N9434V Posted September 7, 2019 Report Share Posted September 7, 2019 Picture from Right Instrument panel on a 1970 M20. in the center of the picture just above the numbers is an open tube, it is one of two tubes that open into the right side scoop just in front of the door. One tube has a clear tubing that runs toward the rear of the radio stack the other is just open. Should something be on the other tube? Dennis Quote Link to comment Share on other sites More sharing options...
N201MKTurbo Posted September 7, 2019 Report Share Posted September 7, 2019 (edited) They were for cooling the radios. Most people don’t use them anymore because they can fill your expensive avionics with water if you fly through the rain. You can put hoses on them and direct them near the radios to cool behind the panel or just cap them off. Edited September 7, 2019 by N201MKTurbo Quote Link to comment Share on other sites More sharing options...
Guest Posted September 7, 2019 Report Share Posted September 7, 2019 Those are water delivery systems for your avionics! Cap both of them and install an avionics cooling fan for your radios. Clarence Quote Link to comment Share on other sites More sharing options...
N201MKTurbo Posted September 7, 2019 Report Share Posted September 7, 2019 Jinx 1 Quote Link to comment Share on other sites More sharing options...
N9434V Posted September 7, 2019 Author Report Share Posted September 7, 2019 thanks, I see corks in my future :-) Quote Link to comment Share on other sites More sharing options...
milotron Posted September 7, 2019 Report Share Posted September 7, 2019 I had one of these open on my M20K. I got a couple of red cap-plugs from Spruce and covered them. They are 5/8" I think. Quote Link to comment Share on other sites More sharing options...
Yetti Posted September 7, 2019 Report Share Posted September 7, 2019 You could use the horse hair material to fill the end so they pass air and not water Quote Link to comment Share on other sites More sharing options...
cliffy Posted September 8, 2019 Report Share Posted September 8, 2019 The water has to go somewhere- Cap it and forget it Quote Link to comment Share on other sites More sharing options...
N201MKTurbo Posted September 8, 2019 Report Share Posted September 8, 2019 I have mine pointed in innocuous locations. There needs to be some fresh air behind the panel. It is like a solar cooker in there. Especially sense I got the Avidyne. That thing will burn your fingers in the summer (not exaggerating). An avionics cooling fan will not remove any heat from behind the panel, it just runs it around in circles. I have the hoses pointed so the worse they will do is get my feet wet, which they have never done. I flew through some pretty heavy rain on Thursday with no water on my feet. Quote Link to comment Share on other sites More sharing options...
ArtVandelay Posted September 8, 2019 Report Share Posted September 8, 2019 My hose rises about 8” and then is run to the behind of the radio stack, but not attached, so any water will just drip free, which I doubt I’ll ever see, there just isn’t enough air pressure to force the water up the 8” rise.Tom Quote Link to comment Share on other sites More sharing options...
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