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Thu, Nov 03, 2011

AD: Boeing 737-300 -400 -500

AD NUMBER: 2011-23-05

MANUFACTURER: The Boeing Company Model 737-300, -400, and -500 Series Airplanes
SUBJECT: Airworthiness Directive 2011-23-05
ACTION: Final rule; request for comments.

SUMMARY: The FAA is superseding an existing airworthiness directive (AD) for certain Model 737-300, -400, and -500 series airplanes. That AD currently requires repetitive inspections for cracking of the 1.04-inch nominal diameter wire penetration hole, and applicable related investigative and corrective actions. This AD reduces the compliance times for those actions. This AD was prompted by reports of cracking in the frame, or in the frame and frame reinforcement, common to the 1.04- inch nominal diameter wire penetration hole intended for wire routing; and recent reports of multiple adjacent frame cracking found before the compliance time required by the existing AD.

Such cracking could reduce the structural capability of the frames to sustain limit loads, and result in cracking in the fuselage skin and subsequent rapid depressurization of the airplane. The FAA is issuing this AD to correct the unsafe condition on these products.

DATES: This AD is effective November 16, 2011.

FMI: AD

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