Brief Description: Drill Holes in the Root Rib for the Main and Retur
Refined the hole in the Lower Wing Skin for the Main Tank Sump Drain Boss. Used clay and awl, as per the method used in step 54, to determine position of main and return fuel line bosses with relation to root rib. After drilling pilot hole, used 7/8" and 1" hole saw in drill press to create holes for main and return fuel line bosses.
