0.63" to 0.94" spacing two evenly staggered rows at 0.55" minimum pitch Nose rib Repair plate 0.50 R minimum (typical) Rib access hole in nose beam Nose beam Doubler 0.35" minimum edge margin 0.38" - A A 2.80" minimum 2.80" minimum 3.0" minimum 3.0" minimum 11.60" min. 0.25" 4.8" 0.06" R A A Use AN470 or AN456 AD3 or equivalent Cherry self-plugging CR-163 rivets Damaged portion  cut-away 6.00" maximum Original structure Repair parts Repair parts in cross section Patch to be 0.016" 24S-T4 ALCLAD Filler strip 0.016" 24S-T4 ALCLAD Replacement section of trailing edge strip 0.032 " 24ST4 ALCLAD 0.60" minimum 1.25" 0.8" 15° 0.60" minimum 0.70" 0.70" 0.70" 0.70" 0.40" 0.40" 5.00" maximum 0.9" 0.9" 0.9" 0.9" Bottom skin Figure 4-192.  Leading edge repair. Figure 4-193.  Trailing edge repair.  4-110