

This is why there are so many stories about planes being grounded because someone tossed a coin in, according to superstition, or a nut or something fell into the compressor.
The whole turbine has to be taken apart to get the coin or it might dent something, and the whole engine then does something most exciting when the pilot tries to run it up to service speeds, as a result of the imbalance.
Ah, the technocratic solution. “We’re fine leaving things as-is, because someone will invent a thing to fix it soon”.