After the panel was riveted, we finished attaching the fiberfrax to the firewall:
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| Firewall fully covered with Fiberfrax, minus penetration openings |
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| Adding sealant to the Fiberfrax for attaching the titanium foil |
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| Spreading the sealant in the firewall recess for attaching the titanium foil |
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| Firewall fully covered with titanium foil, after initial edge sealant application |
When applying sealant to the edges of the titanium, we actually made a big mess which will require significant cleanup and then sealing it up again in some parts, before reattaching the engine mount.
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| Messy sealant application which will need to be cleaned up |
We then opened up all the same firewall penetrations through the titanium foil, which had to be done mostly with a carbide carving bit, and being very careful not to eat up the firewall steel. We also riveted the titanium to the firewall where the titanium sheets overlap:
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| Firewall titanium foil riveted in place |
As the last remaining step from section 27 (Firewall), I also attached the heat valves to the firewall:
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| Heat valves installed in place, with sealant around their edges |
And finally, we riveted the wire passthrus on both sides:
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| Firewall with heat valves and wire passthrus attached |
Next we'll finish cleaning up the sealant on the firewall, and then we'll start actually getting ready to hang the engine for real.
Total engine mount and landing gear rivets: 14
Total engine mount and landing gear time: 44.2h
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