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Bell 212 cyclic position


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#1 Agog

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Posted 25 July 2019 - 06:29

Hello,

 

We have just acquired a Bell 212.

 

Was curious as to why the cylic is always 'stuck' fully forward and fully right until after starting engines and the hydraulic systems are pressurised.

 

Thanks



#2 kona4breakfast

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Posted 25 July 2019 - 12:35

Ours is sometimes like that, usually if the mechanics did a 25 hr and greased the head. It shouldn't be stuck though. I put it back to neutral before I start it.


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#3 Agog

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Posted 26 July 2019 - 22:52

Thanks for all of the replies.

 

I think it must be the darn great swashplate spring. With engines off, when I depress the FTR, I am actually able to manhandle the cyclic back to a centred position, and all is now right with the world.

 

Apart from me wondering what is the function of the spring...


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#4 superstallion6113

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Posted 01 August 2019 - 07:07

Thanks for all of the replies.

 

I think it must be the darn great swashplate spring. With engines off, when I depress the FTR, I am actually able to manhandle the cyclic back to a centred position, and all is now right with the world.

 

Apart from me wondering what is the function of the spring...

 

The spring on the the swashplate is the swashplate balance spring. It can and usually does pull the controls when static, at least it did on the 212s I worked on. When rigging the controls on a 212, the spring is required to still have tension when the fwd/rh horn is at it's lowest level, so it will never not have tension on it. 


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#5 TwinHuey

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Posted 30 September 2019 - 12:47

I was taught the swashplate spring is on both 205/212 to assist in hydraulic off forces. The rotor system will give you feedback ( aft cyclic ) and the dissymmetry of lift would tilt the rotor slightly to the left, so that spring is designed to hold it FWD / RIGHT. 

 

Dual HYD off in 212 is against the RFM, but we train it in the 205 since many models are single HYD and its not terrible. 


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