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  #131  
Old 05-10-2016, 10:43 AM
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bruceh bruceh is offline
 
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No cracks. RV-9A with 252 hours.
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  #132  
Old 05-10-2016, 11:04 AM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
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Mine is not quite as clean looking as Bruce's, but 290 hobbs hours and no cracks on my RV-9.
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  #133  
Old 05-10-2016, 11:05 AM
PCHunt PCHunt is offline
 
Join Date: Feb 2007
Location: San Diego, CA
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Quote:
Originally Posted by RV10inOz View Post
RV10
1200 Tach/1400+ hobbs
External inspection no sign of anything. Annual starts this weekend so inside the borescope goes, but it looks good so far.

Is there any sign of what caused this SB, besides the one set of pics in the SB of course?
This is a quote of post #43 in the OTHER thread on this SB. Too bad it is kinda buried:

As airplanes age, issues can crop up that were unforeseen. This is not at all unusual as anyone that has been working on aircraft for a living will tell you.
Boeing has an entire engineering dept. that just works on engineering fixes for problems that show up as aircraft age.

Van's is being proactive in monitoring and reacting as the fleet ages. The issuance of an SB like this may be frustrating, but that is much better than the alternative.


This particular problem was discovered on one of the company demonstrators and was then reported by a couple of customer built airplanes.
At this time, those 3 are the only airplanes with cracks discovered that I know of.

Because of the discovery, a detailed FEA was done on the bracket attach point and a retrofitable reenforcement was developed.

The retrofit was beta installed on two different company demonstrators and by both of the customers that had cracks. The process and install instructions was developed based on that experience.

The bottom line with this SB is that a very small number of cracks have been detected so far. In most instances it likely will take a lot of hrs for cracks to develop (there are airplanes with well over 2000 hrs that have no cracks).
But nothing is for certain.... there can be a lot of different factors that can influence time/cycle based fatigue issues like this (interior hole finish, deburring, how the airplane is flown, etc.)
Because of this, it is possible that many airplanes could go their entire life without ever developing cracks. It is for this reason that it is not recommended this be done on completed/closed up wings. The risk of causing other problems during the install is not worth the risk, if there is not yet a physical reason to install it.

It does make sense to install the mod on wings still under construction.
I believe that kits shipped from this point on will automatically receive the additional parts.

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Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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  #134  
Old 05-10-2016, 11:06 AM
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PerfTech PerfTech is offline
 
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.....My 9-A 850 Hrs. No cracks, but I found some other disturbing issues that we will need to address.
I am glad I did this inspection and found them...
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  #135  
Old 05-10-2016, 11:14 AM
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Crack free per SB at 2.5K but other minor issues discovered.
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Не имей сто рублей, а имей сто друзей.
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  #136  
Old 05-10-2016, 11:15 AM
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RVbySDI RVbySDI is offline
 
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Quote:
Originally Posted by Aggie78 View Post
Steve,

I agree.

On another note, I posted up a message over on the General Discussion forum to drive folks over here.

I was just killing time on a Saturday night and rarely check this part of VAF. Would have been weeks before I'd seen it otherwise.

Pretty important SB to be buried off the main storefront, so I gave a heads-up.

Rob
Rob, I would like to suggest this would not be a problem for you if you were to just click on the "Today's Posts" button on the top left section of the website. By following the VAF forums this way you will see EVERY post that was submitted regardless of which forum thread it was posted into. Saves you from having to manually navigate to any one particular thread to see new posts.

In my case I monitor EVERY new post from EVERY thread this way. Very helpful as I see many topics I would not normally think about reading.
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  #137  
Old 05-10-2016, 12:06 PM
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LettersFromFlyoverCountry LettersFromFlyoverCountry is offline
 
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Quote:
Originally Posted by bruceh View Post

Nothing to see here. Move along. (RV-9A with 252 hours)
That picture puts me to shame. That's a beautiful job of building right there.
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  #138  
Old 05-10-2016, 12:09 PM
727TT 727TT is offline
 
Join Date: May 2016
Location: Granbury TX
Posts: 36
Thumbs up SB results

Inspected with bore scope this morning and no cracks found.......whew....RV7A with 427 hours.
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  #139  
Old 05-10-2016, 12:22 PM
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flyboy1963 flyboy1963 is offline
 
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Location: Lake Country, B.C. Canada
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Default questions about 'the inspection'

so...............questions, before I just stick my arm in there with my cellphone.

#1 - is this assembly completed in a quickbuild wing?

#2 - Is there a 'construction quality' that we should also be looking for?....poorly set rivets, holes not deburred....( not visible tho')

.......or is the crack only possible from heavy repeated loads....whether air or hangar induced!
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  #140  
Old 05-10-2016, 03:09 PM
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Steve Melton Steve Melton is offline
 
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Quote:
Originally Posted by Vlad View Post
Crack free per SB at 2.5K but other minor issues discovered.
some glue will probably fix those minor items.
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