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SSDiv6 · 08-28-2013, 12:54 AM

There is no SFI Foundation specifications or testing criteria for the tethers.
Therefore, I assume it is up to NHRA to approve any solution for compliance with the rule.

A similar design to the one they offer can use an aerospace band clamp that meets Military Specification MS21920.
There are several vendors for these clamps in various sizes:

http://www.herberaircraft.com/pdf/Ot...20bulletin.PDF

http://www.clampco.com/products/products.asp

As regards to the cable and ends, they can also be procured from a few companies and it would require the swaging crimping tool and gauge.
Some sources for the cable, ends and tools are as follows:

http://www.mcfarlane-aviation.com/Pr...?CategoryID=47

http://www.aircraftspruce.com/catalo...ntrolcable.php

For guidance on assembling, strength requirements and testing the cable, I suggest checking out the FAA Mechanics Handbook and read Section 2-41 of the handbook and on. The link for the handbook is as follows:

http://www.faa.gov/regulations_polic...frame_vol1.pdf

Additional specification, assembly and testing guidance can also be found at the following link:

http://thecableconnection.com/cable-specification.html

I believe if you document the cable assembly, show load testing that meets the FAA guidance and requirements as objective evidence, NHRA should approve it.
Control cable assemblies are used in commercial and private aircraft in a daily basis and I do not believe the threshold is higher for retaining a header collector in the event it comes loose.

They also claim a "Patent Pending", well the concept, system and design is not patentable. A patent search will show many of the same concepts and ideas with patents.

Since it appears that Collector Tethers is a sponsor of this site, I do not know how long this message will last.

08-28-2013, 12:54 AM	#4
SSDiv6 VIP Member Join Date: Feb 2003 Location: Glendale, Arizona Posts: 3,045 Likes: 712 Liked 1,603 Times in 583 Posts	Re: You got to be kidding? There is no SFI Foundation specifications or testing criteria for the tethers. Therefore, I assume it is up to NHRA to approve any solution for compliance with the rule. A similar design to the one they offer can use an aerospace band clamp that meets Military Specification MS21920. There are several vendors for these clamps in various sizes: http://www.herberaircraft.com/pdf/Ot...20bulletin.PDF http://www.clampco.com/products/products.asp As regards to the cable and ends, they can also be procured from a few companies and it would require the swaging crimping tool and gauge. Some sources for the cable, ends and tools are as follows: http://www.mcfarlane-aviation.com/Pr...?CategoryID=47 http://www.aircraftspruce.com/catalo...ntrolcable.php For guidance on assembling, strength requirements and testing the cable, I suggest checking out the FAA Mechanics Handbook and read Section 2-41 of the handbook and on. The link for the handbook is as follows: http://www.faa.gov/regulations_polic...frame_vol1.pdf Additional specification, assembly and testing guidance can also be found at the following link: http://thecableconnection.com/cable-specification.html I believe if you document the cable assembly, show load testing that meets the FAA guidance and requirements as objective evidence, NHRA should approve it. Control cable assemblies are used in commercial and private aircraft in a daily basis and I do not believe the threshold is higher for retaining a header collector in the event it comes loose. They also claim a "Patent Pending", well the concept, system and design is not patentable. A patent search will show many of the same concepts and ideas with patents. Since it appears that Collector Tethers is a sponsor of this site, I do not know how long this message will last. Last edited by SSDiv6; 08-28-2013 at 12:59 AM.