Summary
We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 737-300, -400, and -500 series airplanes. This proposed AD was prompted by a report indicating that the primary latch securing the passenger service unit (PSU) to the airplane structure is not adequate for the higher loads experienced during survivable accidents. This proposed AD would require installing lanyard assemblies on the PSU and, for certain airplanes, on the life vest panel. We are proposing this AD to address the unsafe condition on these products.