Again some work on the main bulkhead. First I primed the countersunk holes, then I riveted the nutplates and installed the bushings. Then, two sapcers have to be fabricated from aluminium tubing. I always cut them a bit long, then get them to the correct length by using the drill press and some abrasive paper.



Then I tried to install the control columns. I have some problems figuring out how all will have to work, it looks like the aileron bellcrank, but I think I'll have to adjust the parts to get it work correctly.

Today, I worked on the main bulkhead. First I backdrilled into position the four rib supports on the forward side. As there are some nutplates ont the bulkhead, I countersunk the rivet holes.



There are also nutplates on the supports, and on the two stiffeners I made out of some aluminium angle.



There is some interference on some of teh bushing. My solution was to carefully saw a slit in the bushing and then install the interfering part.



Then I installed the angles that will support the control column on the backside of the bulkhead.



The I cut the optionnal lightening cut, here is the result.
I finished the session by deburring all the parts.

Today I begin working on the main bulkhead, its a massive assembly that got delivered with the wings as it is paired to the mains spars. The spars will be bolted to this bulkhead, as well as the control column assembly.
To begin I drill all the holes that will get snap-bushings installed.



Here is the complete bulkhead.



The two shear bars have to be backdrilled, the holes got coutersunk to allow the wing spar to be flush-installed.



I then drill the four supports, the size of each hole is different to allow for the proper snap bushing.

One hour was needed to deburr all the parts, tomorrow I'll begin working on the main bulkhead.

Some more work on the seatback bulkhead. First I drilled the flaps mechanism supports on the drill press.



Then I coutersunk all the holes that will get countersunk rivets. I then trimmed the seat belts anchors, some are interfering with the floor ribs.




I finished the day by deburring some parts, I'll finish the remainder tomorrow.