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Countersunk wrong hole, need advice

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rleffler

Joined: 05 Nov 2006
Posts: 680

Posted: Sun Apr 22, 2007 3:47 am Post subject: Countersunk wrong hole, need advice

While starting the horizontal stabilizer for my RV-10 on page 8-2, my attention was diverted and I ended up countersinking an incorrect hole on the rear spar.  Step 2 is the where I made the mistake and countersunk the middle hole (vertically) two holes to the left of the two holes that were supposed to be countersunk.  

   

On Page 11-4, Figure 4, it appears to be the hole that is initially cleco’d on the rear spar to F-101C.  It appears that the top and bottom holes are attached with an AN3 bolt.   I’m having difficulty finding the purpose of this middle hole, other than aligning the spar to match drill the top and bottom holes.  I can’t seem to find the step where it indicates that the cleco comes out and another fastener is used.  

   

So the questions I am attempting to figure out are:  

     What specifically is this hole      used for other than just to initially align the spar for match drilling      the top and bottom holes?    
Will having a countersink be an      issue with the intended purpose of this hole?  
If it is an issue, can I      install a doubler or some other appropriate fix?  
Or am I SOL and need to order      another spar?   

   

   

Thanks,  

   

Bob  

#40684  

   

       [quote][b]

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_________________
Bob Leffler
N410BL - Phase I
http://mykitlog.com/rleffler

Tim Olson

Joined: 25 Jan 2007
Posts: 2872

Posted: Sun Apr 22, 2007 4:10 am Post subject: Countersunk wrong hole, need advice

I do believe your assumptions are correct....it's just for aligning as

far as I can remember, and since countersinking still left you a

reasonable hole for aligning, I wouldn't worry about it today.  It would

be very easy to add a doubler later if you wanted, and you could even

just put in a small #6 or #8 countersunk flat head screw later if you

wanted, just to add a fastener in there.  The doubler might be nice

for piece of mind later, and that would only make things stronger.

So I think you should just relax and carry on and deal with that spot

however you feel best at the time of final empennage attachment.



Tim Olson - RV-10 N104CD - Flying

do not archive

Bob Leffler wrote:

 	  Quote: 	
		   While starting the horizontal stabilizer for my RV-10 on page 8-2, my 

 attention was diverted and I ended up countersinking an incorrect hole 

 on the rear spar.  Step 2 is the where I made the mistake and 

 countersunk the middle hole (vertically) two holes to the left of the 

 two holes that were supposed to be countersunk.

 

  

 

 On Page 11-4, Figure 4, it appears to be the hole that is initially 

 cleco’d on the rear spar to F-101C.  It appears that the top and bottom 

 holes are attached with an AN3 bolt.   I’m having difficulty finding the 

 purpose of this middle hole, other than aligning the spar to match drill 

 the top and bottom holes.  I can’t seem to find the step where it 

 indicates that the cleco comes out and another fastener is used.

 

  

 

 So the questions I am attempting to figure out are:

 

  

 

    1. What specifically is this hole used for other than just to

       initially align the spar for match drilling the top and bottom

       holes? 

    2. Will having a countersink be an issue with the intended purpose of

       this hole?

    3. If it is an issue, can I install a doubler or some other

       appropriate fix?

    4. Or am I SOL and need to order another spar?

 

  

 

  

 

 Thanks,

 

  

 

 Bob

 

 #40684

 

  

 

 *

 

 

 *

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