Match drilled the F-772 bottom skin - 2.5 hours

Thinking on what to do next, I figure at some point I need the get the F-772 bottom skin in place. And right now seems like a good time.

Before I started, I felt it wise to drill a couple keeper holes to aid in getting the skin fitment correct.
I choose the #40 holes towards the aft ans one of the #30 holes.

Then I began to drill all the holes. This included the holes being drilled through the lower engine mount. I was concerned about the edge distance here as there is very little room to work with. But as you can see a do have enough edge distance. In fact the blue line is drawn at 0.225" rather than minimum edge distance at 0.219" just for a bit extra.


All of the holes drilled and the floor skin is cleco'd