Finished applying zinc chromate to the nose ribs, spar doubler, and angle brackets for the left wing nose ribs. Riveted and bolted them in position according to the drawing 6-ZU-1. De-burred rivet holes drilled between existing rivets on top and bottom of the spar. Extra rivets required by SAIB Upgrade on drawing 6-ZU-4. Set the rivets on the bottom of the spar. Riveted nose ribs to the bottom of the leading edge skin.
