Summary
We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 747-400 airplanes. This proposed AD was prompted by reports of fasteners missing on an airplane undergoing a passenger-to-freighter conversion. This proposed AD would require doing a general visual inspection of the station 1920 splice clip for correct fastener installation, and related investigative and corrective actions if necessary. We are proposing this AD to detect and correct missing or incorrect fasteners, which can lead to cracking and loss of load carrying capacity, resulting in a possible decompression event.