Re: BROKEN SPAR
How do I get a copy of the article and pics ?
Jim Patillo <logistics_engineering@...> wrote:
My spar had about 300 hours on it when it failed. When I originally
jigged and put the spars together, I looked them over very carefully
and did not see any sign of stress or cracks. They looked perfect.
After I talked with Scott Swing, the guy who load tested spars for
QAC, I feel confident their testing proceedure was flawed and caused
my problem. I believe there are other bad spars out there in flying
airplanes but will only surface if the spars were aligned like mine.
How long that will take I cannot say.
I believe some spars were over stressed (due to a bad load test
fixture)when tested and are predisposed to failure. I belive there
are stress risers on some spars. Since there were no alignment
markings on the spars indicating top from bottom (after being tested)
one can randomly place the stress riser in the position I did and the
failure will occur.
I will say again, it is very important to monitor the areas just
under pilot and pax legs at the radius. That is the approximate
location where the failure can occur. If you notice the slightest
mark in those areas, ground the airplane and check it out
immediately. My crack appeared so small on the surface that it could
have been easily overlooked. Once I opened it up for investigation I
was glad I did. Read the article I wrote. MAKE SURE TO CHECK LS1
SPARS ON A REGULAR BASIS!
Some may say the failure will only occur on the ground like mine and
James' did but that may not be true.
Jim Patillo N46JP Q200
--- In Q-LIST@..., Mike Perry <dmperry1012@c...> wrote:
I haven't seen any comments on the list since James Postma postedthis
report, but I think we need to discuss it. This is apparently aspar
failure similar to what Jim Patillo found at annual in 2001 (Q-Talkduring
the testing process, leaving a weakened area around BL12 in somespars --
likely only a few spars, but still a concern.for some
airplane.the right side in the area that Jim Patillo has repaired on his
aircraftswerved right, then left, then right and the spar broke. When the
type andsettled to the ground, it ground looped to the right 200 degrees.
owner/builders tohe said that seeing as it is experimental, it is up to the
as theretake some action. There probably will be an NTSB accident report
to thewas substantial damage to the airplane. I was not injured.
also O.K.list as I am not getting mail from the list. Telephone calls are
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