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When / where to use dielectric grease?

 
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nuckolls.bob(at)aeroelect
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PostPosted: Wed Jan 02, 2019 5:28 am    Post subject: When / where to use dielectric grease? Reply with quote

At 06:38 AM 1/2/2019, you wrote:
Quote:
--> AeroElectric-List message posted by: "blues750" <den_beaulieu(at)yahoo.com>

Here are a few pics of the connector in case anything can be determined by the pic. Will post pics of crimps when I remove wires and assess. Thanks for the input all. Dave

It is interesting that the nylon housing
appears uniformly discolored suggesting
uniform distribution of 'stress' through
the connector. Loss of conductive integrity
is usually concentrated in one of the
several wires where a failure cascade
began.

This suggests a distributed condition
probably based in inadequate crimps
on all the wires. Presence or lack
of DE grease for moisture exclusion
was probably not a factor in this
failure.

What tool was used to install the
terminals?

DE grease is a good idea for joints
at particular risk for corrosion due
to moisture ingress. We used to pack
a coax connector with DC4 before mating
followed by lotsa wrap with Scotch 33 tape
on towers. Having a connector go south
175 feet up on a tower is a real pain
in the arse, legs, arms, etc, etc.

But generally speaking, very few situations
in aircraft benefit by the addition of
DE grease. If there is a situation where
an electrical joining is subject to
assault from moisture, there will be
features other than electrical joints
also under assault. Keeping the moisture
off is generally better than trying to
keep it out. Ref: the failed attempt
at Cessna to 'seal' contactors that
were receiving splash from rainwater.


Bob . . .


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blues750



Joined: 06 Jun 2015
Posts: 46

PostPosted: Wed Jan 02, 2019 4:37 pm    Post subject: Re: When / where to use dielectric grease? Reply with quote

Thanks Bob, I need to look at the crimping tool box to see what I used to do the crimps. As always, appreciated the insight!! Dave

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