Safety Directive SD-00001 for RV-12/12iS - Elevator Trim Servo

[greghughespdx]

Originally Posted by AeroDog

Reading the document, it appears that the "low cost" replacement motor for those of us with the older version is limited to those with bent or timed-out units. Mine, on a not-yet-flying airplane, is neither bent nor timed-out. Is it possible for us to get the $90 deal?

Jerre

Good question, thanks for asking. I am told that if you have the older model trim motor on an RV-12/12iS, you can contact Ray Allen Company and ask to arrange the exchange, regardless of condition or hours in service.

[Tony_T]

Just as a matter of interest I'll post some pictures of three servos. These are all the original life limited servos.

Looks Ok ~580 hrs


Looks OK ~300 hrs


Looks bent ~800 hrs

[Piper J3]

Tony -

Is servo with bent threaded rod yours? Any idea how it got bent? Manhandling stabilator or trim tab?

[greghughespdx]

Originally Posted by Tony_T

Just as a matter of interest I'll post some pictures ...
Looks bent ~800 hrs

Would be best to remove and further examine, and then send to Ray Allen for an exchange and so they can take a close look at it.

[Tony_T]

Originally Posted by Piper J3

Tony -

Is servo with bent threaded rod yours? Any idea how it got bent? Manhandling stabilator or trim tab?

Not mine. I do know the completed fuselage for this airplane was shipped across the country. The stab wasn't mounted but the servo and pushrod may have been. Could have been manhandled, but no way to know for sure. Otherwise, the airplane was always hangared and well maintained.

Yes, this one will be removed and sent to Ray Allen for review and replacement.

BTW, if your servo is like these with the rectangular actuator, you can slip a wire gauge like a spark plug gauge between the jam nut and the actuator which will help determine any bend. The gap is about .025 or a little wider.

[NinerBikes]

Thank you so much, Tony, for the the photos as examples.

[Bob Y]

Have any of you tried to make this mod yet? Page 09, step 1 of the latest revision of KAI 11iS/U dated 5/12/20 has you adjust the rod end bearing so the pivot arm length is 16.0?. This dimension was 16-11/16? in the prior revision. The problem I?m having is that it is only 16? from the pivot point to the end of the F-1287F threaded insert for the rod end bearing. So there?s no way to achieve that dimension with the rod end bearing attached. And the part number for the AST push rod has not changed between revisions - still F-1287E.

What am I missing here?

And with about 18 hours on the hobbs, my threaded servo arm was ALREADY bent!!!

Anyone looked at this yet?

[Bob Y]

Ok - per my previous post, I just noticed an inconsistency... The metric dimension shown is 42.39 cm, which is 16-11/16?. So, one is wrong. I?m guessing which one it is, but not sure why the 16-11/16? dimension was changed.

Scott, can you please confirm?

[greghughespdx]

Originally Posted by Bob Y

Ok - per my previous post, I just noticed an inconsistency... The metric dimension shown is 42.39 cm, which is 16-11/16?. So, one is wrong. I?m guessing which one it is, but not sure why the 16-11/16? dimension was changed.

Scott, can you please confirm?

We will check on that dimension when back in the office - thanks for the note.

Can you please send photos of your bent servo rod to support@vansaircraft.com? Would be interested in seeing yours. Thanks!

[Bob Y]

Done. And here are photos for any of you that might be interested.

https://www.dropbox.com/s/n6v0mj4drk...51.26.jpg?dl=0

https://www.dropbox.com/s/5tsatcclfi...53.30.jpg?dl=0