Airworthiness Directives; Boeing Model 737-100, -200, -200C, -300, -400, and -500 Series Airplanes

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The FAA proposes to adopt a new airworthiness directive (AD) for certain Boeing Model 737-100, -200, -200C, -300, -400, and -500 series airplanes. This proposed AD would require repetitive inspections to detect cracking of the body station 303.9 frame, and corrective action if necessary. This proposed AD also provides for optional terminating action for the repetitive inspections. This proposed AD results from reports of cracks found at the cutout in the web of body station frame 303.9 inboard of stringer 16L. We are proposing this AD to detect and correct such cracking, which could prevent the left forward entry door from sealing correctly, and could cause in-flight decompression of the airplane.