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Bobs Ten
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Date:  1-12-2018
Number of Hours:  1.90
Manual Reference:  
Brief Description:  Heating Duct Bypass

1724 - 1918

Fabricate mount for cabin heat bypass valve.

I decided to design a bypass system for the cabin heat to keep the hot air from heating the firewall and tunnel area when not in use (heat valves closed). I am using 2" Y valves that were available from ACS. This will allow me to dump the heat from the muffs overboard before it gets to the firewall.

I used a piece of 063 aluminumsheet for the mount. It bolts to the sump at the aft two bolts. The mount it bent around the Y and riveted in 4 places. A layer of high temp RTV was applied between the Y and the mount prior to riveting.

Most time today was spent determining the location of the valve.
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