What was found
WHILE REPLACING REAR PX SEATBELTS, IT WAS DISCOVERED THAT REINFORCEMENT PLATE HAD BEEN INSTALLED ON FWD SIDE OF AFT SEAT BLKHD UNDER SEATBELT ATTACH BRACKET. (-6) PLATE SHOULD HAVE BEEN INSTALLED ON AFT SIDE OF BLKHD IAW AGAG DWG 5102299. MS203641032 (THIN SHEER NUT) WAS USED TO SECURE AN3-5A RETAINING BOLTS. NUTS SHOULD HAVE BEEN INSTALLED IAW DWG. RESULTS IN REDUCED SEATBELT ATTACHMENT STRENGTH COMPARED WITH DESIGN CONFIGURATION. AC APPEARED TO HAVE ORIGINAL SEATBELTS INSTALLED, THIS IMPROPER INSTALLATION WAS ACCOMPLISHED DURING ASSY. REAR SEAT SEATBELT OB ATTACH BRACKETS INSP FOR PROPER INSTALLATION OF PLATE AND PROPER ATTACH HARDWARE PRIOR TO CARRYING REAR SEAT PASSENGERS. (EA07200502731)(K)