Editing Gimli Glider (section)

===Background===
On July 22, 1983, Air Canada Boeing 767 {{Airreg|C|GAUN|}} underwent routine checks in Edmonton. The technician found a defective FQIS, so he disabled the defective channel, and made an entry in the logbook. The next morning, Captain John Weir and co-pilot Captain Donald Johnson were told about the problem. Since the FQIS was now operating on a single channel, a dripstick reading was taken to obtain a second fuel quantity measurement. Weir converted the dripstick reading from centimetres to litres to kilograms, finding that it agreed with the FQIS. The plane flew to Toronto and then Montreal without incident.<ref name="final_report">{{cite web|author=Lockwood|first=George H.|date=April 1985|title=Final report of the Board of Inquiry investigating the circumstances of an accident involving the Air Canada Boeing 767 aircraft C-GAUN that effected an emergency landing at Gimli, Manitoba, on the 23rd day of July, 1983|url=http://data2.collectionscanada.gc.ca/e/e444/e011083519.pdf|access-date=January 9, 2016|website=Government of Canada}}</ref>

At Montreal, Captain Robert "Bob" Pearson and First Officer Maurice Quintal took over the airplane for Flight 143 to [[Ottawa]] and Edmonton. During the handover, Weir told Pearson that a problem existed with the FQIS, and Pearson decided to take on enough fuel to fly to Edmonton without refuelling in Ottawa. Meanwhile, an avionics technician had entered the cockpit and read the logbook. While waiting for the fuel truck, he enabled the defective channel, and performed an FQIS self-test. Distracted by the arrival of the fuel truck, he left the channel enabled after the FQIS failed the test. Pearson entered the cockpit to find the FQIS blank, as he expected.<ref name="final_report" />

The all-metric 767 aircraft, new to the fleet, tracked fuel quantities in kilograms.  After taking a dripstick measurement, Pearson converted the reading from centimetres to litres to kilograms. But he used the density figure for jet fuel from the Air Canada refueler's slip. This figure, used for all other aircraft in the fleet, stated the density in pounds/litre. The correct figure to use was for kilograms/litre, and the  result actually calculated was incorrect.<ref name="ASWEB" /> Since the FQIS was not operational, he entered the miscalculated result into the flight management computer. The airplane flew to Ottawa without accident, where another dripstick measurement was taken, and again, in the same way, converted incorrectly.  Since the aircraft appeared to have enough fuel to reach Edmonton, no fuel was loaded at Ottawa.<ref name="final_report" /><ref name="Deveau">{{cite news |last=Deveau |first=Scott |date=April 14, 2015 |title='Gimli Glider' pilot recalls heroic landing of Air Canada 767 as famed plane put up for sale |url=http://news.nationalpost.com/news/canada/gimli-glider-pilot-recalls-heroic-landing-of-air-canada-767-as-famed-plane-put-up-for-sale |newspaper=National Post |location=Toronto, Ontario, Canada |access-date=January 9, 2016}}</ref>