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Date: Thu, 03 Feb 2005 20:39:42 -0500
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
From: CCI <brecab@bellsouth.net>
Subject: Re: [FlyRotary] CCI sandwich mounts.. torque values..
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Hi Dave, You want to use the tension-type nut torque values, that is for AN 
310, 160-190 inch-pounds. Fred, CCI.


At 05:14 PM 2/3/2005, you wrote:
>The oil pan "sandwich" mounts  for the rotary take 3/8" bolts.. Chris and 
>I had it temporarily mounted using hardware store parts, but we elected to 
>use AN bolts to fit it up for the final/working attachment. 3/8 translates 
>to AN6... and we are looking at about AN6-37 for the bottom and AN6-34 for 
>the top mounting holes (this takes into account the plywood aft bulkhead 
>and stainless overlay/firewall, with some fender washers to distribute the 
>force.
>I don't have the CCI paperwork handy.. is there a recommended fastener and 
>torque value for use with those mounts?
>What is an appropriate torque value with AN6 bolts/nuts? I have one 
>reference on hand and want to compare notes. I have the "aviation mechanic 
>handbook" 4th ed by Dale Crane that lists two different torque values: one 
>is "nuts tension torque limits" and is 160-190 INCH pounds, but it also 
>lists a "nut shear torque limit" as well of 95-110 INCH pounds.
>Rather than make a guess here, would someone with the knowledge spell out 
>for me the difference between those two categories?
>Dave Staten
>
>
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