Summary
We propose to adopt a new airworthiness directive (AD) for all The Boeing Company Model 737-100, -200, and -200C series airplanes. This proposed AD was prompted by a report of incidents involving fatigue cracking in transport category airplanes that are approaching or have exceeded their design service objective and a structural reevaluation that was conducted by the manufacturer. We have determined that supplemental inspections are required for timely detection of fatigue cracking for certain structurally significant items (SSIs). This proposed AD would require revising the maintenance or inspection program, as applicable, to add supplemental inspections. This proposed AD would also require inspections to detect cracks in each SSI, and repair of any cracked structure. We are proposing this AD to address the unsafe condition on these products.