Pg. 15-3 Step 8: Riveted the Rib Doublers to the L Main Ribs. Step 9: Riveted the Rib Doublers to the R Main Ribs. Pg. 15-4 Step 1: Clecoed and riveted an R Main Rib to the outboard attach angle on the L Spar Assy. Step 2: Clecoed and riveted a match drilled R Main Rib to the next attach angle. Step 3: Clecoed and riveted four more R Main Ribs. Step 4: Clecoed and riveted the other match drilled R main Rib to the attach angle. Step 5: Clecoed and riveted five more R main Ribs to the Spar Assy. Step 6: Clecoed and riveted the L Main Rib with the Rib Doubler to the last attach angle. Step 7: Clecoed the Aft Spar Assy. to the Main Ribs. Step 8: Match drilled the two #30 holes into the aft flange of the inbd L Main Rib. Removed and deburred. Step 9: Clecoed and riveted the Aft Spar Assy. to the Main Ribs.
