At 105ft (32m) long the Boeing 777X's spars are the largest single-piece carbon fibre reinforced plastic (CFRP) composite parts ever developed for an airliner. Along with the wing's panels, the spars are produced at the new Composite Wing Centre (CWC) that Boeing has built specifically for the 777X at the Everett home of the Triple Seven. The CWC produces four spars (front, rear, right and left) and four panels (upper, lower, right and left). Another factory, Boeing Fabrication in St Louis, Missouri, supplies the wing's leading and trailing edges, ribs and folding tips.
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