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A computer breakdown caused a United Continental Holdings Inc. (UAL) flight to take off earlier this year about 20,000 pounds (9,071 kilograms) heavier than pilots believed, prompting the carrier to add extra checks to ensure accurate weight calculations.
United sent pilots a weight estimate that assumed the coach section of the Boeing Co. (BA) 737-900 was empty when it was full, according to three people familiar with the incident who asked not to be named because they weren’t authorized to speak about it.
While the pilots, who didn’t catch the mistake, had difficulty getting the jetliner airborne, the plane wasn’t damaged and the flight was completed without incident, one of the people familiar with the event said. The pilots reported the trouble to a United program that encourages employees to identify safety issues, according to another person.
http://www.businessweek.com/news/20...-takeoff-on-computer-glitches-prompts-changes