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Unsupported coax length

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paul(at)eckenroth.com
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Posted: Sat Sep 23, 2017 4:59 pm Post subject: Unsupported coax length

Looking for advise on what the max acceptable unsupported horizontal length of RG400 coax might be.Â  I have 23" between fuselage ribs and was planning on running the coax through a grommet in the tooling holes but then started questioning if this was good practice.Â  So opinions are requested.



Thanks

Paul

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Mauledriver(at)nc.rr.com
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Posted: Sun Sep 24, 2017 3:09 am Post subject: Unsupported coax length

No answers here, just what I did: I ran my RG400 through grommets but 

also ran several other wires along with it.Â  They were bound together 

with the waxed thread stuff at roughly 12" to 18" intervals.Â  It seems 

to me that combining wires in a bundle provided a certain level of 

support.Â  I think some of the written guidelines suggest the same.



My guess is that RG400 alone thru grommets is just fine as well.



On 9/23/2017 8:58 PM, Paul Eckenroth wrote:

 	  Quote: 	
		   Looking for advise on what the max acceptable unsupported horizontal 

 length of RG400 coax might be.Â  I have 23" between fuselage ribs and 

 was planning on running the coax through a grommet in the tooling 

 holes but then started questioning if this was good practice.Â  So 

 opinions are requested.



 Thanks

 Paul


	


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N509RV(at)eckenroth.com
Guest

Posted: Mon Sep 25, 2017 7:09 am Post subject: Unsupported coax length

Bill



Thanks for your reply.Â  I was hoping for a more definitive statement from one of the very experienced technicians on the list.Â  Your reply mirrors what my intuition tells me.

PaulÂ 

On Sun, Sep 24, 2017 at 7:05 AM, Bill Watson <Mauledriver(at)nc.rr.com (Mauledriver(at)nc.rr.com)> wrote:

 	  Quote: 	
		  --> AeroElectric-List message posted by: Bill Watson <Mauledriver(at)nc.rr.com (Mauledriver(at)nc.rr.com)>

 

 No answers here, just what I did: I ran my RG400 through grommets but also ran several other wires along with it.Â  They were bound together with the waxed thread stuff at roughly 12" to 18" intervals.Â  It seems to me that combining wires in a bundle provided a certain level of support.Â  I think some of the written guidelines suggest the same.

 

 My guess is that RG400 alone thru grommets is just fine as well.

 

 On 9/23/2017 8:58 PM, Paul Eckenroth wrote:

  	  Quote: 	
		   Looking for advise on what the max acceptable unsupported horizontal length of RG400 coax might be.Â  I have 23" between fuselage ribs and was planning on running the coax through a grommet in the tooling holes but then started questioning if this was good practice.Â  So opinions are requested.

 

 Thanks

 Paul

 	
 

 

 

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ceengland7(at)gmail.com
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Posted: Mon Sep 25, 2017 7:48 am Post subject: Unsupported coax length

From FAA maintenance doc AC 43.13-1B       section 8Â  (downloadable for free, if you don't have a copy):

       

       a.

         Wires and cables are supported by suitable clamps,           grommets, or other devices at intervals of not more than 24           inches, except when contained in troughs, ducts, or conduits.           The supporting devices should be of a suitable size and type,           with the wires and cables held securely in place without           damage to the insulation.

       

       That help?

       

       Charlie

       On 9/25/2017 10:07 AM, Paul Eckenroth wrote:

     

      	  Quote: 	
		         Bill         

         

         Thanks for your reply.Â  I was hoping for a more definitive           statement from one of the very experienced technicians on the           list.Â  Your reply mirrors what my intuition tells me.

         

         

         PaulÂ 

       

       

         On Sun, Sep 24, 2017 at 7:05 AM, Bill           Watson <Mauledriver(at)nc.rr.com (Mauledriver(at)nc.rr.com)>           wrote:

            	  Quote: 	
		  -->             AeroElectric-List message posted by: Bill Watson <Mauledriver(at)nc.rr.com (Mauledriver(at)nc.rr.com)>

             

             No answers here, just what I did: I ran my RG400 through             grommets but also ran several other wires along with it.Â              They were bound together with the waxed thread stuff at             roughly 12" to 18" intervals.Â  It seems to me that combining             wires in a bundle provided a certain level of support.Â  I             think some of the written guidelines suggest the same.

