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Wing Wiring

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Michael Valentine

Joined: 09 Jan 2006
Posts: 108

Posted: Wed Jun 28, 2006 7:43 pm Post subject: Wing Wiring

Listers -



Is there anything wrong with having the wiring go through the same

lightening holes that the control cables will run through as long as

they are kept to the edge?  This would include strobe/nav,

taxi/landing, and aileron trim cables (and probably tubing for an

AOA).  Just thought this might be easier than drilling a grommet hole,

but obviously I don't want to interfere with the cables.



Thanks, Michael

Still finishing the first wing.



do not archive

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gk(at)601hd.com
Guest

Posted: Wed Jun 28, 2006 8:30 pm Post subject: Wing Wiring

Michael,

You can always use lightweight PVC conduit to be sure that the wiring stays

in a safe place.  I attached mine to brackets on the ribs with adel clamps.

The big benefit is that you can postpone the wiring until later in the

build.  It's also very easy to change wires without unzipping the wing skin.

(Photo Attached)



Graham Kirby.

601HD



Listers -



Is there anything wrong with having the wiring go through the same

lightening holes that the control cables will run through as long as they

are kept to the edge?  This would include strobe/nav, taxi/landing, and

aileron trim cables (and probably tubing for an AOA).  Just thought this

might be easier than drilling a grommet hole, but obviously I don't want to

interfere with the cables.



Thanks, Michael

Still finishing the first wing.

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peterd(at)metec.co.nz
Guest

Posted: Wed Jun 28, 2006 9:05 pm Post subject: Wing Wiring

Graham/Michael,

With respect, and wishing to make sure you don't tred on the toes of 

officialdom, it may be prudent to check that any applicable fire

ratings for PVC usage are observed. I recall PVC burns with toxic gas 

emissions. Other listers may be better aware of any local constraints.

cheers

Peter Dunning

CH601HD



---

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dredmoody(at)cox.net
Guest

Posted: Thu Jun 29, 2006 3:42 am Post subject: Wing Wiring

Nothing wrong with that as far as I can tell. I chose to use thin wall .5" 

I.D. aluminum tubing for conduit. I suspended it from .025 aluminum strips 

with a rubber grommet for the tubing. The strips are attached to the rear 

ribs with 2 A4 rivets each and they hold the conduit suspended in the 

forward lightening hole. At each end I used about 4 inches of .5" O.D. clear 

fuel line split and wrapped around the bundle of wires to prevent chafing at 

the edge of the conduit. Probably more complicated than it needs to be but I 

won't ever worry about how things are going inside that wing and I can pull 

new wire if I ever want to.



Ed

 	  Quote: 	
		   

 <mgvalentine(at)gmail.com>



 Is there anything wrong with having the wiring go through the same

 lightening holes that the control cables will run through as long as

 they are kept to the edge?  This would include strobe/nav,

 taxi/landing, and aileron trim cables (and probably tubing for an

 AOA).  Just thought this might be easier than drilling a grommet hole,

 but obviously I don't want to interfere with the cables.

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noelloveys(at)yahoo.ca
Guest

Posted: Thu Jun 29, 2006 4:17 am Post subject: Wing Wiring

AC43 recommends this:



11-125. MOVABLE CONTROLS WIRING PRECAUTIONS. 

Clamping of wires routed near movable flight controls must be attached with

steel hardware and must be spaced so that failure of a single attachment

point can not result in interference with controls.  The minimum separation

between wiring and movable controls must be at least 1/2 inch when the

bundle is displaced by light hand pressure in the direction of the controls.



I take this to mean that if your wire bundle is passing through the same

lightening holes as your flight controls it should be clamped in such a way

it won't touch the edges of the lightening holes or come close to movable

flight controls.  The cable should not move any more than 1/2" with light

hand pressure between any two clamps.



Noel



[quote] --

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frankroskind(at)hotmail.c
Guest

Posted: Thu Jun 29, 2006 6:27 am Post subject: Wing Wiring

I think the important thing here is that the FAA wants to avoid a potential 

single point failure which could lead to a loss of control.  Thus they want 

TWO or more clamps, with no single point failure mode.  This makes a lot of 

sense.  I wouldn't want to have a situation where a single cracked clamp 

leads to a loss of control.  An alternative is to find a routing where the 

wires are not using the same holes as the control cables or torque tubes.  

It does not seem to be a requirement that the bundle not move more than 1/2 

inch, rather, it seems that the distance from the wire bundle to the 

controls must be at least 1/2 inch at the least favorable displacement of 

both.



F. Roskind, Esq

A&P, PPL, Transportation Safety Economist



Reply-To: zenith-list(at)matronics.com






AC43 recommends this:



11-125. MOVABLE CONTROLS WIRING PRECAUTIONS.

Clamping of wires routed near movable flight controls must be attached with

steel hardware and must be spaced so that failure of a single attachment

point can not result in interference with controls.  The minimum separation

between wiring and movable controls must be at least 1/2 inch when the

bundle is displaced by light hand pressure in the direction of the controls.



I take this to mean that if your wire bundle is passing through the same

lightening holes as your flight controls it should be clamped in such a way

it won't touch the edges of the lightening holes or come close to movable

flight controls.  The cable should not move any more than 1/2" with light

hand pressure between any two clamps.



Noel

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p.mulwitz(at)worldnet.att
Guest

Posted: Thu Jun 29, 2006 7:03 am Post subject: Wing Wiring

I agree that it is very important to keep wiring clear of 

controls.  It is also desirable to keep the wiring from moving a 

great deal - particularly in turbulent conditions.  I don't know that 

1/2 inch is an achievable goal for the movement of wiring, but I 

believe it is important to keep the movement limited so the wire 

bundles don't come in contact with any controls or the wing skin.



I found this a very difficult goal to achieve without using conduit 

for the wiring.  This is compounded by the Tefzel wiring which is 

very slippery and hard to grab onto.  I wound up using waxed lacing 

tape to hold it in place as it is routed through the wing.



Paul

XL fuselage.

do not archive



 	  Quote: 	
		  It does not seem to be a requirement that the bundle not move more 

than 1/2 inch, rather, it seems that the distance from the wire 

bundle to the controls must be at least 1/2 inch at the least 

favorable displacement of both.

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gfmjr_20(at)hotmail.com
Guest

Posted: Thu Jun 29, 2006 7:23 pm Post subject: Wing Wiring

Michael--

Why gamble when youdo not have to.  Keep the control cable holes clear of 

everything except the cable.  It's a relatively easy process to run the 

wiring without going through these control cable holes



George May

601XL 912s----starting to paint

 	  Quote: 	
		  From: "Michael Valentine" <mgvalentine(at)gmail.com>

Reply-To: zenith-list(at)matronics.com

To: zenith-list(at)matronics.com

Subject: Wing Wiring

Date: Wed, 28 Jun 2006 23:36:41 -0400




<mgvalentine(at)gmail.com>



Listers -



Is there anything wrong with having the wiring go through the same

lightening holes that the control cables will run through as long as

they are kept to the edge?  This would include strobe/nav,

taxi/landing, and aileron trim cables (and probably tubing for an

AOA).  Just thought this might be easier than drilling a grommet hole,

but obviously I don't want to interfere with the cables.



Thanks, Michael

Still finishing the first wing.



do not archive



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