Boeing 767 flying from Montreal to Edmonton ran out of fuel about an hour into its flight and had to (literally) glide in for an emergency landing. ![]() In fact, the risks of moving back and forth between metric and standard measurement systems is the stuff of legends, often having disastrous results. It’s a task that is not nearly as simple as you may think. One of the fundamentals of small parts sourcing is the ability to convert between different units of measurement - for example, creating a metric tolerance chart by converting tolerance figures between millimeters and inches. The Surprising Complexities of Conversion
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