*****Work during this session was completed on Friday, March 22, 2019*****
Today’s session was spent working on the F-01404 Aft Center Section Bulkhead. To start, the #30 and #40 holes in the bottom flange had to be machined countersunk to fit a dimpled .032 Skin. I used my .032 thick template with a dimpled #40 hole as a guide for the correct countersink depth. To hold the Bulkhead in place while I countersunk the holes, I clamped the Upper Flange to my workbench as shown below. This allowed a somewhat steady base to complete the countersinking.
Here are examples of the #30 and #40 holes after being countersunk. I put the orange tape on the Bulkhead to prevent pieces of aluminum shavings from getting in the seam. I learned this lesson earlier when working on the Wing Spar. Some of the little shavings are very difficult to remove once they are in the seam. The tape keeps this from happening.
The next step was to countersink the #40 holes in the Upper Flange of the Bulkhead to fit the head of an AN426AD3 rivet. These rivets will be attaching nutplates to the flange. Here are three of the nutplates locations with the countersunk #40 holes.
The last step for today’s session, was to countersink the two #40 holes in the F-01404D-L & -R Side Angles. Here are both of the Angles (-L on top and -R on the bottom).....
.....and a close up of the two countersunk holes on the -R Side Angle.
