Radio Blower

[M20J-Uwe]

Technical / procurement question: I am looking for a Radio Blower Kit 28V for my M20J MSE 201 243164. I have an offer for about 3000€ with 16 weeks delivery time. Does anyone have a source for repair or procurement? Do you even need it with modern avionics? I have meanwhile GNS530, 430 and G5 installed. Autopilot, ADF and DME are still original. Thanks

[Fly Boomer]

40 minutes ago, M20J-Uwe said:

Technical / procurement question: I am looking for a Radio Blower Kit 28V for my M20J MSE 201 243164. I have an offer for about 3000€ with 16 weeks delivery time. Does anyone have a source for repair or procurement? Do you even need it with modern avionics? I have meanwhile GNS530, 430 and G5 installed. Autopilot, ADF and DME are still original. Thanks

Welcome to MooneySpace!  You will hear competing opinions here, but I subscribe to the theory that heat is bad for electronics, connections, etc.  This somewhat dated article from Aviation Consumer supports that theory:
https://www.aviationconsumer.com/avionics/avionics-cooling-fans/

Lone Star makes several generic examples:
https://lonestaraviation.com/?s=blower&post_type=product&type_aws=true&v=47e5dceea252

That said, any of these would have to be adapted to your airplane.  The one Mooney used may be more difficult to find at a reasonable price.

Also, @jetdriven (Byron) is a well-known and respected East Coast shop that maintains Mooneys for many of our members.  He posted several years ago that he custom fitted a Troll FN-300 fan in a 1977 M20J.  They may not be making them any longer, but examples are available:
https://www.ebay.com/p/10012440786

Or this Bendix-King KA-33:
https://www.ebay.com/itm/275701120702?chn=ps&norover=1&mkevt=1&mkrid=711-213727-13078-0&mkcid=2&itemid=275701120702&targetid=4580153136941819&device=c&mktype=&googleloc=&poi=&campaignid=437225723&mkgroupid=1224856224320864&rlsatarget=pla-4580153136941819&abcId=9300907&merchantid=51291&msclkid=282eb06ff5561dd18d1ed4e251b96354

[PT20J]

You can check the installation manuals for whatever avionics you have for cooling requirements, but all my Garmin units either have their own fan or don’t require one. Modern avionics are much more energy efficient than the old stuff and don’t generate nearly as much heat. Some Garmin installation manuals are only available to dealers, so you might have to call a Garmin dealer.

[A64Pilot]

Since he is in Germany I’d say he probably doesn’t need a fan.

My rule is if the box has a fan port, it gets one, you will know it’s a rather obvious tube sticking out the back

‘But in the South in the US I think a fan wired to the Master is a good idea, even if you just stop to eat, in the blazing Summer heat the avionics get heat soaked, if the blower is wired to the Master then you can run the fan for a minute or two and cool things down before you turn them on, because that black glare shield absorbs quite a lot of heat.

I too believe heat kills electronics and while it’s true modern ones don’t generate as much heat operating, they can still get heat soaked in a hot cockpit.

For some dumb reason the top of my Mooney is painted dark blue and the bottom white, painted that way you can get skin burns just getting in the thing and the inside is like an oven, sure wish it was white on top and blue on the bottom.

[laytonl]

I replaced mine with a cyclone 21.  It required some modification of the mounting bracket and is a difficult location to access. Probably 3 hours install time.  Lee

https://lonestaraviation.com/product/3-port-blower-aircraft-14v-crb-6457-28v-crb-122253/?v=47e5dceea252