---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 09/25/17: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:09 AM - Re: Unsupported coax length (Paul Eckenroth) 2. 08:48 AM - Re: Unsupported coax length (Charlie England) 3. 08:52 AM - Re: Unsupported coax length (Robert L. Nuckolls, III) 4. 09:36 AM - Re: Unsupported coax length (Paul Eckenroth) ________________________________ Message 1 _____________________________________ Time: 08:09:29 AM PST US From: Paul Eckenroth Subject: Re: AeroElectric-List: Unsupported coax length Bill Thanks for your reply. I was hoping for a more definitive statement from one of the very experienced technicians on the list. Your reply mirrors what my intuition tells me. Paul On Sun, Sep 24, 2017 at 7:05 AM, Bill Watson wrote: > Mauledriver@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. They were bound together with the > waxed thread stuff at roughly 12" to 18" intervals. It seems to me that > combining wires in a bundle provided a certain level of support. 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: > >> Looking for advise on what the max acceptable unsupported horizontal >> length of RG400 coax might be. 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. So opinions are >> requested. >> >> Thanks >> Paul >> > > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > ________________________________ Message 2 _____________________________________ Time: 08:48:07 AM PST US Subject: Re: AeroElectric-List: Unsupported coax length From: Charlie England From FAA maintenance doc AC 43.13-1B section 8 (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: > Bill > > Thanks for your reply. I was hoping for a more definitive statement > from one of the very experienced technicians on the list. Your reply > mirrors what my intuition tells me. > > Paul > > On Sun, Sep 24, 2017 at 7:05 AM, Bill Watson > wrote: > > > > > No answers here, just what I did: I ran my RG400 through grommets > but also ran several other wires along with it. They were bound > together with the waxed thread stuff at roughly 12" to 18" > intervals. It seems to me that combining wires in a bundle > provided a certain level of support. 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: > > Looking for advise on what the max acceptable unsupported > horizontal length of RG400 coax might be. 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. So opinions are requested. > > Thanks > Paul > > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > =================================== > - > Electric-List" rel="noreferrer" > target="_blank">http://www.matronics.com/Navigator?AeroElectric-List > =================================== > FORUMS - > eferrer" target="_blank">http://forums.matronics.com > =================================== > WIKI - > errer" target="_blank">http://wiki.matronics.com > =================================== > b Site - > -Matt Dralle, List Admin. > rel="noreferrer" target="_blank">http://www.matronics.com/contribution > =================================== > > ________________________________ Message 3 _____________________________________ Time: 08:52:11 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Unsupported coax length > >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.=C2 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.=C2 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 . . . ________________________________ Message 4 _____________________________________ Time: 09:36:26 AM PST US From: Paul Eckenroth Subject: Re: AeroElectric-List: Unsupported coax length Charlie and Bob. Thanks for info. 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 wrote: > From FAA maintenance doc AC 43.13-1B section 8 (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: > > Bill > > Thanks for your reply. I was hoping for a more definitive statement from > one of the very experienced technicians on the list. Your reply mirrors > what my intuition tells me. > > Paul > > On Sun, Sep 24, 2017 at 7:05 AM, Bill Watson > wrote: > >> Mauledriver@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. They were bound together with >> the waxed thread stuff at roughly 12" to 18" intervals. It seems to me >> that combining wires in a bundle provided a certain level of support. 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: >> >>> Looking for advise on what the max acceptable unsupported horizontal >>> length of RG400 coax might be. 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. So opinions are >>> requested. >>> >>> Thanks >>> Paul >>> >> >> >> >> --- >> This email has been checked for viruses by Avast antivirus software. >> https://www.avast.com/antivirus >> >> =================================== >> - >> Electric-List" rel="noreferrer" target="_blank">http://www. >> matronics.com/Navigator?AeroElectric-List >> =================================== >> FORUMS - >> eferrer" target="_blank">http://forums.matronics.com >> =================================== >> WIKI - >> errer" target="_blank">http://wiki.matronics.com >> =================================== >> b Site - >> -Matt Dralle, List Admin. >> rel="noreferrer" target="_blank">http://www.matronics.com/contribution >> =================================== >> >> >> >> > > > Virus-free. > www.avast.com > > <#m_1130766257584959573_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.