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Running new lines in a closed wing

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craig(at)craigandjean.com
Guest

Posted: Tue Sep 18, 2007 9:19 am Post subject: Running new lines in a closed wing

The wings are closed in the second-hand 601XL kit I bought. The original

builder ran the Pitot/static lines and wires for the landing lights. The

existing wires run through grommeted holes in the ribs. But I'm adding

strobes, nav lights and an AOA probe. The AOA probe is like the AFS probe

with flush ports in the upper and lower wing surfaces near the tip

(www.advanced-flight-systems.com/Products/AOA/aoa.html). So I don't need

access to the middle of the wing, just a way to run wires and Tygon from the

root to the tip.



So how do I run the new lines? I've thought of a number of approaches:



- just lay the lines through the lightening holes and let them flap around

(semi-serious)

- lay conduit through the lightening holes and only clamp it at the ends.

- like above but add an inspection port in the middle of the wing's bottom

surface to allow a third clamp for the conduit in the middle.

- remove the existing wires and use an electricians 5 foot drill extension

from both ends to enlarge holes to support conduit.

- open the skins.



Comments? Other approaches? If I open the skins can it be done without

having to re-jig the wing?



-- Craig

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Gig Giacona

Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA

Posted: Tue Sep 18, 2007 10:59 am Post subject: Re: Running new lines in a closed wing

You should have once access point at the aileron bell-crank. You might be able to reach far enough in there to put some sort of clamp on the bundle.



I'd add another access somewhere else and do the same.



This is assuming that you don't have wing lockers that you are going around. 



 	  craig(at)craigandjean.com wrote: 	
		  The wings are closed in the second-hand 601XL kit I bought. The original

builder ran the Pitot/static lines and wires for the landing lights. The

existing wires run through grommeted holes in the ribs. But I'm adding

strobes, nav lights and an AOA probe. The AOA probe is like the AFS probe

with flush ports in the upper and lower wing surfaces near the tip

(www.advanced-flight-systems.com/Products/AOA/aoa.html). So I don't need

access to the middle of the wing, just a way to run wires and Tygon from the

root to the tip.



So how do I run the new lines? I've thought of a number of approaches:



- just lay the lines through the lightening holes and let them flap around

(semi-serious)

- lay conduit through the lightening holes and only clamp it at the ends.

- like above but add an inspection port in the middle of the wing's bottom

surface to allow a third clamp for the conduit in the middle.

- remove the existing wires and use an electricians 5 foot drill extension

from both ends to enlarge holes to support conduit.

- open the skins.



Comments? Other approaches? If I open the skins can it be done without

having to re-jig the wing?



-- Craig

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_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR

craig(at)craigandjean.com
Guest

Posted: Tue Sep 18, 2007 11:17 am Post subject: Running new lines in a closed wing

 	  Quote: 	
		   This is assuming that you don't have wing lockers that you are going

around. 
	




Nope, no wing lockers so the lightening holes are available. Now adding wing

lockers would get me some access in to the wing's interior but they are

pretty close to the root.



I've considered the crank access hole but it is pretty small to work

through. I think I'd need an arthroscopic surgeon to do the work. Dred is

used to working in small places but I think he uses both hands.



-- Craig

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dredmoody(at)cox.net
Guest

Posted: Tue Sep 18, 2007 11:27 am Post subject: Running new lines in a closed wing

I confess that I made significantly larger aileron bellcrank access ports. But then again, I do work on the back end of third molars.



Dred

Do Not Archive



---- Craig Payne <craig(at)craigandjean.com> wrote: 

 	  Quote: 	
		   

 

 > This is assuming that you don't have wing lockers that you are going

 around. 

 

 Nope, no wing lockers so the lightening holes are available. Now adding wing

 lockers would get me some access in to the wing's interior but they are

 pretty close to the root.

 

 I've considered the crank access hole but it is pretty small to work

 through. I think I'd need an arthroscopic surgeon to do the work. Dred is

 used to working in small places but I think he uses both hands.

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Gig Giacona

Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA

Posted: Tue Sep 18, 2007 12:31 pm Post subject: Re: Running new lines in a closed wing

My bell-crank access points are large. I made the same mistake twice.



But for this you really won't need access to them after you do the original install so there isn't a problem with doing as many as you need and riveting the cover on them.

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601XL Under Construction
See my progress at www.peoamerica.net/N601WR

Ron Lendon

Joined: 10 Jan 2006
Posts: 685
Location: Clinton Twp., MI

Posted: Tue Sep 18, 2007 8:13 pm Post subject: Re: Running new lines in a closed wing

Craig,



I am just about to close up my left wing.  It has all the stuff in it you are planing and has been rotated several times.  I think you could remove the top leading edge skin and top wing skin as long as you have a good flat table to check the wing you should be able to take it apart and put it back together.



Punch the rivet centers back then just take the heads off with a sharp drill.



I would want to check the wings out any way.  Zenith made up a new book this year that shows a method of checking Wing Twist "6w08aa.pdf", it's in the builders photo assembly guide area.



If you find the wing is in good shape just re-wire, plumb and assemble.

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_________________
Ron Lendon
WW Corvair with Roy's Garage 5th bearing
CH 601 XLB
N601LT - Flying
http://www.mykitlog.com/rlendon
Corvair Engine Prints:
https://sites.google.com/site/corvairenginedata/

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