Name that sediment

Discussion in 'Maintenance Bay' started by comancheflyer30, May 16, 2018.

  1. comancheflyer30

    comancheflyer30 Pre-Flight

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    Almost the consistency of sand but softer.

    [​IMG]

    [​IMG]
     
  2. eman1200

    eman1200 Touchdown! Greaser! PoA Supporter

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    sealant? black tar heroin?
     
  3. ktup-flyer

    ktup-flyer En-Route

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    Cheeto dust
     
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  4. Vaflier

    Vaflier Pre-takeoff checklist

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    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.
     
  5. PaulS

    PaulS Final Approach

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    "Bad news" if it came out of an airplane.
     
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  6. PaulS

    PaulS Final Approach

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    Looks like sand to me, filter failure somewhere along the supply line.
     
  7. comancheflyer30

    comancheflyer30 Pre-Flight

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    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.
     
  8. FastEddieB

    FastEddieB Final Approach

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    Did it have a jelly-like consistency? Silicone-based sealants can look like that when hit with gas.
     
  9. comancheflyer30

    comancheflyer30 Pre-Flight

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    No sealant in this tank. Im thinking varnish breaking up
     
  10. Jeff Oslick

    Jeff Oslick En-Route

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    Got any cork seals on the tank that might be degrading?
     
  11. comancheflyer30

    comancheflyer30 Pre-Flight

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    The fuel transmitters were cork i believe. They were replaced recently. Hmmm
     
  12. DaleB

    DaleB En-Route

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    I think the technical term for that is “crap”.
     
  13. ktup-flyer

    ktup-flyer En-Route

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    Do the bladders have foam baffles in them that could be breaking down?
     
  14. Bill Jennings

    Bill Jennings Touchdown! Greaser! PoA Supporter

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    I shall name it "Money".
     
  15. Ben Diss

    Ben Diss Pre-takeoff checklist

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    Cork soaked improperly can exhibit a deteriorating condition.
     
  16. JOhnH

    JOhnH Touchdown! Greaser! PoA Supporter

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    I think "anti-money" would be more appropriate.
     
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  17. Clark1961

    Clark1961 Touchdown! Greaser!

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    Maybe see which solutions dissolve it or if it can't be dissolved at all.
     
  18. Morgan3820

    Morgan3820 Pattern Altitude

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    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.
     
  19. JOhnH

    JOhnH Touchdown! Greaser! PoA Supporter

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    Yeah, easy.
    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?
     
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  20. Morgan3820

    Morgan3820 Pattern Altitude

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    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
     
  21. JOhnH

    JOhnH Touchdown! Greaser! PoA Supporter

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    I know. I was just kidding. We can guess all day, but in order to know, a real qualitative analysis is required.
     
  22. bluerooster

    bluerooster Pattern Altitude

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    That would depend on what side of the fence you're standing on.
     
  23. comancheflyer30

    comancheflyer30 Pre-Flight

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    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