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05-08-2016, 07:43 PM
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Join Date: Dec 2010
Location: Vacaville, CA
Posts: 167
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No cracks
Inspected this morning. Used flashlight and borescope. No cracks. RV-9a 800 hours.
__________________
Andy Simpkinson
RV-9a Subaru engine.
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05-08-2016, 08:05 PM
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Join Date: Jan 2012
Location: Oconomowoc, WI
Posts: 460
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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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05-08-2016, 09:10 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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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.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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05-08-2016, 10:51 PM
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Join Date: Jan 2008
Location: Ashland, OR
Posts: 2,573
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inspection completed
RV-8 with 370 hrs. No cracks.
__________________
Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet"
Hobbs 625
LS6-15/18W sailplane SOLD
bought my old LS6-A back!! 
VAF donation Jan 2020
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05-09-2016, 02:42 AM
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Join Date: Aug 2009
Location: Gilford,NH
Posts: 90
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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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05-09-2016, 03:07 AM
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Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,692
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Quote:
Originally Posted by amekler
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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Um....No.........Didn't Scott just explain in detail what the basis of the SB was in the post just prior to yours?
__________________
Bill Pendergrass
ME/AE '82
RV-7A: Flying since April 15, 2012. 850 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
Yeah. The boss got a Silhouette Cameo 4 Xmas 2019.
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05-09-2016, 03:27 AM
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Join Date: Jan 2009
Location: Hobe Sound, Florida
Posts: 292
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Quote:
Originally Posted by Aircraft Specialty
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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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
__________________
Kevin Phelps
Paid thru Dec 2020
RV-7A flying N782WP
Stuart, Fl
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05-09-2016, 04:33 AM
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Join Date: Jul 2007
Location: Pembrokeshire, UK
Posts: 224
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Just a thought - to save this thread ballooning is it worth only reporting cracks found?
__________________
Bob Ellis
www.rv-8.co.uk
G-JBTR Having a ball flying this wonderful machine
Donation July 2016
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05-09-2016, 06:52 AM
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Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,861
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Quote:
Originally Posted by s24789
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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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.
__________________
Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
Last edited by Auburntsts : 05-09-2016 at 06:56 AM.
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05-09-2016, 07:18 AM
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Join Date: May 2006
Location: Houston
Posts: 2,012
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Quote:
Originally Posted by amekler
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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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.)
__________________
Bryan
Houston
Last edited by Low Pass : 05-09-2016 at 08:00 AM.
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