Summary
The FAA proposes to adopt a new airworthiness directive (AD) for all The Boeing Company Model 737-100, -200, -200C, -300, -400, and -500 series airplanes. This proposed AD was prompted by a report of a fuel leak resulting from a crack on the left in-spar upper wing skin. This proposed AD would require repetitive surface high frequency eddy current (HFEC) inspections of the left and right upper wing skin, and repetitive general visual inspections of the upper wing skin in the adjacent rib bay areas for any crack, and applicable on-condition actions. The FAA is proposing this AD to address the unsafe condition on these products.