Airworthiness Directives; The Boeing Company Airplanes

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We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. This proposed AD was prompted by significant changes made to the airworthiness limitations (AWL) related to fuel tank ignition prevention and the nitrogen generation system. This proposed AD would require revision of the maintenance or inspection program, as applicable, to include the latest revision of the AWLs. We are proposing this AD to address the unsafe condition on these products.