Friday, September 29, 2023

Fuselage center section #48 - Fuel Lines!

Finished up the second of the two long fuel lines.  This one goes from the bypass assembly to the fuel filters.

 

First bend compete.


This bend is off plane to the first bend.  This allows the tube to be at the same angle as the rear bulkhead relative to the tube path.


Next three bends are claimed to be in the same plane per the templates but this cannot be true.  All three bends are on a different plane.  While the 3D model is technically correct, the notes are not.  Also there are not enough details provided to accurately make this tube per the model.  There is more guess work required than necessary to make this tube.  Is it doable?  Yes, but it could be so much easier if these directions were tweaked.


Last bend done!


The long end gets inserted into the center channel.  Just have to work the tube through all the bushings and tweak as necessary to get it all the align.  Watch the end of the tube, it will scratch the bottom skin if you don't take precautions.

I mocked up this area to simulate what I will end up with to ensure the fwd end of the tube is cut correctly.


Tube running through the center channel.

And through the systems guide blocks.


Marked the tube + 0.100" at the end of the bypass fitting assy.  Used the close quarters tubing cutter to cut the tube.


Don't forget to install the bushing and the nut!


And to deburr the inside diameter of the tube!



All done after the flare!  Having the bottom skin loose at the from was key to making this doable!





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