July 29, 2007 - ELT Bracket, Fuel Pump, Spar Gussets
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I started the day with the ELT mounting bracket. This time I started
with the nutplates. They are pre-drilled -- inboard this time.
It occured to me that this was a perfect situation for back-riveting so
that's what I did. It's been a long time since I back-riveted, which
is probably the easiest, best quality type of riveting there is. |
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I drilled the bracket to the J-stringers.
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Then pop-riveted it. As always, the second time went much faster
than the first. Notice where I trimmed the bracket a little so that
the rudder cable wouldn't rub against it. I also put a piece of UMV
tape on the bracket. |
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Next step was to bolt the aux fuel pump to the firewall. I needed
to do this so I could fashion the fuel line that runs from the fuel
selector valve along the floor to the fuel pump. I tried making
the fuel line but the bend to the fuel pump was too short to be able
flare with the flaring tool. I tried flaring the end, and then
bending the tube, but that didn't work. After three tries I gave
up and ordered a 90 degree steel fitting from Spruce ($5) that will go
into the bottom end of the fuel pump.
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| The instructions never really said
when to drill these center spar gussets. Or if they did I never saw
it. Anyways, I figured I might as well do it now. I bolted the
gusset to the center spar using hardware store bolts, then match-drilled the
gusset side to #12 (for AN-3 bolts) using the fuse skin as a template.
There's quite a lot of aluminum to drill through there. |
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| All done. This is what it
looks from the outside. I also pop-riveted that hole to the lower
right with an LP4-3 per the drawings. |
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