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Split elevator on my plane, with Picture.

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Doug Doty

Joined: 28 Oct 2011
Posts: 33
Location: Madison In

Posted: Sun Nov 27, 2011 4:00 pm Post subject: Split elevator on my plane, with Picture.

I wanted to start a different thread as I realized this was hijacking the flying with a level thread that is so interesting in itself. Sorry !!!



Any way I got the tail cone off this evening and looked for looseness, none found ?? I worked the two sides against one another and simply cannot find any movement. It seems to me that it has always been this way or has  twisted over time. The plane has about 1990 hours on the airframe and no known previous damage history. I will post a picture below that demonstrates the right side up as the left is leveled with the HS. Any additional thoughts from anyone on this. I measured the differential with a digital level on each elevator inboard and outboard with with a slight up preload on each and the right is .8 degrees off from the left.

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_________________
1977 AA5B N28454, Fuel Totalizer, Lopresti Nose, Red Rudder Cap, 4 cyl. egt, stock otherwise.

jwellum(at)AOL.COM
Guest

Posted: Sun Nov 27, 2011 5:44 pm Post subject: Split elevator on my plane, with Picture.

Are the trailing edges of the elevators lined up with each  other?

  

  

  

  

  In a message dated 11/27/2011 6:03:45 P.M. Central Standard Time,  39marinette(at)gmail.com writes:

  	  Quote: 	
		  -->    TeamGrumman-List message posted by: "Doug Doty"    <39marinette(at)gmail.com>



I wanted to start a different thread as I    realized this was hijacking the flying with a level thread that is so    interesting in itself. Sorry !!!



Any way I got the tail cone off this    evening and looked for looseness, none found ?? I worked the two sides against    one another and simply cannot find any movement. It seems to me that it has    always been this way or has  twisted over time. The plane has about 1990    hours on the airframe and no known previous damage history. I will post a    picture below that demonstrates the right side up as the left is leveled with    the HS. Any additional thoughts from anyone on this. I measured the    differential with a digital level on each elevator inboard and outboard with    with a slight up preload on each and the right is .8 degrees off from the    left.



--------

1977 AA5B N28454, Fuel    Totalizer, Lopresti Nose, Red Rudder Cap, 4 cyl. egt, stock    otherwise.





Read this topic online    here:



http://forums.matronics.com/viewtopic.php?p=359496#359496

	


 [quote][b]

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Doug Doty

Joined: 28 Oct 2011
Posts: 33
Location: Madison In

Posted: Sun Nov 27, 2011 6:30 pm Post subject: Re: Split elevator on my plane, with Picture.

No they are off by the .8 degrees I mentioned as checked with a digital level.

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_________________
1977 AA5B N28454, Fuel Totalizer, Lopresti Nose, Red Rudder Cap, 4 cyl. egt, stock otherwise.

teamgrumman(at)yahoo.com
Guest

Posted: Mon Nov 28, 2011 11:24 am Post subject: Split elevator on my plane, with Picture.

there will be enough drag in the torque tube/collar that it will be nearly impossible to tell.  Grab the tip that is too high and force it down until the elevator turns in its mount and centers on the horizontal.  It will turn.  The tips should be the same, side-to-side.

       From: Doug Doty <39marinette(at)gmail.com>

 To: teamgrumman-list(at)matronics.com 

 Sent: Sunday, November 27, 2011 4:00 PM

 Subject: Split elevator on my plane, with Picture.

 --> TeamGrumman-List message posted by: "Doug Doty" <39marinette(at)gmail.com (39marinette(at)gmail.com)>

I wanted to start a different thread as I realized this was hijacking the flying with a level thread that is so interesting in itself. Sorry !!!

Any way I got the tail cone off this evening and looked for looseness, none found ?? I worked the two sides against one another and simply cannot find any movement. It seems to me that it has always been this way or has  twisted over time. The plane has about 1990 hours on the airframe and no known previous damage history. I will post a picture below that demonstrates the right side up as the left is leveled with the HS. Any additional thoughts from anyone on this. I measured the differential with a digital level on each elevator inboard and outboard with with a slight up preload on each and the right is .8 degrees off from the  left.

--------

1977 AA5B N28454, Fuel Totalizer, Lopresti Nose, Red Rudder Cap, 4 cyl. egt, stock otherwise.

Read this topic online here:

http://forums.matronics.cop;    * AeroElectric http://www.matronics.com/contribut===============

 [quote][b]

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Doug Doty

Joined: 28 Oct 2011
Posts: 33
Location: Madison In

Posted: Mon Nov 28, 2011 6:49 pm Post subject: Re: Split elevator on my plane, with Picture.

