SB 00067 Complete, Some Notes

[rtlongdon]

Balancing it might be a PITA as the stabilator control cables need to be removed so there is no outside influence on the balance. I'd question how much work you are really saving. It's not terribly hard to pull the stab off IMO.

That being said, usually stuff like this arrives at the same amount of work, just with effort put into different tasks. I pulled my stab and also changed/loctited the bearings and had a great opportunity to inspect a lot of things that are normally not easy to see. Cheers!

[seagull]

The control stick because of its off center pivot loads the control to down elevator. With the cables connected you won’t be able to neutral balance the stabilator. The cables can be removed from the rear outside then go inside to remove the counter balance. You will need several in / out attempts to get the balance correct. In my opinion if you are at the point of removing the tail covers and cables you are only 15 minutes from having the whole assembly off the plane, especially if you have a helper.

[seagull]

The control stick because of its off center pivot loads the control to down elevator. With the cables connected you won’t be able to neutral balance the stabilator. The cables can be removed from the rear outside then go inside to remove the counter balance. You will need several in / out attempts to get the balance correct. In my opinion if you are at the point of removing the tail covers and cables you are only 15 minutes from having the whole assembly off the plane, especially if you have a helper.

I was planning on doing mine from inside but after reading a few reviews decided to do it from outside. I removed the assembly by myself and had a helper to balance and reinstall. The balancing was done by hanging it, not on the plane which was quick and easy.

[D&M Dan]

Can someone tell me where to access 12I KIA Page U-11?
Thanks

[seagull]

Originally Posted by D&M Dan

Can someone tell me where to access 12I KIA Page U-11?
Thanks

https://www.vansaircraft.com/service...isions/11is-u/

Balance procedure is on page 11.

[D&M Dan]

Thanks, completely missed it.

[Mich48041]

It is not necessary to reinstall the stabilator to check its balance.
Instead, hang the stabilator with cord attached to the pivot bolts.
The calculated weight to remove was 448 grams. But the stabilator was
balanced after removing only 400g of lead. The total length of lead removed was 74mm.
The horizontal cord in the picture is holding the AST trim tab up.
The aft end of the AST PUSHROD is resting on bolt per plans page 11iS/U-11.
I will suspend the forward end of the AST PUSHROD with cord for more accurate balancing.

[seagull]

Originally Posted by Mich48041

The aft end of the AST PUSHROD is resting on bolt per plans page 11iS/U-11.
I will suspend the forward end of the AST PUSHROD with cord for more accurate balancing.

I suspended mine from the pivots off the plane for balancing also. I used a postal gram scale to weigh the end of the AST pushrod,then used tire weights of the same weight taped to the AST horn to simulate the AST pushrod.

[gossend]

So I'm still not understanding why balance is so critical. Any response from the Mothership That I might have missed??

[hevansrv7a]

It’s a LSA which thus closely conforms and is not just EAB.
Q1: can owner decide it’s not necessary? Van’s did not call it optional.
Q2: if yes then is necessary to go back to phase one?