Rotating Beacon Packed with Silicone

[thomas1142]

I just took apart a rotating beacon (located on the belly) from a 1997 M20J and found the unit electronics are encased in some type of silicone. Would anyone know what that silicone is and what I can replace it with?

Thanks

[carusoam]

Often electronic things get buried in epoxy… which is a hard finished product…

Got any pics of it?
 

Best regards,

-a-

[thomas1142]

I cleaned it all up. The substance look and felt like silicone, very soft and flexible. I would say just like silicone caulking.

[philiplane]

someone loaded it up trying to prevent corrosion from water inside the lens. A lot of these were water traps.

Not needed if the drain hole in the lens is open. 

[PT20J]

Humiseal is pretty standard in the electronics industry for protecting circuit boards from moisture.

https://chasecorp.com/HumiSeal/

[Guest]

We’re replacing a Whelen LED belly beacon on an Ovation because it wasn’t sealed, and had no drain hole in the lens.  It had some TKS fluid inside.  Sealing and a drain hole are important.

Clarence

[A64Pilot]

Is it actually a rotating beacon? just curious.

[thomas1142]

1 hour ago, A64Pilot said:

Is it actually a rotating beacon? just curious.

Mine just flashes, no rotating.

[thomas1142]

2 hours ago, M20Doc said:

Sealing and a drain hole are important

I don’t think their is a drain hole in my lens either, I’ll be drilling.

[A64Pilot]

9 hours ago, thomas1142 said:

I don’t think their is a drain hole in my lens either, I’ll be drilling.

Assuming it’s decades old and if it has no liquid in it, why would you?

 

[thomas1142]

14 hours ago, A64Pilot said:

Assuming it’s decades old and if it has no liquid in it, why would you?

That’s very true. It did not have any water, nor was there any evidence that water had penetrated at any time. Maybe I’ll just monitor it after I get it back together just to make sure my installation is as good as the original.