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When / where to use dielectric grease?

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Jan 02, 2019 5:28 am Post subject: When / where to use dielectric grease?

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: 56

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

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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