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Question on Control Cables & FAB

 
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hotwheels



Joined: 01 Jun 2007
Posts: 240
PostPosted: Mon Aug 24, 2009 12:38 pm    Post subject: Question on Control Cables & FAB Reply with quote
FF3-2 (rev0): What torque to set for AN316-7R nuts? These are used to hold the various control cables to their respective mounting brackets.

FF-FAB Figure 2: "Securing the Control Cable" shows the alt air cable as "route to panel". Where have others routed it through the firewall? Any photos?

Thanks in advance to anyone who responds...

Regards,
Jay

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johngoodman



Joined: 18 Sep 2006
Posts: 530
Location: GA
PostPosted: Tue Aug 25, 2009 5:31 pm    Post subject: Re: Question on Control Cables & FAB Reply with quote
It's a 7/16th inch thread, so look up the torque numbers in the tables.
John

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hotwheels



Joined: 01 Jun 2007
Posts: 240
PostPosted: Wed Aug 26, 2009 10:20 am    Post subject: Re: Question on Control Cables & FAB Reply with quote
Thanks for the reply.

Here's why I asked the question:

The table in Vans RV-10 General Info Section 5 calls out AN7... 450-500 in-lbs. The Lycoming Service Table of Limits SSP1776 doc Table I, "Bolts, Screws and Nuts", page 1-37 calls out 7/16...600 in-lbs. 150 in-lbs difference is quite a spread.

I may just split the difference and call it good.

Regards,
Jay

johngoodman wrote:
It's a 7/16th inch thread, so look up the torque numbers in the tables.
John


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johngoodman



Joined: 18 Sep 2006
Posts: 530
Location: GA
PostPosted: Wed Aug 26, 2009 11:35 am    Post subject: Re: Question on Control Cables & FAB Reply with quote
Jay,
Just to muddy the water a little (g), The Standard Aircraft Handbook table on page 160 Shows 450-500 inch-pounds for a 7/16-20 with an AN315 nut, while an AN316 Shear Nut is only 270-300 inch-pounds. I believe you are tightening an AN316, right?
Also, Coarse thread 7/16-14 are even less, but I'm pretty sure yours is -20.
John

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hotwheels



Joined: 01 Jun 2007
Posts: 240
PostPosted: Thu Aug 27, 2009 6:31 am    Post subject: Re: Question on Control Cables & FAB Reply with quote
Thanks John. Differences between the tables make perfect sense once thread count is taken into consideration.

The control cables all use the same AN316 nuts. Don't know if they are shear nuts however.

Just fyi that if you ordered Vans throttle quadrant, you'll need extra -43 lock washers as they only include enough for the FWF ends.

Regards,
Jay
johngoodman wrote:
Jay,
Just to muddy the water a little (g), The Standard Aircraft Handbook table on page 160 Shows 450-500 inch-pounds for a 7/16-20 with an AN315 nut, while an AN316 Shear Nut is only 270-300 inch-pounds. I believe you are tightening an AN316, right?
Also, Coarse thread 7/16-14 are even less, but I'm pretty sure yours is -20.
John


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