My EFII ignition and fuel system needs a number of fuses and where to put them has been on my mind for a couple of years. I’ve decided on the inside of the right armrest.

Sounds nuts… I can mount these in such a way that they will not interfere with my throttle arm resting there and I will be able to reset them or pull a fuse if I need to.

The wires need to be clear of my control push rods yet still maintainable. While the pic shows the fuse horizontal, I’m going to line them up vertically. Each fuse will get two wires and I’ll be able to get to them without removing the whole bank. There will not be a common ‘bus’ for the +ve either. Too much risk of a short with such a long live area.

The idea is that I mount this aluminium angle exactly below the armrest. This way the arm rest can be removed without disturbing the fuses.

The fuses when depressed will sit level with the top of the armrest and so pose no comfort issue. When they pop I should feel it. I will have some foam on the armrest anyway for flying comfort. It took several goes to then make a hole that I could get my fingers into if I ever need to full a fuse manually.  I settled on an oval shape.

Next were a set of nutplates to hole the angle. I also had several thoughts on how many fuses I could fit and what orientation they might be (again).

Here are the nutplates and angle ready to be floxed into position.

I just dug out the fuselage wall to make a place for the hardpoint nutplates.

After flox it was just a matter of fitting the well duct taped angle. I screwed the armrest into position too.

After cure I went for one ply of BID over the plates to tie them into the wall. Of course a little peel ply is easy to transition the glass.

Here’s the resultant angle filed with the four screws (hidden in the pic) to the wall. All good.

Next up was drilling 12 holes in a straight line – always a challenge for me.

Here I’ve opened the holes up for finger access to the fuses if its needed.

Finally the fuse bank holder in place. and the armrest installed too. I only have one spare fuse now for sizing things. I need 7 fuses at a minimum for the EFII system. Having another 5 spots should be handy. I don’t know if I’ll need them as I’m yet to do the required wirebook for the plane.