Cleco'ed the F-1237B, F-1237D, and F-1237C-L & -R to the F-1237A, this is the Seatback Assembly. Final Drilled #12 the two holes in both lower corners of the Seatback Assembly for the indicated bolts. Disassembled the Seatback Assembly and debured the holes. Re-cleco'ed and then riveted the parts using AN470AD4 rivets as called out in figure 2 page 25iS/U-04.
Bolted the F-00120-R and F-00121-L to the lower corners of the Seatback Assembly using 2 AN3-4A and 2 AN3-5A bolts 4 NAS1149F0363P washers and 4 MS21042-3 nuts per figure 2 same page. Cut a 14 1/2 inch length from one of the hinge pins. Measured in 1 inch and created a 90 degree bend per figure 2 page 25iS/U-05 and filed the opposite end to a rounded dull point. Attached the Seatback Brace Assemblies to the aft side of the Seatback Assemblies by inserting the hinge pin through both halves of the F-1237F per figure 1 same page. Secured the bent end of the hinge pin using safety wire as shown in the detailed view of figure 1.
Inserted the F-00098 partially through the F-00120-R, slid the SPRING-00004 and washer, then inserted the F-00098 completely through the F-00120-R. Compressed the spring with the washer and then secured the F-00098 using the MS24665-132 cotter pin per figure 2 page 25iS/U-06. Repeated for the left side.
Installed the Left and Right Seatback Assemblies as shown on Page 25iS/U-01.
