Cut out the foam ribs and clamping "V" blocks. Modify the E-917 and E-918 trim tab horns Drill, dimple and rivet the trim tab horns to the bottom of the trim tab skin. Complete the trim tab trailing edge bend Bend the end tabs to close the trim tab inboard and outboard ends. Cleco, drill, deburr, and dimple the skin and spar. Rivet the trim tab spar lower flange to lower surface of the trim tab skin. Insert the ribs into the trim tab at the proper locations. Cleco the trim tab skin to the trim tab spar and hinge. Slip clamping V-blocks on to the trim tab directly over the rib locations to squeeze the skin tightly to the ribs. Set the rivets in the trim tab spar and hinge. Set the blind rivets in the ends of the trim tab, Drill through the elevator into the trim tab hinge and cleco as you go. Remove the trim tab, pull the pin and rivet the hinge half to the tab spar on the elevator. Bend the trim tab hinge pin.
