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Old 05-09-2012, 10:47 AM
az_gila's Avatar
az_gila az_gila is offline
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 9,314

Take off the fiberglas fairing and repeat.

Since the owner is not the builder, the horizontal stab mount might have slightly oversize holes, and if the mounting bolts are not up to full torque, some slippage could occur.

Re-torque all of the mounting bolts anyway...

Patrick K,

Don't try your lift it by the tail trick on a Grumman either...
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ

Last edited by az_gila : 05-09-2012 at 10:49 AM.
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Old 05-09-2012, 10:54 AM
pvalovich pvalovich is offline
Join Date: Dec 2005
Location: Ridgecrest, CA
Posts: 388
Default Check for Fiberglass Fairing Interference

I encountered a similar thing as I was finishing my first annual. Couldn't figure out where the clicking sound was coming from on the right elevator. Then I realized I hadn't completely attached the emp fairing and the lower right tab wasn't properly positioned. Completed attaching fairing and sound went away.
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Old 05-09-2012, 01:52 PM
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flion flion is offline
Join Date: Dec 2007
Location: Flagstaff, AZ
Posts: 2,469

Ok, I get the asymmetrical load thing but I still think that an aircraft rated for aerobatic G-loads should be less touchy than that. Granted, most of the forces are at the wing spar. And I am guilty of horsing a Cessna around by the tail but I've never seen one fail or even be loose. Many of these were flight school aircraft (Sierra Academy), so the maintenance wasn't the best and the airframe hours were high. I don't push the tail on my RV (love my bogie bar), but I am confident it is solid enough to take it if I needed to; I recheck the attachment every annual or if the fairing gets removed for any reason.

And so I stand corrected about the fairing. I don't think I could get enough movement out of my tail to make the fairing cause a sound, but if others are experiencing it, it is worth checking out.
Patrick Kelley - Flagstaff, AZ
RV-6A N156PK - Flying too much to paint
RV-10 14MX(reserved) - Fuselage on gear
EAA Technical Counselor #5357
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Old 05-09-2012, 06:39 PM
Join Date: Mar 2008
Location: Seattle
Posts: 1,364

The damage caused by lifting or pushing on the horizontal stab is frequently a squeezed leading edge.
Most people don't think about centering the force on the spar. So the leading edge skin takes most of the abuse.
It leaves an ugly spot!
Scott Emery
EAA 668340, chapter 326 & IAC chapter 67
RV-8 N89SE first flight 12/26/2013
Yak55M, and the wife has an RV-4
There is nothing-absolute nothing-half so much worth doing as simply messing around with Aeroplanes
(with apologies to Ratty)
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Old 05-10-2012, 12:11 AM
reconaviator reconaviator is offline
Join Date: Dec 2011
Location: Rocklin
Posts: 29

Thank you all for your inputs, this website and forum is awesome.

I am going back out to the airport to re inspect. Just to clarify I have not / do not lift the tail by the stab. I do push it back holding the vertical stab and horizontal stab attempting equal pressure. this is not much force at all though. I have grounded the plane and will get some local a/p and builders to look at it.

As far as I can tell now is to perform 3 things.
1. Torque bolts down
2. Inspect with another person applying light force
3. Perform some type of micro crack investigation, non destructive testing (have no idea about that )

It just seems if things were moving around a visual inspection would reveal it. As I stated before I could find no deformations. The rivets look just a smooth as could be', and nothing on the inside.

I'll post what I find out.

Thanks all !
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Old 05-10-2012, 04:38 PM
reconaviator reconaviator is offline
Join Date: Dec 2011
Location: Rocklin
Posts: 29
Talking Problem Solved

The culprit was the lower trim strip just under the stab on the fuselage. Removing it caused the sound to cease.

Thanks all for the inputs.

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Old 05-10-2012, 04:55 PM
Mike S's Avatar
Mike S Mike S is offline
Senior Curmudgeon
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 14,090

Glad you found the cause, hope there was not a lot of damage to the surface where it was interfering.
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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