Boeing and inspectors have discovered micro-cracks on some Boeing 787-800 and 900 Dreamliners in shear-ties of wing ribs at its assembly plants in Washington state and in South Carolina.  Despite the discovery and repair needed, Boeing said it does not expect any delays of the 110 Dreamliner due for delivery in 2014.

Mitsubishi Heavy Industries, the wing’s manufacturer, discovered the cracks and is working with Boeing on repairing the affect planes.  The fault appears to affect only certain wings that were made with a new manufacturing process.

Initial designs failed to account for thermal fatigue loads on aluminum parts.  The Wall Street Journal reports the cracks to affect planes 151 through 193.

Of those, planes 181and 186 are destined for United Airlines.

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