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Jim Baker
Joined: 30 Mar 2006
Posts: 181
Location: Sayre, PA
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 Posted: Thu Sep 27, 2007 7:09 pm Post subject: High temp p-lead wire..... |
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Tho not precicely OBAM directed....
Bellanca Viking aircraft have a soon-to-be-implemented AD to re-
route p-leads from a common Cannon connector on the left firewall to
separate leads to each side of the upper firewall....somehow the FAA
believes this will result in a safer aircraft after the outbreak of a
fire in the engine compartment ( caused by a related exhaust system
failure which will most likely be a concurrent AD with the p-lead
issue).
The question is this.....I've looked at several wire specs, such as
MIL-W-25038/3, and the specs are adequate but there doesn't seem to
be any shielded wire in this spec. Is there such a product? Or is
there another product more suitable?
Thanks...
Jim Baker
580.788.2779
Elmore City, OK
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rjquillin
Joined: 13 May 2007
Posts: 123
Location: KSEE
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| Posted: Thu Sep 27, 2007 7:47 pm Post subject: High temp p-lead wire..... |
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Jim,
The core wire being used in the proposed Bellanca P-lead AD is indeed
M25038/3, but the full spec for the shielded cable is either
M27500-20JF1N06 or M27500-22JF1N06. I couldn't get the supplier to
confirm wire gauge, but based on existing cable my bet would be on the 20AWG.
Ron Q.
At 19:59 9/27/2007, you wrote:
| Quote: | The question is this.....I've looked at several wire specs, such as
MIL-W-25038/3, and the specs are adequate but there doesn't seem to
be any shielded wire in this spec. Is there such a product? Or is
there another product more suitable?
Thanks...
|
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nuckolls.bob(at)cox.net
Guest
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| Posted: Fri Sep 28, 2007 9:59 am Post subject: High temp p-lead wire..... |
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At 09:59 PM 9/27/2007 -0500, you wrote:
| Quote: |
Tho not precicely OBAM directed....
Bellanca Viking aircraft have a soon-to-be-implemented AD to re-
route p-leads from a common Cannon connector on the left firewall to
separate leads to each side of the upper firewall....somehow the FAA
believes this will result in a safer aircraft after the outbreak of a
fire in the engine compartment ( caused by a related exhaust system
failure which will most likely be a concurrent AD with the p-lead
issue).
The question is this.....I've looked at several wire specs, such as
MIL-W-25038/3, and the specs are adequate but there doesn't seem to
be any shielded wire in this spec. Is there such a product? Or is
there another product more suitable?
|
The reason you're not seeing shielded products is that
the specification is for WIRE, as soon as you add shielding
it becomes a CABLE assembly consisting of some combinations
of wire with some over-braid of shield and an outer jacket.
One of the popular specs for shielded cable assemblies is
Mil-W-27500. See page 17 of:
http://www.cambridge-tec.com/pdf/Cable_catalog.pdf
As you see here, you can craft a part number for any
combination of wire, shielding, and outer jackets
to satisfy your every need. Now, write a check for
about 10,000' of the stuff and they'll whip out a
spool for you.
Obviously, there ARE common combinations
of wire, shielding and jacket used by the industry
where you have a high order probability of finding
a suitable wire already in stock on some supplier's
shelf. If you're needing a modern wire suitable for
shielded p-leads on an SE aircraft, consider the
20 or 18AWG shielded wire per Mil-W-27500 offered
by Steinair at:
http://steinair.com/wire.htm#SHIELDED%20WIRE
Bob . . .
----------------------------------------
( "Problems are the price of progress. )
( Don't bring me anything but trouble. )
( Good news weakens me." )
( -Charles F. Kettering- )
----------------------------------------
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Jim Baker
Joined: 30 Mar 2006
Posts: 181
Location: Sayre, PA
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| Posted: Fri Sep 28, 2007 5:44 pm Post subject: High temp p-lead wire..... |
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| Quote: | The reason you're not seeing shielded products is that
the specification is for WIRE, as soon as you add shielding
it becomes a CABLE
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As always, I learn something of value. Thanks to Ron and Bob.
Perhaps I don't need 10k feet....two orders of magnitude will do
nicely.....
http://tinyurl.com/22ud4e
Now, about that shipping.....
Jim Baker
580.788.2779
Elmore City, OK
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nuckolls.bob(at)cox.net
Guest
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| Posted: Fri Sep 28, 2007 6:27 pm Post subject: High temp p-lead wire..... |
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At 08:41 PM 9/28/2007 -0500, you wrote:
| Quote: |
> The reason you're not seeing shielded products is that
> the specification is for WIRE, as soon as you add shielding
> it becomes a CABLE
As always, I learn something of value. Thanks to Ron and Bob.
Perhaps I don't need 10k feet....two orders of magnitude will do
nicely.....
http://tinyurl.com/22ud4e
Now, about that shipping.....
|
This is single strand, unshielded wire.
Bob . . .
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