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Old 12-28-2015, 07:11 PM
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Join Date: Jul 2002
Location: ames, IA
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Four key parts of the firewall:

1) flange for front of nacelle
2) smaller flange that glues to the back of #1 to give nacelle planking something to hold on to. Made of light ply and exactly 1/8" smaller than #1 all the way around
3) 1/4" aircraft ply firewall
4) 1/8" aircraft ply cowl ring. Bolts on to firewall to hold cowl on and allow easy accessibilty
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