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  #51  
Old 05-08-2016, 07:43 PM
simpkinsona simpkinsona is offline
 
Join Date: Dec 2010
Location: Vacaville, CA
Posts: 167
Default No cracks

Inspected this morning. Used flashlight and borescope. No cracks. RV-9a 800 hours.
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  #52  
Old 05-08-2016, 08:05 PM
Aircraft Specialty Aircraft Specialty is offline
 
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Location: Oconomowoc, WI
Posts: 460
Default

Has anyone done an RV-10 with only a borescope and mirror yet? Just curious if this will be possible. I think it should be doable...but without being in front of my plane, it makes it difficult to guess.

Thanks,
Steve
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  #53  
Old 05-08-2016, 09:10 PM
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rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
Default Everyone take a deep breath.......

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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  #54  
Old 05-08-2016, 10:51 PM
scsmith scsmith is offline
 
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Location: Ashland, OR
Posts: 2,573
Default inspection completed

RV-8 with 370 hrs. No cracks.
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  #55  
Old 05-09-2016, 02:42 AM
amekler amekler is offline
 
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Location: Gilford,NH
Posts: 90
Default

there was an rv7 fatal december 2015 in Hurricane, UT . the report says wing separated
is this the basis for the sb?
alan
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  #56  
Old 05-09-2016, 03:07 AM
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rzbill rzbill is offline
 
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Location: Asheville, NC
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Quote:
Originally Posted by amekler View Post
there was an rv7 fatal december 2015 in Hurricane, UT . the report says wing separated
is this the basis for the sb?
alan
Um....No.........Didn't Scott just explain in detail what the basis of the SB was in the post just prior to yours?
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ME/AE '82
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  #57  
Old 05-09-2016, 03:27 AM
s24789 s24789 is offline
 
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Location: Hobe Sound, Florida
Posts: 292
Default

Quote:
Originally Posted by Aircraft Specialty View Post
Has anyone done an RV-10 with only a borescope and mirror yet? Just curious if this will be possible. I think it should be doable...but without being in front of my plane, it makes it difficult to guess.

Thanks,
Steve
Completed the inspection using a borescope yesterday afternoon. It was the only way I could see the rivets. No cracks. Took more time to pull the panels than to inspect the rivets.

Phelps RV-7A
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  #58  
Old 05-09-2016, 04:33 AM
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Bob Ellis Bob Ellis is offline
 
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Location: Pembrokeshire, UK
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Default

Just a thought - to save this thread ballooning is it worth only reporting cracks found?
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  #59  
Old 05-09-2016, 06:52 AM
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Auburntsts Auburntsts is offline
 
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Location: Tampa, FL
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Default

Quote:
Originally Posted by s24789 View Post
Completed the inspection using a borescope yesterday afternoon. It was the only way I could see the rivets. No cracks. Took more time to pull the panels than to inspect the rivets.

Phelps RV-7A
Unfortunately, that doesn't help. The RV-7 wing structure is different than the RV-10/14s which is why the SB calls for removing the ailerons for the 10 & 14 in order to conduct the inspection.
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Last edited by Auburntsts : 05-09-2016 at 06:56 AM.
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  #60  
Old 05-09-2016, 07:18 AM
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Low Pass Low Pass is offline
 
Join Date: May 2006
Location: Houston
Posts: 2,012
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Quote:
Originally Posted by amekler View Post
there was an rv7 fatal december 2015 in Hurricane, UT . the report says wing separated
is this the basis for the sb?
alan
I'm sure I'll get a board posting ticket for straying/speculating, but the preliminary report on the Utah event indicates vertical stab likely detached first. Plausible for the wing to overload soon thereafter due to loss of stability. (Point for mentioning - the Utah event is probably not related directly to the aileron attachment cracking issue.)
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Last edited by Low Pass : 05-09-2016 at 08:00 AM.
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