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Aileron pushrods

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JL2A

Joined: 07 Apr 2015
Posts: 113
Location: Australia

Posted: Mon Sep 14, 2015 3:43 am Post subject: Aileron pushrods

Can someone educate me - looking at a CJ today and it had two different types of aileron pushrods on it (the final pushrod, attached to aileron itself)



One had the 'fat' ends and a big washer, the other was thin and washer smaller than the diameter of ball bearing.



I have heard of one of these falling off in flight, but don't know which type it was.



Assuming this aircraft is set up correctly, why does the 'fat' one require a big washer (assume it is to prevent the rod coming off if bearing/rod separate) while the thin one does not?

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dougsappllc(at)gmail.com
Guest

Posted: Mon Sep 14, 2015 6:16 am Post subject: Aileron pushrods

Anatole,This is called the #7 pull rod and what you are seeing is simply two different types, thin was used in the earlier models, thick in later.  I personally have never heard on one  "falling off" in flight, but have seen the bearing come out of position, which is the fault of the mechanic (not staking the bearing properly).  The thin #7 pull rods are difficult to find, but the thick are in good supply.   It is often best to replace the bearing when dealing with a repair on the thin pull rod.  We normally have these bearings in stock.  Again, good shop practices must be used to prevent the bearing from slipping out of position and jamming the controls.

Best,

Doug

On Mon, Sep 14, 2015 at 4:44 AM, JL2A <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)> wrote:

[quote]--> Yak-List message posted by: "JL2A" <info(at)flyingwarbirds.com.au (info(at)flyingwarbirds.com.au)>

 

 Can someone educate me - looking at a CJ today and it had two different types of aileron pushrods on it (the final pushrod, attached to aileron itself)

 

 One had the 'fat' ends and a big washer, the other was thin and washer smaller than the diameter of ball bearing.

 

 I have heard of one of these falling off in flight, but don't know which type it was.

 

 Assuming this aircraft is set up correctly, why does the 'fat' one require a big washer (assume it is to prevent the rod coming off if bearing/rod separate) while the thin one does not?

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=447052#447052

 

 

 

 

 

 

 

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JL2A

Joined: 07 Apr 2015
Posts: 113
Location: Australia

Posted: Tue Sep 15, 2015 2:26 am Post subject: Re: Aileron pushrods

Thanks Doug, there was one in Adelaide (Oz) that was reported to have lost control rod off one aileron due to the washer not being in place. All hangar talk, but wondering why the thick one has a washer that would prevent a badly staked bearing coming out, while the thin one has no such protection? Or is the big washer just something someone put on there themselves in light of this story...

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wlannon(at)shaw.ca
Guest

Posted: Tue Sep 15, 2015 9:53 am Post subject: Aileron pushrods

On the subject of CJ6 ailerons,  don't know about Yaks.



Unlike Western design and certification standards the Chinese have not 

incorporated individual aileron static balance requirements.

This is actually not a problem in normal situations where the entire system 

has been assembled correctly as each aileron is counter balanced by it's 

opposite.

The lack of a single cotter pin, etc. in the aileron system could by a 

terminal matter.   An unrestrained fully disconnected aileron could flutter 

violently enough to remove the aileron, or the wing, in seconds.



Walt

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