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Production mistakes on scores of Boeing 787s will intensify scrutiny of the manufacturer’s quality-control capability and could place it in violation of a 2015 agreement with the FAA triggered by other manufacturing problems, including some on the 787 program.

Boeing has discovered two seemingly unrelated defects introduced in composite fuselage sections during 787 production. A source with knowledge of the issues confirms the more prevalent issue involves shims, or material added during assembly to fill gaps between structures or adjust how pieces fit together to ensure tolerances are met.

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