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Boeing Flags Additional 787 Production Problem

Boeing Co. said it had identified a third quality-control lapse in production of its 787 Dreamliner, further slowing deliveries of the jetliner and revving up an investigation by federal air-safety regulators.

The company said Tuesday that portions of Dreamliner tail sections made at a facility in Salt Lake City were clamped together improperly during assembly. The problem, affecting most Dreamliners, could lead to premature material fatigue of carbon-composite structures in the horizontal stabilizer, or rear winglike structure.

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