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Wed, Mar 11, 2009

AD: Boeing

AD NUMBER: 2009-02-06
MANUFACTURER: Boeing
SUBJECT: Airworthiness Directive 2009-02-06
SUMMARY:
We are adopting a new airworthiness directive (AD) for certain Boeing Model 737-300, -400, and-500 series airplanes. This AD requires repetitive high frequency eddy current inspections for cracking of the 1.04-inch nominal diameter wire penetration hole in the frame and frame reinforcement, between stringers S-20 and S-21, on both the left and right sides of the airplane,and related investigative and corrective actions if necessary. This AD results from 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. We are issuing this AD to detect and correct cracking in the fuselage frames and frame reinforcements, which 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.

FMI: www.faa.gov/regulations_policies/airworthiness_directives/

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