             

             My guess is that RG400 alone thru grommets is just fine as             well.                            

                 

                 On 9/23/2017 8:58 PM, Paul Eckenroth wrote:

                  	  Quote: 	
		                     Looking for advise on what the max acceptable                   unsupported horizontal length of RG400 coax might be.Â                    I have 23" between fuselage ribs and was planning on                   running the coax through a grommet in the tooling                   holes but then started questioning if this was good                   practice.Â  So opinions are requested.

                   

                   Thanks

                   Paul

                 	
                 

                 

                 

               

             

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nuckolls.bob(at)aeroelect
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Posted: Mon Sep 25, 2017 7:52 am Post subject: Unsupported coax length

 	  Quote: 	
		   

  On 9/23/2017 8:58 PM, Paul Eckenroth wrote:

   Looking for advise on what the max acceptable unsupported horizontal length of RG400 coax might be.Â  I have 23" between fuselage ribs and was planning on running the coax through a grommet in the tooling holes but then started questioning if this was good practice.Â  So opinions are requested. 	
  

   I seem to recall that AC43-13 used to quote a 24" max, unsupported

   span . . . waaayyyy back when. But I don't find it in my latest

   copy. Unless you're into energetic aerobatics, I suspect that

   24" is fine. Alternatively, you could add some 'bond studs' to the

   inside of the skin at the half-way points.



  http://tinyurl.com/hxczu3r



 



 



 

   Bob . . .

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N509RV(at)eckenroth.com
Guest

Posted: Mon Sep 25, 2017 8:36 am Post subject: Unsupported coax length

Charlie and Bob.Â Â 



Thanks for info.Â I'm right at the limit but don't think I will be doing energetic aerobatics.

Paul



On Mon, Sep 25, 2017 at 11:50 AM, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:

 	  Quote: 	
		                     From FAA maintenance doc AC 43.13-1B       section 8Â  (downloadable for free, if you don't have a copy):

       

       a.

         Wires and cables are supported by suitable clamps,           grommets, or other devices at intervals of not more than 24           inches, except when contained in troughs, ducts, or conduits.           The supporting devices should be of a suitable size and type,           with the wires and cables held securely in place without           damage to the insulation.

       

       That help?

       

       Charlie

       On 9/25/2017 10:07 AM, Paul Eckenroth wrote:

     

      	  Quote: 	
		         Bill         

         

         Thanks for your reply.Â  I was hoping for a more definitive           statement from one of the very experienced technicians on the           list.Â  Your reply mirrors what my intuition tells me.

         

         

         PaulÂ 

       

       

         On Sun, Sep 24, 2017 at 7:05 AM, Bill           Watson <Mauledriver(at)nc.rr.com (Mauledriver(at)nc.rr.com)>           wrote:

            	  Quote: 	
		  -->             AeroElectric-List message posted by: Bill Watson <Mauledriver(at)nc.rr.com (Mauledriver(at)nc.rr.com)>

             

             No answers here, just what I did: I ran my RG400 through             grommets but also ran several other wires along with it.Â              They were bound together with the waxed thread stuff at             roughly 12" to 18" intervals.Â  It seems to me that combining             wires in a bundle provided a certain level of support.Â  I             think some of the written guidelines suggest the same.

             

             My guess is that RG400 alone thru grommets is just fine as             well.                            

                 

                 On 9/23/2017 8:58 PM, Paul Eckenroth wrote:

                  	  Quote: 	
		                     Looking for advise on what the max acceptable                   unsupported horizontal length of RG400 coax might be.Â                    I have 23" between fuselage ribs and was planning on                   running the coax through a grommet in the tooling                   holes but then started questioning if this was good                   practice.Â  So opinions are requested.

                   

                   Thanks

                   Paul

                 	
                 

                 

                 

               

             

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