I’m sitting in ship 3950 looking out over the wing (24L) and noticed patches of a dark grey material on the wing. I’ve counted a dozen such patches on the left wing of varying sizes of a few square inches to over a square foot. I’d never noticed it before, but will keep my eye out in the future. I assume it’s a simple fix for slight bumps on the wing surface—normal wear and tear. Am I right?
A closer look.
An example of the “duct tape” patch.