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  #1  
Old 12-27-2014, 06:48 PM
rightrudder rightrudder is offline
 
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Location: Laguna Hills, CA
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Default Headphone/mic jack mounting

Hi guys,

A couple of quick questions. I bought the harness for my comm pre-made from ACS.

1) When mounting these, do you drill a hole for the size of the threads, or a larger hole for the boss at the base of the threads?

2) The photo shows how all the various washers were mounted on the jack. When installing, does it go nut/metal washer/fiber washer/panel/shoulder washer/jack? And does the shoulder portion fit up inside of the hole, or point toward the jack?

If it makes any difference, the harness is wired with PTT ground leads.

I was Googling this like mad, trying to find a simple drawing, but couldn't find a thing.

Thanks!

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  #2  
Old 12-27-2014, 06:52 PM
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Mike S Mike S is offline
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Drill the hole to fit the raised portion on the black washer. The shoulder fits inside the panel hole.

When correctly done, the shell of the jack is electrically insulated from the panel.

Quote:
Originally Posted by rightrudder View Post

When installing, does it go nut/metal washer/fiber washer/panel/shoulder washer/jack? And does the shoulder portion fit up inside of the hole,
Yes.

Quote:
Originally Posted by rightrudder View Post
or point toward the jack?
No.
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Last edited by Mike S : 12-27-2014 at 06:56 PM.
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  #3  
Old 12-27-2014, 07:40 PM
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Jesse Jesse is offline
 
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Exactly as mike said. No part of metal on the jack should be grounded to the airframe, hence the shoulder washer and fiber washer.
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  #4  
Old 12-27-2014, 07:50 PM
rightrudder rightrudder is offline
 
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Thanks, guys. That all makes perfect sense. Now here's a wrinkle: the Mic jacks have what looks to be an index or anti-rotation tab, oriented so the collared washer won't sit flat at the base of the threads. ????? Should I grind it off or bend it flat?

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Last edited by rightrudder : 12-27-2014 at 07:52 PM.
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  #5  
Old 12-27-2014, 08:24 PM
BobTurner BobTurner is offline
 
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grind it off.
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  #6  
Old 12-27-2014, 09:15 PM
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Walt Walt is offline
 
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or slipping a standard 3/8 (or 7/16) washer on it will work also.
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  #7  
Old 12-27-2014, 10:59 PM
rightrudder rightrudder is offline
 
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Thanks a ton, guys. I appreciate the quick and knowledgeable responses.
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  #8  
Old 12-27-2014, 11:04 PM
rapid_ascent rapid_ascent is offline
 
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Yeah I bought those same jacks from Aircraft Spruce. I used my diagonal cutters and a couple of quick hits with the file and no more anti-rotation tabs.
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  #9  
Old 01-17-2015, 04:09 PM
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Caummisar Caummisar is offline
 
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Default Insulating Washers

If you drill the mounting hole to the standard 0.50 inches and then find that the raised portion of the washer is too small for the 0.50" opening, B&C Specialty Products sell insulating washers for 50 cents a set that will fit the standard hole size. Their part number S892. The ACS washers were 7/16" for the raised part of the washer and too small for the 0.50 hole.
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