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rowlandcarson(at)gmail.co
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 Posted: Mon Apr 21, 2014 8:32 am Post subject: rudder cable pull test |
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The new inspector for my Europa would like to see the results of a pull test on my rudder cables.
Has anyone done this in UK, and if so, how did you achieve it?
The main lengths of my cables (back to the Graham Singleton bellcrank on the rear bulkhead) are made up and installed in the bonded-on fairleads so I'd have to break something to take them out. Applying 550 lbs tension in-situ without over-stressing anything else could be tricky.
To apply the pull, I am sure that in the past I've seen lever-operated hand winches advertised which can (eg) pull out a tree stump but I can't find anything like that now. Nor can I find spring balances that would read up to about 600 lb for measuring the tension.
Any advice welcome!
in friendship
Rowland
| Rowland Carson ... that's Rowland with a 'w' ...
| <rowlandcarson(at)gmail.com> http://www.rowlandcarson.org.uk
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rowlandcarson(at)gmail.co
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| Posted: Mon Apr 21, 2014 9:51 am Post subject: rudder cable pull test |
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On 21 Apr 2014, at 17:31, Rowland Carson wrote:
| Quote: | Applying 550 lbs tension
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In response to an off-forum reply direct to me, the number comes from the breaking strain of the cable (920 lbs) and the 60% of ultimate load called up in AC43.13-1B:
"7-146. CABLE PROOF LOADS. Cable terminals and splices should be tested for proper strength before installation. Gradually apply a test load equal to 60 percent of the cable-breaking strengths given in table 7-3 and table 7-4, for a period of 3 minutes".
If I can't find any other UK Europa builder who has done this test, my next port of call will be LAA Engineering to see if they can offer some suggestions to my inspector.
in friendship
Rowland
| Rowland Carson ... that's Rowland with a 'w' ...
| <rowlandcarson(at)gmail.com> http://www.rowlandcarson.org.uk
| Skype, Twitter: rowland_carson Facebook: Rowland Carson
| pictures: http://picasaweb.google.com/rowlandcarson
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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tonyrenshaw268(at)gmail.c
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| Posted: Mon Apr 21, 2014 6:00 pm Post subject: rudder cable pull test |
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Hi Rowland,
Can I ask, is the inspector interested in your swaging, because if it meets the swage test, is not asymmetrically pulled up or too stressed over the thimbles, what actually is he after? If he wants proof that the supporting structures are strong enough, such as the rear bulkhead that supports the GS mod, is he interested whether it can withstand the 60 % overload of the designed cable? Anyone able to calculate the aerodynamic load at VMax rudder control deflection..(used to know that), and the max load on the pedal, based on mechanical advantages etc.? Leg pressure must be under 100 lbs, which I base on large aircraft being a max of 80 lbs as I recall, so it all seems a bit much to expect.
To me, its academic if the swaging is appropriate, the structure of the bulkheads is well made, and the correct sized cable is used. Is he within his power to expect such things? Maybe time to change inspectors if you can 
Regards
Tony Renshaw
On 22 Apr 2014, at 3:49 am, Rowland Carson <rowlandcarson(at)gmail.com> wrote:
| Quote: |
On 21 Apr 2014, at 17:31, Rowland Carson wrote:
> Applying 550 lbs tension
In response to an off-forum reply direct to me, the number comes from the breaking strain of the cable (920 lbs) and the 60% of ultimate load called up in AC43.13-1B:
"7-146. CABLE PROOF LOADS. Cable terminals and splices should be tested for proper strength before installation. Gradually apply a test load equal to 60 percent of the cable-breaking strengths given in table 7-3 and table 7-4, for a period of 3 minutes".
If I can't find any other UK Europa builder who has done this test, my next port of call will be LAA Engineering to see if they can offer some suggestions to my inspector.
in friendship
Rowland
| Rowland Carson ... that's Rowland with a 'w' ...
| <rowlandcarson(at)gmail.com> http://www.rowlandcarson.org.uk
| Skype, Twitter: rowland_carson Facebook: Rowland Carson
| pictures: http://picasaweb.google.com/rowlandcarson
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| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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cakeykev(at)gmail.com
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| Posted: Mon Apr 21, 2014 6:33 pm Post subject: rudder cable pull test |
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Years ago and not for a Europa I had to have some microlight cables checked. I used a yacht rigging place on the Isle of Wight.
www.spencerrigging.co.uk/
Specializes in all types of yacht rigging plus commercial rigging for architects andrigging consultant. Based in Cowes ...
Kevin Challis
G ODJG
On 21 Apr 2014, at 18:49, Rowland Carson <rowlandcarson(at)gmail.com (rowlandcarson(at)gmail.com)> wrote:
[quote]--> Europa-List message posted by: Rowland Carson <rowlandcarson(at)gmail.com (rowlandcarson(at)gmail.com)>
On 21 Apr 2014, at 17:31, Rowland Carson wrote:
| Quote: | Applying 550 lbs tension
|
In response to an off-forum reply direct to me, the number comes from the breaking strain of the cable (920 lbs) and the 60% of ultimate load called up in AC43.13-1B:
"7-146. CABLE PROOF LOADS. Cable terminals and splices should be tested for proper strength before installation. Gradually apply a test load equal to 60 percent of the cable-breaking strengths given in table 7-3 and table 7-4, for a period of 3 minutes".
If I can't find any other UK Europa builder who has done this test, my next port of call will be LAA Engineering to see if they can offer some suggestions to my inspector.
in friendship
Rowland
| Rowland Carson ... that's Rowland with a 'w' ...
| <rowlandcarson(at)gmail.com (rowlandcarson(at)gmail.com)> http://www.rowlandcarson.org.uk
| Skype, Twitter: rowland_carson Facebook: Rowland Carson
| pictures: http://picasaweb.google.com/rowlandcarson
= Archive Search & Download, 7-Day Browse, Chat, FAQ,
a-List">http://www.matronics.com/Navigator?Europa-List
_==========================; &nbp; --> http://forums.matroni===================================================http://www.matronics.com/contr============================================
[b]
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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tennant
Joined: 19 Apr 2011
Posts: 121
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| Posted: Tue Apr 22, 2014 5:56 am Post subject: Re: rudder cable pull test |
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Rowland,
May I suggest that the AC 43.13-1B does not really apply to your Europa.
The title:
"43.13-1B - Acceptable Methods, Techniques, and Practices - Aircraft Inspection and Repair [Large AC. This includes Change 1.]"
Note the "Large AC", which I take to mean Large Aircraft. I do not think that the Europa constitutes a Large Aircraft where the loading on components is much higher.
Also the Description
This advisory circular (AC) contains methods, techniques, and practices acceptable to the Administrator for the inspection and repair of nonpressurized areas of civil aircraft, only when there are no manufacturer repair or maintenance instructions. This data generally pertains to minor repairs. The repairs identified in this AC may only be used as a basis for FAA approval for major repairs. The repair data may also be used as approved data, and the AC chapter, page, and paragraph listed in block 8 of FAA form 337 when:
a. the user has determined that it is appropriate to the product being repaired;
b. it is directly applicable to the repair being made; and
c. it is not contrary to manufacturer’s data."
May I suggest that you ask Europa how you should test the system as they have specified the diameter and type of cable etc. This should remove the necessity to use this standard completely.
Good luck with this.
Barry
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
Barry Tennant
D-EHBT
At EDLM - Germany |
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