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  #11  
Old 03-01-2014, 11:31 AM
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pierre smith pierre smith is offline
 
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Default Certified as well

Both of my certified Air Tractors have the same rod end bearing hinge as Van's and they have locking nuts from the factory.

Best,
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  #12  
Old 03-01-2014, 12:08 PM
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az_gila az_gila is offline
 
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Cool

Quote:
Originally Posted by rvbuilder2002 View Post
.......
My main point is "do not become complacent and assume that just because an AN365 nut has been replaced and is now safetied with a cotter pin, that it is automatically safer".
If you really, really want "belts and braces" then you can use a self-locking castle nut...

http://www.aircraftspruce.com/catalo...es/ms17825.php

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  #13  
Old 03-01-2014, 03:11 PM
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Walt Walt is offline
 
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Default

There have been numerous documented accidents due to a cotter pin that was left out but I can't recall every hearing of a "good" self locking nut departing for no reason.
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  #14  
Old 03-01-2014, 03:48 PM
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Jamie Jamie is offline
 
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Location: Atlanta, GA
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Quote:
Originally Posted by Walt View Post
There have been numerous documented accidents due to a cotter pin that was left out but I can't recall every hearing of a "good" self locking nut departing for no reason.
My thoughts exactly. There is a trade-off. The only way that nut is going to back out is if the bearings in the rod end-bearing fail or something else causes the rod-end bearing to lock up, then rotation could be applied to the nut. But, the rod-end bearings are supposed to be sandwiched between the adjacent tabs (read: tight). If the bearing fails it should be very, very obvious.

But I too have seen many missing lock nuts. Once even on a rental I was going to fly as a newly-minted pilot. It was a 172 and during my walk-around I noticed that there were no cotter pins on any of the castle nuts holding the right aileron on. Turns out the aileron had been pulled so that part of the wing could be inspected -- two weeks prior. Countless students flew that airplane like that.
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  #15  
Old 03-01-2014, 08:55 PM
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Taildrgr Taildrgr is offline
 
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I understand about a cotter pinned nut on a rotating bolt, but why do we use a cotter pin on the bolts that hold the engine mount on?
Just wondering if its because of the tensile load instead of the shear load?
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  #16  
Old 03-01-2014, 11:01 PM
Bevan Bevan is offline
 
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Quote:
Originally Posted by Taildrgr View Post
I understand about a cotter pinned nut on a rotating bolt, but why do we use a cotter pin on the bolts that hold the engine mount on?
Just wondering if its because of the tensile load instead of the shear load?
Probably because fiber nuts are not to be used FWF (temp limits).

Bevan
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  #17  
Old 03-02-2014, 01:10 AM
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RV7A Flyer RV7A Flyer is offline
 
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Quote:
Originally Posted by Bevan View Post
Probably because fiber nuts are not to be used FWF (temp limits).

Bevan
Somebody needs to notify Lycoming, then, because my brand new IO-360 from the factory came with (gasp) fiber locknuts on it (e.g., on the Adel clamps holding the fuel injection lines).

I've heard this before about fiber locknuts FWF, and granted there are places in the engine compartment where they probably shouldn't be used (and I used a lot of all-metal locknuts when installing the systems on the engine), but even the fuel injection servo uses fiber locknuts in one or two places, IIRC.
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  #18  
Old 03-02-2014, 03:41 AM
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plehrke plehrke is offline
 
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Default

Quote:
Originally Posted by Taildrgr View Post
I understand about a cotter pinned nut on a rotating bolt, but why do we use a cotter pin on the bolts that hold the engine mount on?
Just wondering if its because of the tensile load instead of the shear load?
Engine mounts are also a high vibration joint with rubber in the clamp-up stack. Both vibration and movement can work a nut off a bolt unless mechanically restricted with a cotter pin.
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  #19  
Old 03-02-2014, 04:28 AM
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TomVal TomVal is offline
 
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Heck, on my fixed pitched prop, even Sensenich uses self-locking nuts. I was surprised to see this, but that's what their documentation shows.
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  #20  
Old 03-02-2014, 06:44 AM
vic syracuse vic syracuse is offline
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Default Cotter pins

I just inspected an RV-10 yesterday with 100 hours on it and NO cotter pins in any of the 4 engine Lord mount bolts.

If it calls for them, they have to be used.

Vic
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