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Serious question, tried dielectric grease on a King KX 155 backplate and it fixed a squawk I chased for 3 weeks
A while back I picked up a Cessna 172 that had the classic King KX 155 com dropping in and out on the ground but fine in the air. I pulled the tray, hit the backplate pins with contact cleaner, and it still did it. Third time through I tried a thin smear of dielectric grease on the connector pins just to see what would happen. Figured it would gum things up honestly. What happened is the com worked solid for 6 flights straight and the owner stopped calling me. Pulled the tray again a month later expecting a mess and the pins looked clean, no green, no corrosion creeping in. What I took from it is that a lot of these intermittent gripes are moisture and oxidation we keep chasing with new radios when the connection itself is the problem. Has anyone run dielectric grease on a King backplate long term and had it bite them later, or did I just get lucky on this one?
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alicemurphy28d ago
Ran into the same thing on a 182 with a KX 155, and the grease held up fine for two years until the plane sold. What I did was clean the pins with DeoxIT first, let them dry, then just a tiny bit on a Q-tip, barely a film. Too much and it'll grab dirt and hold it, so the trick is almost nothing on there. Never saw any green or gumming, and the radio stayed solid the whole time.
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