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Post by Flocker on Oct 28, 2019 1:07:44 GMT
Well it looks like I have the same issue now  Yup that's it....sorry. Check around all fuel tank inspection plates and your sumps on the bottom of wings.
I checked the entire wing area. I only have it in the 2 areas posted above. Hopefully it will not get any worse. |
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Post by buzz on Oct 28, 2019 2:31:00 GMT
Yup that's it....sorry. Check around all fuel tank inspection plates and your sumps on the bottom of wings.
I checked the entire wing area. I only have it in the 2 areas posted above. Hopefully it will not get any worse. Good. This week I will be trying to figure out if my inspection panels were actually properly treated prior to painting. Don't see any primer under the bubbled paint. Might be stuck under the layer of paint. |
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Post by Flocker on Oct 28, 2019 13:43:11 GMT
For those of you with the bubbled paint - do you keep your fuel tanks full most of the time? I'm wondering if that would make it worse... I usually keep mine about 1/2 full.
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Post by Tony on Oct 28, 2019 19:20:56 GMT
No. I don’t think it’s fuel related on mine. I have some away from the fuel tank. I thinK it’s just bad prep around the rivets heads.
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Post by buzz on Oct 28, 2019 19:46:53 GMT
No. I don’t think it’s fuel related on mine. I have some away from the fuel tank. I thinK it’s just bad prep around the rivets heads. Tony can you please explain what and where you are seeing the problem that is away from the tanks? Pics maybe. I too am questioning what the cause is. This is why I have been bugging Josh so much about the painting process that tecnam uses. I will however say that Mark and Josh both seem to think it is fuel related. I do not want to do anything until I am sure of the exact cause. I also wonder if we are looking at multiple issues? Also Tony do the bad areas on the wing look the same as by the fuel tank rivets? And please let Josh know about these other areas of concern. All the information amounts to clues to whatever the problem is. Thanks. |
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Post by buzz on Oct 28, 2019 23:24:02 GMT
For those of you with the bubbled paint - do you keep your fuel tanks full most of the time? I'm wondering if that would make it worse... I usually keep mine about 1/2 full. No I am about the same as you. That's what I cant quite figure out. It seems worse where most of the contact is just vapor. Josh wanted to know if my vents where clogged up thus causing pressure build up in the tanks forcing the vapor to find a fault in the sealing job. I checked and both of my vent are good. |
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Post by Tony on Oct 29, 2019 11:49:07 GMT
Buzz,
I’ve been corresponding with Josh about it. I’ll be back in town on Sunday and will document all the locations where it’s happening when I can get to the plane. I’ll let you know then.
Tony
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Post by Flocker on Oct 29, 2019 14:51:22 GMT
I'm curious about Tecnam's painting process as well. The rivets around my fuel tank are all painted over (i.e. no dimple visible). Everywhere else the dimple is visible...
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Post by buzz on Oct 31, 2019 19:09:35 GMT
I took a bunch of more pics of what is going on with my plane. I used the blue stickers to point to the anomalies. As you can see it involves both the rivet areas on the access panels as well as on the wing skin around the panels. It is the same on all four access panels to the tanks on top of the wings and where the fuel sumps are located. I can only do three pics per post so I will do a few more posts to add pics. I forwarded about 30 pics to Josh and he said he was going to forward to Tecnam. |
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Post by buzz on Oct 31, 2019 19:13:34 GMT
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Post by buzz on Oct 31, 2019 19:24:20 GMT
The first pics shows another bubble that I opened up to take a close look at the paint. As you can see there is no paint sticking to the aluminum.The bottom of the paint appears slightly darker and duller than the finish paint. So it looks like there was a white primer on the aluminum prior to the the finish paint. Its just sticking to the bottom of the finish paint. I see no evidence of the green colored paint/primer that you see on other aluminum parts. Open an inspection plate under the wing and look at the parts not painted with final outside paint and you should see that green paint and or the white primer I was talking about. In addition I see no green paint on the inspection plates. You can also view the Tecnam videos online that show the planes during construction and you can see the green paint. Still waiting for a comprehensive explanation of the painting process. The issues on with the rivets appear as soft bubbles. The issues on the wing appear as hard rough areas. My A&P son says the rough areas look like corrosion. But I think it is odd that no where else on the wings is there any of this rough stuff. It is on the skin directly next to the fuel tank inspection plates and sumps. I am having a hard time understanding how I could have corrosion on a plane 4 years old that is well cared for and has always been in a dry hanger unless it wasn't properly prepared prior to painting. |
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Post by Ed Midgley on Oct 31, 2019 20:29:27 GMT
The reason the rivets around the tank are different is because their solid bucked rivets. All the other rivets are pull type rivets. A pull rivet could leak gas if in the tank area.
Ed
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Post by buzz on Nov 22, 2019 4:36:41 GMT
So its been about three weeks since I sent my last set of pics to Tecnam. Haven't heard anything yet. Tony, Flocker do you have any updates on your problems?
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Post by Tony on Nov 22, 2019 9:55:34 GMT
Buzz,
I got a job card approving 10 hours of work and instructions on how to perform the work.
Tony
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Post by Flocker on Nov 22, 2019 14:49:24 GMT
So its been about three weeks since I sent my last set of pics to Tecnam. Haven't heard anything yet. Tony, Flocker do you have any updates on your problems? No update on my end. |
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