Loss of tail-rotor effectiveness

Okay, so imagine you have a toy helicopter. You know how it has a big main rotor on the top and a smaller one on the back that spins to make the helicopter turn left or right? That back rotor is called the tail-rotor. Now, sometimes when a real helicopter is flying, something called "loss of tail-rotor effectiveness" can happen.

Here's what that means: when the pilot wants the helicopter to turn left or right, they use the tail-rotor to push the back of the helicopter in the opposite direction. But if something goes wrong and the tail-rotor isn't working as well as it should be, the helicopter might start to spin around really fast instead of turning nicely. That's like the toy helicopter spinning around in circles instead of turning left or right like it's supposed to.

This is a really big problem for the pilot because if the helicopter is spinning too much, they might not be able to control it anymore and it could crash. So, if they notice that the tail-rotor isn't working well, they have to be really careful and do things like fly the helicopter slower and pay extra attention to what they're doing to keep it safe.