The Wing Box J-Channels are installed here on the Lower Flange of the Right Main Spar. As with the Left Spar, we marked off the holes that do not get match-drilled (at this time) with orange tape. We used a square again to make sure we had the 1/16” rise between the Main Spar Flange and the top of the J-Channel. It worked just as good on the Right Spar. (Note: Part 2 provides further details and pictures regarding how we used the square in this step)
As the plans instruct, we installed clecos in each hole as we completed the match-drilling down the length of the Spar. This is the completed Lower Flange, minus the holes covered by the orange tape. Once we complete the J-Channels on the Upper Spar Flange, we will “roll” the Lower J-Channel to the Upper Flange.....just like on the Left Spar. (Note: Part 2 provides further details and pictures regarding this step)
There is a lot of holes in these Spars. In the picture below, you can see the competed Upper/Lower Spar Flanges and J-Channel with all the clecos installed. The last step is to remove the Upper J-Channels, roll the Lower J-Channels (to the Upper Flange), and match-drill the remaining holes that were covered with the orange tape. Confusing I know, but it’s pretty straight forward when you actually do it.
Tomorrow, we will final-drill the several remaining holes (that weren’t match-drilled) in the Upper/Lower Flanges and all the nutplate attach holes. After that, the nutplate attach holes get countersunk.