Rare opportunity to demonstrate a sound that no turbine tech wants to hear... ever!
... because it means you have to get that thing you dropped in there back out. Jet engines are heavy and sensitive, so it's a big deal to lift one up and turn it over, just to hopefully drop out a small piece that some dumbass dropped in there.
If that does not work, the engine must be disassembled to the point where the item can be retrieved. This will be an expensive process.
... that's why it's a bad sound.
