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#1
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Inspection was done on our Blahnik this afternoon....
Our Blahnik has a low number of flight...ie. only 1200 hours with 1750 starts. No acrobatics flight except a few rare loopings... Always aerotowed...No winch launches... Inspection with eyes and bright light showed nothing. We took pictures wtih a small digital cam equipped with a flash (small Olympus one). When we uploaded the pictures on the PC, we carefully looked at the pictures and we saw ...longs thin cracks... With the eyes it was impossible to detect due to the fact that the available room for inspection is very limited.... We spoke in the previous post about fatigue....well, I am deeply convinced that our Blahnik has never been "fatigued".... The cracks seems to be produced because the rivet from which the cracks are born, has been installed by a hand process during the manufacturing. The manual process for installing these rivets is clear on the picture I took. I strongly suspect a poorly manual manufacturing process instead of a fatigue problem. I am really upset to discover this problem now especially that there is no repair procedure nor a replacement procedure. The AD just states that the Blanik is grounded. This is unacceptable |
#2
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On Jun 25, 8:41*am, nimbus wrote:
When we uploaded the pictures on the PC, we carefully looked at the pictures and we saw ...longs thin cracks... I would be really skeptical about things that show up in a digital photo that don't appear under direct observation. It could be that what looks like cracks are artifacts of the digital photography or JPEG compression. I would recommend you get a second opinion before taking any action. Also, it could be that what looks like cracks are actually just normal striations from the extrusion process by which the spar caps are formed. They could also be local disruptions in the surface anodizing, if the parts are anodized. We've seen that around rivets on the anodized spars of RV-series homebuilt airplanes, and it has not been a structural concern. Thanks, Bob K. |
#3
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On Jun 25, 11:41*am, nimbus wrote:
Inspection was done on our Blahnik this afternoon.... Our Blahnik has a low number of flight...ie. only 1200 hours with 1750 starts. No acrobatics flight except a few rare loopings... Always aerotowed...No winch launches... Inspection with eyes and bright light showed nothing. We took pictures wtih a small digital cam equipped with a flash (small Olympus one). When we uploaded the pictures on the PC, we carefully looked at the pictures and we saw ...longs thin cracks... With the eyes it was impossible to detect due to the fact that the available room for inspection is very limited.... We spoke in the previous post about fatigue....well, I am deeply convinced that our Blahnik has never been "fatigued".... The cracks seems to be produced because the rivet from which the cracks are born, has been installed by a hand process during the manufacturing. The manual process for installing these rivets is clear on the picture I took. I strongly suspect a poorly manual manufacturing process instead of a fatigue problem. I am really upset to discover this problem now especially that there is no repair procedure nor a replacement procedure. The AD just states that the Blanik is grounded. This is unacceptable Would you consider posting those pics somewhere? - Evan Ludeman / T8 |
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