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
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Subject: | Re: 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 <Mauledriver@nc.rr.com> 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
>>
>
>
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Message 2
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Subject: | Re: Unsupported coax length |
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 <Mauledriver@nc.rr.com
> <mailto:Mauledriver@nc.rr.com>> wrote:
>
> <Mauledriver@nc.rr.com <mailto: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.
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Subject: | Re: 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 . . .
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Subject: | Re: 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 <ceengland7@gmail.com>
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 <Mauledriver@nc.rr.com>
> 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 -
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>> ===================================
>> b Site -
>> -Matt Dralle, List Admin.
>> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
>> ===================================
>>
>>
>>
>>
>
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