It’s used for very minor repairs, in this case, a more permanent repair is under the tape, but is likely curing, so they slap some speed tape on it.

Speed tape never holds anything down, it’s just used to smooth over a surface, to allow better air flow.

Whatever is being covered by the speed tape will likely see more attention from maintenance later.

https://www.salon.com/2011/10/27/ryanair_duct_tape_controversy/