25-02: Mid Fuse Bulkhead side channels

[TASEsq]

Hi brainstrust,

On page 25-02 we are riveting the mid fuse bulkhead lower channel to the left and right side channels and their doublers. The doublers extend above the lower channel with a couple of lines of rivets.

Step 4 calls to rivet the side channels and the doublers to the lower channel. It does not specifically state to rivet the 2 lines of rivets which connect the doublers to the side channels only (I.e. above the lower channel). These however have rivet callouts on 25-02.

So I assumed these were supposed to be riveted now, but wanted to check I was not missing something? They would be hard to drill out later.

I can’t find any reference to these rivets on any other sections of the build manual.

As a side note, these rivets would he hard to set once the side channels were riveted to the lower channel, so I have done them first. I also placed the manufactured head forward as these will be seen from the cockpit (the instructions call for the doubler rivets to have the manufactured head aft - but I am not sure why).

 

[AlexC]

I riveted them at the same point (see pic), and that was fine - and the correct thing to do. I know of someone who didn't rivet them at this point, and it was very difficult to rivet them later. I'd guess there is a discrepancy in the plans since I remember having a similar doubt at the time.

_Alex

 

[mc607]

Yes, rivet them now but step 4 says to put manufacturered heads on aft side. Not sure why but when they specifically say that, there’s a reason. Heads up, when you get to 29-03 there should be a similar note to use temporary nuts on everything you bolt up because you’ll have to remove it to access rivets on the next page.

 

[TASEsq]

Cool!

Thank you for the sanity check.

The 3 rivets in front of these on the flange of the lower channel are floor pan rivets and are pull rivets - should be easy to get to with the manufactured head forward.

I’ll do the lower rivets on those doublers as per the plans - manufactured head aft.