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12-27-2014, 06:48 PM
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Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,805
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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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Doug
RV-9A "slider"
Flew to Osh in 2017, 2018 & 2019! 
Tail number N427DK
Donation made for 2020
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart
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12-27-2014, 06:52 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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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
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,
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Yes.
Quote:
Originally Posted by rightrudder
or point toward the jack?
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No.
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
Last edited by Mike S : 12-27-2014 at 06:56 PM.
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12-27-2014, 07:40 PM
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Join Date: May 2005
Location: X35 - Ocala, FL
Posts: 3,679
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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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Jesse Saint
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12-27-2014, 07:50 PM
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Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,805
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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?

__________________
Doug
RV-9A "slider"
Flew to Osh in 2017, 2018 & 2019! 
Tail number N427DK
Donation made for 2020
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart
Last edited by rightrudder : 12-27-2014 at 07:52 PM.
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12-27-2014, 08:24 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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grind it off.
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12-27-2014, 09:15 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,687
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or slipping a standard 3/8 (or 7/16) washer on it will work also.
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Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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12-27-2014, 10:59 PM
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Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,805
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Thanks a ton, guys. I appreciate the quick and knowledgeable responses. 
__________________
Doug
RV-9A "slider"
Flew to Osh in 2017, 2018 & 2019! 
Tail number N427DK
Donation made for 2020
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart
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12-27-2014, 11:04 PM
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Join Date: Mar 2008
Location: Dublin, CA
Posts: 1,261
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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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Ray Tonks
2020 Donation Paid
Titan IOX-370, Dual PMAGs, 9.6:1 Pistons, FM-150
RV-7 Fuselage in progress
* Cabin Interior - In progress
RV-7 SB Wings
* Both Wings fully skinned
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* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
RV-7 Preview Plans
Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete
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01-17-2015, 04:09 PM
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Join Date: Jun 2007
Location: Idaho Falls, ID
Posts: 134
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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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VAF# 835
RV-7A- Instrument Panel/FWF/Engine Mounted
Slow build --- ALL THE WAY
Victim of SB-632-B
2020 Dues Paid
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