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  #21  
Old 05-23-2020, 04:15 PM
greghughespdx's Avatar
greghughespdx greghughespdx is offline
 
Join Date: Nov 2011
Location: Aurora, OR
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Quote:
Originally Posted by Bob Y View Post
Thank you for posting those.

If I may make a point here: To state it plainly and simply, this is exactly why we published the Service Directive. The photos show a pre-failure condition. It's not possible to say how long the unit might take to fail, nor is it possible to say why your servo is in this condition, but this condition is exactly what was predicted and is the first step in the potential series of failure events that caused us to decide to take action. In the safety and risk management world, we call your investigation and discovery a success - It's the SD process working as a preventative measure.

In case people don't take these notifications seriously, this is a great example of why it's important to stay up to date on your service notifications (for any airplane type, not just ours). I'm posting Bob's photos inline here just to make them easier for folks to see. They are good visual examples.

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Van's web site | Instagram | Facebook
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.

Building RV-8A since Sept 2014
Dual AFS 5600, Avidyne IFD 440, Whirlwind 74RV, Superior XP IO-360
VAF build thread - Flickr photo album - Project Facebook page
Aurora, OR (EAA Chapter 105)

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  #22  
Old 05-23-2020, 08:59 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
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Location: Hinckley, Ohio
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Quote:
Originally Posted by Bob Y View Post
Done. And here are photos for any of you that might be interested.
I have looked at your pictures. Your servo and bracket appear clean and maybe lowTT.

How many hours on the airframe?

Any idea how servo rod got bent? Rough ground handling perhaps?
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 750

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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  #23  
Old 05-24-2020, 08:21 AM
Bob Y Bob Y is offline
 
Join Date: Jul 2017
Location: Piedmont, SC
Posts: 302
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Quote:
Originally Posted by Piper J3 View Post
I have looked at your pictures. Your servo and bracket appear clean and maybe lowTT.

How many hours on the airframe?

Any idea how servo rod got bent? Rough ground handling perhaps?
Yes, low TT - about 18 hours. Too bad this SD didn't come out a couple of months earlier, as it would provide more data to analyze this issue. Unfortunately, early April I disassembled the plane for painting. I picked-up the actuator assy. from the painter yesterday to address the SD since it was apart. This was how I found it when I picked it up. So, I can not confirm if it was this way when I removed it from the aircraft. For that matter, this was so discrete of a discrepancy that, for all I know, this could have been bent the day I installed it. Face it, it's been sitting around over two years waiting to be installed, and I could have even bent it day one when I snugged up the jam nut. I just can't say.

I am PRETTY sure the pivot point wasn't contacting the bottom of the tail fairing and that my hole was large enough. And I can guarantee the AST dimensions specified in the PAP were right within range before first flight. Again, this was so discrete of an issue that even if I was doing an inspection it's very likely I would have missed it.

So, yes, it could have been that way from day one, but I believe the take away from this discussion is that it's an issue that can occur.
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N569TT first flight 2/9/2020
#121047
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  #24  
Old 05-24-2020, 12:40 PM
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Piper J3 Piper J3 is offline
 
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I read SD 00001 and pulled tail cone fairings off to inspect. My threaded shaft is perfectly straight at 536TT. Early-on I added a 2nd jam nut to lock the threaded shaft to the square servo actuator. So, I will following the SD and monitor shaft for straightness thru 1000 hours of operation.

I'm wondering if threads are rolled or cut? AN hardware uses rolled threads to prevent stress concentration.

