The Seattle Times, "Boeing appeals redesign rule"

          Boeing wants to be exempt from a U.S. rule that may require the plane maker to redesign Pratt & Whitney engine-control systems in some 757s because of malfunctions.
          The systems malfunctioned five times in the first 4 million flight hours of 757-200 jets when the engines produced more or less force than pilots sought, Boeing said in a U.S. Department of Transportation filing. Pilots did control the planes and stop the engines in the incidents, which occurred more than six years ago, Boeing said.
          The Federal Aviation Administration (FAA) asked Boeing to take the malfunctions into account when installing the system on 757-300 planes. An FAA rule requires that manufacturers show no single failure or malfunction, or combination of failures, will jeopardize safe operation.