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Fri, Mar 09, 2012

AD: The Boeing Company Airplanes

AD NUMBER: 2012-04-09

PRODUCT: Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP series airplanes.
SUBJECT: Airworthiness Directive 2012-04-09
ACTION: Final Rule

SUMMARY: This AD requires inspections for scribe lines in affected lap and butt splices, wing-to-body fairing locations, and external repair and cutout reinforcement areas; and related investigative and corrective actions if necessary. This AD was prompted by reports of scribe lines found at lap joints and butt joints, around external doublers and antennas, and at locations where external decals had been cut. The FAA is issuing this AD to detect and correct scribe lines, which can develop into fatigue cracks in the skin and cause sudden decompression of the airplane.

DATES: This AD is effective April 10, 2012.

FMI: AD

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