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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 750

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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  #25  
Old 05-24-2020, 01:01 PM
Bob Y Bob Y is offline
 
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Location: Piedmont, SC
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Jim, I know you weren?t the original builder, but see step 2 on page 8 of the original KAI section 11.

https://www.dropbox.com/s/jvj8ysixx3...ttach.pdf?dl=0

This step covers adjusting the aft end of the servo push rod. You?ve got a lot more thread exposed between the rod end yoke and the plastic shoulder of the servo drive rod than I, so would expect yours to be more prone to bending. But the kinematics of that appear to indicate that your pivot point would not drop as low as mine when the rod was fully retracted, thus be less likely to bottom out on the tail fairing than mine. Making me wonder now if I was in fact contacting the bottom of the fairing? Just another observation. I?ll certainly be very watchful of this area when the plane is reassembled.
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N569TT first flight 2/9/2020
#121047
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  #26  
Old 05-24-2020, 01:50 PM
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Piper J3 Piper J3 is offline
 
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Yes, I'm aware of KAI section 11. I elected to add the 2nd jam nut to prevent rotation, vibration, and working of thread in the square actuator. I never run servo to limits - so no jamming at control stops. I have checked trim function apprx 50% more travel up/dwn than used in flight.

I'll keep "tab" on the tab until 1000TT...
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 750

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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  #27  
Old 05-26-2020, 10:06 PM
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Jeff Vaughan Jeff Vaughan is offline
 
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Location: West Chester, Pa
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When I looked from the side it appears to be not bent.
Took it off and WOW it is really bent
166 hrs


https://www.flickr.com/photos/185605.../shares/4b6a0y
https://www.flickr.com/photos/185605.../shares/y235GN
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  #28  
Old 06-02-2020, 12:07 AM
pilotyoung pilotyoung is offline
 
Join Date: Jan 2018
Location: Birmingham, AL
Posts: 252
Default Safety Directive SD-00001

I received my new servo from Ray Allen about a week ago. It was then that I learned I needed to order some parts from Van's also.

I got my parts from Vans today. New tray, F-1287A-1, Bag 2670, and another Bag with the AN315-3R and the Bush-BS 188X 313Xv222 in it. I did not receive any rivets. The new tray has doublers that have to be separated and deburred and then riveted onto the main body of the tray. It seems to me that rivets should have been supplied. I also did not get the rubber gromet that protects the wires from the servo when they go throw the tray. I know there is one on my old tray, but I expected a new one for the new setup. Did anyone get a gromett?

Has anyone else received these items from Van's? If so, did you receive rivets?

Thanks.

John
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John D. Young, RV-12 Owner
Serial Number 120022, N6812Y
Bought it as a flying airplane in Feb. 2018
Just passed 300 hours flight time in RV-12, and 10,000 hours mostly in corporate jets. I am a CFI; CFII; MEI; and a Advanced Ground Instructor, CFIG; and hoping to be able to help new RV-12 owners by doing some transition training for new builders and owners in RV-12's.
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  #29  
Old 06-02-2020, 07:18 AM
Bob Y Bob Y is offline
 
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Location: Piedmont, SC
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No bushings or rivets are provided. Apparently you?re expected to reuse the bushings. And since you?re not the builder, guess you don?t have LP4-3 rivets. Van?s approves the use of solid rivets in place of blind rivets. I actually used solid rivets when I rebuilt mine. You might find someone on your field that has some solid rivets.
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N569TT first flight 2/9/2020
#121047
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  #30  
Old 06-02-2020, 07:25 AM
funflying funflying is offline
 
Join Date: Oct 2006
Location: arvada, co
Posts: 502
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Hello John,
My order from Ray Allen and Vans was exactly like yours. I wanted to change the plug from the micro molex to the D-sub style so the Service Directive identified the bag needed and the tray replacement due to the fixture on the side that holds the D-sub.
I too checked out the parts and would have liked, and paid for, the plastic grommet that holds the electrical from the servo to the plug. Also the two bushings on the pivot points of the new tray.
Once I get the original parts off, 412 hrs, I will inspect the parts I will need to transfer and determine whether I need to order those parts too.
Now the rivets for me was no issue as I had plenty available, and used solid rivets like Bob Y. I can see where the new tray would need those rivets to complete and supplying the 4 needed makes sense. IMHO
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Last edited by funflying : 06-02-2020 at 07:31 AM.
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