Ceiling?  

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Author: Explanation    Date: 4/16/2025 11:07:06 AM  +7/-0   Show Orig. Msg (this window) Or  In New Window

When you have loose rivets, cracks, or loose airframe joints and continue flying it, the material rubbing against itself frets and creates a black paste of worn off metal material.  It’s called mud and it’s common to see in high cycle high weight operations with old airframes.

 
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Better look at them box beams for cracks +2/-1 Murdockdacoon 4/16/2025 4:01:27 AM