Kflexer said . . .
"LTE is simply a term used to describe the condition of flight that occurs when one applies more torque to the main rotor than the tail rotor is capable of counteracting."
I would add LTE is a term created by Bell, to justify and blame the effects of underpowered tail rotors on some of their helicopters, and make it seem like the tail rotor is affected by mysterious phenomena that makes it be magically uneffective under certain conditions.