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Mon, Oct 06, 2014

AD: Lockheed Martin Aeronautics Company Airplanes

AD NUMBER: 2014-20-08

PRODUCT: Certain Lockheed Martin Corporation/Lockheed Martin Aeronautics Company Model L-1011 series airplanes.

ACTION: Final Rule

SUMMARY:  This AD was prompted by reports of cracked rib cap castellations.

This AD requires repetitive inspections for castellation and skin clips cracked or damaged between stringers and cracked stringer clips of the wing box pylon back-up structure, and front spar to rear spar; repetitive inspections for cracking, damage, or failure of the pylon back-up torque box structure; repetitive inspections for cracking or damage of the wing box external areas at the drag brace aft wing fitting; repetitive inspections of the outer surface of the wing upper and lower skins for cracks or damage along the rib attachment at the fastener holes and between the two rows of attachment; and corrective actions if necessary.

The FAA is issuing this AD to detect and correct cracked or damaged rib cap castellations, which could degrade the structural capabilities of the airplane.

DATES: This AD is effective November 7, 2014.

FMI: AD

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