Overlooked Safety Checkup Grounds United’s Boeing 757 Fleet

United Airlines grounded its entire fleet of Boeing 757 jets Tuesday night after the carrier discovered that it had failed to carry out a federally-mandated safety checkup of on-board equipment.

As USA Today reports, the problem involves  air data computers in the 96 planes, which were ordered replaced by the Federal Aviation Administration in 2004 because of a tendency to give incorrect data to pilots about air speed. United replaced the computers as directed, but did not perform follow-up work on the new machines.

Upon realizing the oversight, United announced the grounding. The planes can hit the runways once more after receiving the necessary checkup, which lasts 60 to 90 minutes per plane and which were expected to be completed Wednesday.

“We are using all available resources to address this issue,” a company spokeswoman said.

Problems with air data computers have been connected to crashes. In two deadly accidents in 1996 — one involving an AeroPeru aircraft that crashed near Lima and another involving a  Birgenair jet that went down off the Dominican Republic — faulty readings led pilots to think that they were flying too fast. Investigators have also said that the air data readings were incorrect on the Air France flight from Brazil that crashed into the Atlantic Ocean in 2009.

Company officials said that the same planes flown by Continental Airlines, which also is owned by United Continental Holdings Inc., are not subject to the grounding.

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