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  #1  
Old 11-18-2019, 09:42 PM
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Dugaru Dugaru is offline
 
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Location: Richmond VA, USA
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Default Crumbling backshell

Electrical gurus:

I noticed a little gray fleck of plastic on the floor of my RV-9A. Investigated and discovered the backshell of one of the d-sub connectors on my EIS 4000 was crumbling at the screw locations. Not a great photo but it gives you the gist:

https://share.icloud.com/photos/0BIl...GHV78zK_8iOzmg

This is presumably the d-sub connector that was installed by the builder back in the 2005-2007 time frame.

And there's more: the crumbling pieces (one chunk fell off into my fingers when I touched the connector) felt slightly oily, as if they had just the tiniest misting of a really light machine oil.

I didn't see any obvious signs of staining, leaks, etc. anywhere behind the panel, but I didn't do any really serious spelunking yet.

What's going on here, do you think?

Also: what brand/kind of backshell should I replace it with? Given the joys of rooting around behind the panel, I'd like something as durable as possible!

Thanks in advance for any ideas.
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  #2  
Old 11-18-2019, 11:48 PM
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Default DB-25 backshell

What you need is something like this:

https://www.amazon.com/Metalized-Pla.../dp/B01NAPY8I2

You can get them in many places, but I'd plan to pull the panel and see what's going on. Sounds like there is more to this story. Will be a great experience for you if you have not done this before.
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  #3  
Old 11-19-2019, 05:36 AM
noelf noelf is online now
 
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Default

SteinAir and Aircraft Spruce both have backshell kits for these connectors.
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  #4  
Old 11-19-2019, 06:38 AM
chaskuss chaskuss is offline
 
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Default Replacing plastic with more plastic??

Quote:
Originally Posted by rv8ch View Post
What you need is something like this:

https://www.amazon.com/Metalized-Pla.../dp/B01NAPY8I2

You can get them in many places, but I'd plan to pull the panel and see what's going on. Sounds like there is more to this story. Will be a great experience for you if you have not done this before.
Mickey,
Your link shows more plastic housings. How are these better than what he is having problems with? Are you using these items with success? Just asking.

Charlie
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  #5  
Old 11-19-2019, 07:16 AM
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BCP Boys BCP Boys is offline
 
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Default

Buy them from Stein and be done with it. If possible, try to get the ones that have slot ends on the screws so you can use a small screw driver to help reach in tight places.
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  #6  
Old 11-19-2019, 08:20 AM
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Dugaru Dugaru is offline
 
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Default Thanks to all

I really appreciate the info. My working theory is that, unrelated to my degrading connector, I may be getting just a hint of water behind the panel. Flew through some rain lately. In any event, I need to chase that down as well!
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  #7  
Old 11-19-2019, 08:25 AM
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rv8ch rv8ch is offline
 
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Default DB housing

Quote:
Originally Posted by chaskuss View Post
Mickey,
Your link shows more plastic housings. How are these better than what he is having problems with? Are you using these items with success? Just asking.

Charlie
Hi Charlie, yes, I've used plastic, "metalized" plastic, and metal. For back of the panel to connect to the EIS and EFIS, there's not a lot of difference between them. The area behind the panel should be very much a "shirt-sleeve" environment.
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  #8  
Old 11-19-2019, 08:27 AM
rapid_ascent rapid_ascent is offline
 
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To me it just looks like the attachment screws were over tightened and probably cracked the backshell. This type of plastic is pretty brittle.
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