Gary, 



I have put a lot of pressure on it and when it started creeking and sounding scary I quit, but I would be willing to guess that 1/3 to 1/4 of the offset appeared to be gone after doing this but wow wee it is tight in the coupling if that is where it actually moved and I still think it just took a temporory flex set while I was putting pressure on it. What is the diffinative way to tell if it has always been this way or worn. I want to know !!  for now and fix if worn or wait until annual if not. Should I pull the bolts and inspect the holes or is this the right path.

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_________________
1977 AA5B N28454, Fuel Totalizer, Lopresti Nose, Red Rudder Cap, 4 cyl. egt, stock otherwise.

teamgrumman(at)yahoo.com
Guest

Posted: Mon Nov 28, 2011 7:25 pm Post subject: Split elevator on my plane, with Picture.

Yes, I know it's scary.  In fact, there is a chance you'll watch the skin on the elevator wrinkle, but it isn't permanent.  

If it moves at all, then at some point, the hole has crowded out.  Mark both collars/torque tubes with a pencil so you know which one moved.  Like I said, odds are, it's the right one.  

Alternately, you could loosen/remove both nuts and with just the bolt holding it in place, see which one is moving.  Unless you feel comfortable forcing the elevator against the stop, this might be your best best.  

When I noticed the right side of mine was sloppy, I just redid both of  them.

Get some big spring clamps to hold the elevator tip square with the horizontal.  Clamp only on the edge of the outboard most rib on the horizontal.  It won't take much to hold it in place.  A really long ream works the best.  It will be difficult working around the trim screw jack.  

When you ream it, go very slowly and let the ream do the centering.  If you can get a piloted ream, that will help guide you through the other side easier.  

Or, fly it to Auburn and I'll fix it.  [grin]

       From: Doug Doty <39marinette(at)gmail.com>

 To: teamgrumman-list(at)matronics.com 

 Sent: Monday, November 28, 2011 6:49 PM

 Subject: Re: Split elevator on my plane, with Picture.

  

 --> TeamGrumman-List message posted by: "Doug Doty" <39marinette(at)gmail.com (39marinette(at)gmail.com)>



Gary, 



I have put a lot of pressure on it and when it started creeking and sounding scary I quit, but I would be willing to guess that 1/3 to 1/4 of the offset appeared to be gone after doing this but wow wee it is tight in the coupling if that is where it actually moved and I still think it just took a temporory flex set while I was putting pressure on it. What is the diffinative way to tell if it has always been this way or worn. I want to know !!  for now and fix if worn or wait until annual if not. Should I pull the bolts and inspect the holes or is this the right path.



--------

1977 AA5B N28454, Fuel Totalizer, Lopresti Nose, Red Rudder Cap, 4 cyl. egt, stock otherwise.





Read this topic online  here:



http://forums.matronics.com/viewtopic.php?p=359612#359612www.aeroelectric.com[b]http



 

 

  

 [quote][b]

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Doug Doty

Joined: 28 Oct 2011
Posts: 33
Location: Madison In

Posted: Mon Nov 28, 2011 7:58 pm Post subject: Re: Split elevator on my plane, with Picture.

That was some great additional help, thanks, I am back in town the rest of the week and it is raining kittys and puppies here so I'll go out and work on it tomorrow eve. I will use your advice to dig in deeper and come up with the answer, I think I will call Garner tomorrow to get the bolts coming and order the most suitable reamer I can find afterwards and have it modified for piloting duty if unavailable otherwise. 



I'll give an update once I get it sorted out.



I can't help but be curious but I would guess that the right elevator is typically deflected down when they are worn as a result of the rotational forces of the air coming off the prop loading it heavier  ???

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_________________
1977 AA5B N28454, Fuel Totalizer, Lopresti Nose, Red Rudder Cap, 4 cyl. egt, stock otherwise.

flyv35b(at)minetfiber.com
Guest

Posted: Tue Nov 29, 2011 6:31 am Post subject: Split elevator on my plane, with Picture.

On 11/28/2011 6:49 PM, Doug Doty wrote:

 	  Quote: 	
		   



 Gary,



 I have put a lot of pressure on it and when it started creeking and sounding scary I quit, but I would be willing to guess that 1/3 to 1/4 of the offset appeared to be gone after doing this but wow wee it is tight in the coupling if that is where it actually moved and I still think it just took a temporory flex set while I was putting pressure on it. What is the diffinative way to tell if it has always been this way or worn. I want to know !!  for now and fix if worn or wait until annual if not. Should I pull the bolts and inspect the holes or is this the right path.



 --------

 1977 AA5B N28454, Fuel Totalizer, Lopresti Nose, Red Rudder Cap, 4 cyl. egt, stock otherwise.





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=359612#359612



I'd say if both bolts were loose and you couldn't move it that it was 
	


made that way.  I've seen quite a few that were not loose but not 

aligned either.



Cliff

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