It’s not “duct tape.” It’s speed tape, and it is authorized for temporary repairs on aircraft before permanent repairs can be made.
Hundred mile an hour tape? Doesn’t a airplane go faster than 100 mph?
Former Army helicopter pilot here. We called it “100 miles per hour tape” for the obvious reason. Stuff was dynamite in stickiness and endurance. Covered bullet holes in the fuselage. Could be used on main rotor blades. Which means enduring speeds much faster than 100 mph.
Observed this many times flying out of CLT. Nothing to see here. Move along please.
Anybody that has ever worked on a “Double Ugly” knows this well. We called it mach 1 tape.