Brief Description: Building elevator counterbalance arms
Continuing the fitting of the ribs to counterbalance skin. Checked fit and readjusted rib fluting for better fit. Also figured out that the nut plates on E-615PP needed to be dimpled. Used rivet gun and back rivet plate with countersink hole to do the dimpling. Checked with factory before committing the dimples. They said that countersinking was not a good idea.
Matched drilled the ribs E-903 and E-904 for both sides.
