Fuel Selector Valve Bracket
I squeezed the rivets on the Selector Valve Bracket …
… and on the Routing Channel.
Attaching Forward Center Section Bulkhead Assembly
The Bulkhead Assembly fitted nicely overall.
I found that the left side needed a gentle tweak of the lower skin to align all the rivet holes perfectly. Probably caused by splay on the rear tunnel.
We slid the assembly over the edge of the bench to give access for riveting the Cover Panel Ribs to the lower skins from underneath.
The rearmost rivet of each rib is NOT set to allow the mid section to be inserted later.
A fellow riveter makes all this a lot easier! Cover Base rivets bucked.
We managed to set the Tunnel Side AN470AD4-5’s with the Manufactured head on the side flanges by using the long rivet set.
Lots of nut plates to attach, with very restricted access and visibility.
We taped a spacer on the bucking bar used for the top nutplates to make it safer to position the bar without impinging on the nut plate thread area itself … it’s just hard to see the positioning without a mirror etc.
The specified rivets for the top flanges seemed a little short … so we used -3.5’s.
The Vent Assembly attachment went easily.
I used as low a pressure as possible for riveting on the Firewall to prevent distortion.
Left and Right brackets are orientated the same … ie they are NOT mirrored.
I managed to squeeze 3 of the 426 bottom rivets on each side in the battery box, but couldn’t reach the last ones in the very corner.
But Tim had a moment of inspiration … we used the bucking bar that was used on the elevator.
We clamped it in a vice and then back-riveted the flipping thing. Worked a treat!
There was enough flex in the box to allow a mushroom set on the top & side rivets, but had to back-rivet the bottom ones …
… by using a couple of Tungsten Bucking Bars.
So that’s it, Section 28 all done!