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I see what you are saying, the "lever or handle" is the angle of attack sensor, but I have no idea what has caused the rings to form almost centered on it. If I had to guess I think it may be caused by jet blast from starting anouther A-10 with the engines pointed at this example. But that is just a stab in the dark. The rings look like they are about the same height as the A-10 engine exhaust, or slightly lower.A technical question about the A-10 please. On the shots showing closeups of the left side of the cockpit, on the fuselage side slightly to the rear is a lever/handle, which around it are circular marks, of increasing diameter. These marks, left on the paint, indicate some kind of frequent maintenance. What kind? Weathering on an A-10 model may be needed.
Of course, maintenance for the models in the last photo will be prohibitive.
The question you asked intrigued me a bit and so I did some photographic research. It would seem that many A-10s have these strange rims in the fuselage.A technical question about the A-10 please. On the shots showing closeups of the left side of the cockpit, on the fuselage side slightly to the rear is a lever/handle, which around it are circular marks, of increasing diameter. These marks, left on the paint, indicate some kind of frequent maintenance. What kind? Weathering on an A-10 model may be needed.
Of course, maintenance for the models in the last photo will be prohibitive.