VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #11  
Old 02-03-2017, 06:24 PM
SMO's Avatar
SMO SMO is offline
 
Join Date: Oct 2007
Location: Salmon Arm, BC
Posts: 933
Default

I believe when the drawing designates the Garmin Shield Block (triangle with the "s") the draftsman anticipated that a Garmin backshell with provision for ground wires will be used, and when the drawing designates an aircraft ground the draftsman anticipated the backshell for that device would not have a provision for the ground wires. In this latter situation I have grounded the shield to the devices' tray. Eg - the 430 backshell does not have a provision for ground wires on it and shield grounding goes to the tray.
__________________
Mark Olson
1987 RV-4 Sold
2003 Super Decathlon - Sold
F1 EVO Rocket, first flight May 31/14
First in line for the Sonex JSX-2T kit
Reply With Quote
  #12  
Old 02-03-2017, 07:15 PM
Chkaharyer99 Chkaharyer99 is offline
 
Join Date: Oct 2011
Location: Pilot Hill, CA
Posts: 845
Default

Mark and the others are right. The ground wires on the GTX 345 RS232 and ARINC 429 cables terminate on the 345 connector shell. My applogies for any confusion I may have caused.
__________________
Charlie
RV-8
Reply With Quote
  #13  
Old 02-03-2017, 08:46 PM
leok leok is offline
 
Join Date: Apr 2013
Location: Clarkston, MI
Posts: 375
Default

Chapter 24 of the G3X install manual shows all of the LRU (line replaceable units) interconnect drawings with a symbol chart. (note 4)

Note 5 states : "Unless otherwise noted, all shield grounds must be made to the respective backshells. All other grounds should be terminated to the aircraft ground as close to the respective unit as possible."

Based on that note, I have been adding or using an existing bolt/ring terminal to the structure, that I can access for maintenance, directly next to the component.
__________________
Building started Oct 5th 2014, Flying since 1/16/2020
http://www.mykitlog.com/leok
RV Hotel, come by and visit if you're in town
Dues paid 2020
Reply With Quote
  #14  
Old 02-04-2017, 04:37 PM
Chkaharyer99 Chkaharyer99 is offline
 
Join Date: Oct 2011
Location: Pilot Hill, CA
Posts: 845
Default

Quote:
Originally Posted by RVG8tor View Post
This does help. Did you also add pig tail to the shield on the GTX 345 end and attach that to the shield ground block on that connector?

For the life of me, I can't understand the difference between these two connections and why they are depicted differently. It seems to me to be the same thing.

Perhaps it is the difference between a ground block that is part of the back panel, like the 430W, versus the ground block that is part of the D-sub connector body.

Cheers
Mike,

I sent you a PM.
__________________
Charlie
RV-8
Reply With Quote
  #15  
Old 02-05-2017, 03:01 AM
mavmitchell mavmitchell is offline
 
Join Date: Jul 2013
Location: Perth
Posts: 27
Default

Quote:
Originally Posted by Chkaharyer99 View Post
I recently installed a GTX345 in my RV-8. It has a single GNS 430W.

I attached the (pig tail) ground wires to the black connector block located on the bottom left side of the 430W looking at it from the back. I hope this helps.


Hi Mike,

As Charlie has indicated, the Garmin way of connecting the shield on a 430 is to the black connector block on the rear of the rack. I have found this difficult if you don't have the pins for this.

I have done quite a few of these, I would connect the shields to the connector shield block if they have one(The GTX does), and at the 430 end connect to the black earthing block if you have pins for the connector and there is spare/open position. If not I would put a ring on the shield wire and connect it to the strain relief screw on the 430 connector or anywhere close where you could get a screw installed.

Cheers.

Bruce.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 02:52 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.