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Topic Options
#406589 - 09/18/20 10:52 AM Avionics cooling air vents.
wildduk Offline
Second in Command

Registered: 07/07/17
Posts: 180
Loc: georgia
Does anyone know or have a diagram on how those little scoops begind cowl are supposed to vent and cool the avionics. I canít find a diagram anywhere.
Whatever it is, mine have been disconnected and there is just a hole there with a small plastic piece protruding behind panel that looks like what you would hook tubing up to.

Thx

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#406591 - 09/18/20 01:23 PM Re: Avionics cooling air vents. [Re: wildduk]
Joeman434 Offline
Diamond Pilot

Registered: 02/19/14
Posts: 6922
Loc: Ocala, Florida
There originally were cooling pates on the sides of your avionics and scat hoses connected to the cooling plats.
_________________________
Do it right the first time.

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#406593 - 09/18/20 01:37 PM Re: Avionics cooling air vents. [Re: wildduk]
Challenger1 Offline
Gold Pilot

Registered: 03/23/16
Posts: 2433
Loc: Cincinnati, Ohio
I believe mine were connected to this blower? Then the blower was connected to each device?

The blower on the right in this picture was removed from my plane as the GPS has it's own fan that comes on when needed.

Under my panel the hoses are still connected to the outside air scoop and are open under the panel feeding fresh air to the avionics stack.

Last winter I flew while it was single digit temps and froze my butt off. Now I know why, this winter I am tapping off the outside air scoops to keep the cold air out of the cockpit.
In this picture you can see one of them, they are open on the ends pointing at my avionics stack and feed outside air under my panel when the motor is running.

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#406595 - 09/18/20 03:09 PM Re: Avionics cooling air vents. [Re: Challenger1]
wildduk Offline
Second in Command

Registered: 07/07/17
Posts: 180
Loc: georgia
So you took that little fan out? Was that fan always powered?

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#406636 - 09/20/20 04:15 PM Re: Avionics cooling air vents. [Re: wildduk]
Challenger1 Offline
Gold Pilot

Registered: 03/23/16
Posts: 2433
Loc: Cincinnati, Ohio
My avionics shop took the blower out. As far as I know it was on whenever the avionics switch was on.

I think the mounting trays have the air nipple that the air ducts connected to from the blower?

Here is another tray with a nipple for a duct hose. They said modern solid state avionics do not need the blower and there is not enough room for the blower.

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#406641 - 09/20/20 09:33 PM Re: Avionics cooling air vents. [Re: Challenger1]
C420sailor Offline
Gold Pilot

Registered: 11/18/16
Posts: 1568
Loc: Virginia
From what Iíve heard, a cooling fan isnít required with modern avionics...but in hot climates it can extend the life of the equipment. Inside an airplane under the Texas sun, even modern avionics can get brutally hot.
_________________________
Currently transitioning from the F/A-18E to the C-172M...to a damn desk.

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#406644 - 09/20/20 11:29 PM Re: Avionics cooling air vents. [Re: C420sailor]
Flubber4.0 Offline
Gold Pilot

Registered: 08/22/14
Posts: 1241
Loc: blue marble
The computerized 'modern' avionics usually does bring their own fans, so the central one may simply no longer be needed. I am not 100 percent happy about it, because it pulls one point to look at an replaces it with several points of failure.
_________________________
Never give up, never surrender. Activate the Omega-13.

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