Summary
We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 737-100, -200, -200C, -300, -400, and -500 series airplanes. This proposed AD was prompted by reports of fatigue cracking in certain areas. This proposed AD would require repetitive inspections for cracking of the skin assembly and bear strap of the forward airstair stowage doorway; post-repair and post- modification inspections for certain airplanes; and related investigative and corrective actions, if necessary. This proposed AD would also provide optional terminating actions for certain repetitive inspections. We are proposing this AD to detect and correct fatigue cracking, which could result in rapid loss of cabin pressure.