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Discussion in 'Maintenance Bay' started by comancheflyer30, May 16, 2018.
Almost the consistency of sand but softer.
sealant? black tar heroin?
Might be rust but not sure. Reccomend you check the underside of your fill caps and the tank necks for excessive rust. Failing that I would look really hard at the last place I got fuel if near by and check their tanks and filters. Ask them to cut their filter and inspect it if possible. Then pull the tanks and clean them very well.
"Bad news" if it came out of an airplane.
Looks like sand to me, filter failure somewhere along the supply line.
Black tar heroin wins. Best reaponse yet. Hahaha. New fuel caps and yeah the black specs are probably rust from removing old fuel transmitters. They were corroded bad. But the tank was flushed with air/100LL stream since then.
Did it have a jelly-like consistency? Silicone-based sealants can look like that when hit with gas.
No sealant in this tank. Im thinking varnish breaking up
Got any cork seals on the tank that might be degrading?
The fuel transmitters were cork i believe. They were replaced recently. Hmmm
I think the technical term for that is “crap”.
Do the bladders have foam baffles in them that could be breaking down?
I shall name it "Money".
Cork soaked improperly can exhibit a deteriorating condition.
I think "anti-money" would be more appropriate.
Maybe see which solutions dissolve it or if it can't be dissolved at all.
OK, here is what you need to. If it appears to be organic, not mineral, pyrolyse it onto a KBr disc and run it on a FTIR spectrophotometer with a spectrum library. Careful comparison of the candidate spectrums will hopefully yield a match. If it appears to be mineral, then it is sand, SiO2. Write a report and submit it for review and signature.
Mystery solved. Easy-peasy.
Next time I sump my tanks I will take my FTIR spectrophotometer with spectrum library to the hangar with me.
But can you remind me how to pyrolyse it onto a KBr disk?
Sorry, I know that was of no help. But if you really are interested, send it to a materials testing lab, and as for such a test. Guessing $100
I know. I was just kidding. We can guess all day, but in order to know, a real qualitative analysis is required.
That would depend on what side of the fence you're standing on.
Im trying to dissolve what was found in the tank. Bottom has spots of varnish and gum from old mogas. I will be taking the top panel off and removing the tank if it doesnt work