Nope! Comanches do occasionally experience stress relief cracks in the wing skin, but it is not related to the tip tanks. It is related to a problematic bit of detail design by Piper. Piper should have They are actually best left alone as they don't go anywhere once they show. The result because had cut outs in the ribs to allow skin stiffeners to pass through, but didn't put any gussets to continue the stresses along the line of rivets, sometimes they crack. Beyond that, the structure of the Comanche is very strong and does not exhibit fatigue problems even after many thousands of hours of very rough weather flying, such as cloud seeding.