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  #11  
Old 01-23-2023, 08:00 PM
greghughespdx's Avatar
greghughespdx greghughespdx is offline
 
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Quote:
Originally Posted by seagull View Post
Is this forum the new “official” way to get SB notifications? I used to get them via email until mid-last year.
We still send emails to those owners with aircraft that apply to a given SB or SL. We post them to the Service Information area of our website first (and that is the "Official" location for notifications, BTW), and email notifications are sent after. If you're not getting notifications that you think you should via email, please drop me an email (greg at vans aircraft dot com) with your email address and serial number. I can take a look.
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Last edited by greghughespdx : 01-23-2023 at 08:35 PM.
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  #12  
Old 01-24-2023, 08:43 PM
Bob Y Bob Y is online now
 
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Greg, I see the KAIs associated with these SBs have been posted. It doesnít appear the changes for SB-00067 - Reinforcement of the WD-1223 Counterbalance Arm, have been incorporated into section 11. Is this an omission, or is there a reason this modification isnít required for new builds, or am I missing something?
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  #13  
Old 01-25-2023, 04:04 AM
bobnoffs bobnoffs is offline
 
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i read earlier in this thread that the counterbalance can be removed from inside the tailcone. is this the complete assembly or just the counterweights?
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  #14  
Old 01-25-2023, 05:30 AM
rgmwa rgmwa is offline
 
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The SB-00067 instructions refer to the 11iS KAI’s for balancing the stabilator. I have a Classic 12 which had no requirement to balance the stabilator. Would someone mind posting the relevant page from the iS plans? Also can the stabilator be balanced on the plane if the stab is not removed for the upgrade?
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  #15  
Old 01-25-2023, 05:54 AM
thiggins thiggins is offline
 
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Default Stabilator section 11

Stabilator section 11
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  #16  
Old 01-25-2023, 06:56 AM
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Quote:
Originally Posted by rgmwa View Post
Also can the stabilator be balanced on the plane if the stab is not removed for the upgrade?
I believe itís possible, if you donít mind a few trips in and out of the tail cone. Youíll most likely have to remove mass from the counter weight, which will require removing them from the arm. If you didnít remove enough, youíll be going in and out again, and repeating if still not enough was removed. Then youíll likely be adding a few washers from inside the tail cone to fine tune the balance. No doubt this process would give you the best balance since the AST arm and servo would be in the system exactly as intended vs. a bench simulation. If you performed SB-00053, youíll have a good understanding of the effort to accomplish from inside the tail cone.
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  #17  
Old 01-25-2023, 07:13 AM
rgmwa rgmwa is offline
 
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Thanks for the plans Tim. There must be a lot of 12's flying whose builders weren't aware of this more recent requirement. I wonder how critical it is. Maybe Greg could comment?

Bob - thanks. Yes, I've made that trip a few times. This job won't be much fun either way.
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  #18  
Old 01-25-2023, 07:36 AM
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Quote:
Originally Posted by rgmwa View Post
I wonder how critical it is.
The first sentence of the first note indicates itís an optional process. Youíve apparently flown for some time now without having done it, so youíd be in a good position to evaluate how much effort youíve had to make to manually hold trim. I balanced mine before my first flight so have no frame of reference.
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  #19  
Old 01-25-2023, 08:04 AM
rgmwa rgmwa is offline
 
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It may be more of an issue in the rare event of a cable breaking when you may be relying on trim to control the plane. I'm guessing a more balanced stabilator may make this easier. I've never had a problem with the trim, but like you I don't have another frame of reference either.

Edit: As you say, the plans make balancing an option so it can’t be that critical. For those who did balance how much length did you have to take off the weights?
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  #20  
Old 01-25-2023, 03:07 PM
AeroDog AeroDog is offline
 
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I must be misunderstanding the time allotment to accomplish this. It indicates that 1.5 hours is required to disconnect all cables, remove the stabilator, install the parts and rebalance, reinstall the stabilator, reconnect the cables and set the tensions. Was the time a misprint?

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