Simon,
ALL helicopters show signs of a reduction in TR thrust during some low speed flight regime, the effect of some nasty wash or rotor tip vortex hitting the tail rotor. This reduction seems to be about 5% of the available thrust. Call this the "relative wind thrust reduction".
Where does this thrust reduction occur? On Comanche, you could see the yaw control shift and hear the fan sing at a hovering azimuth of 45 degrees (right of the nose). On an S76, the TR pedal shifts about 5% when the wind is from about 60 degrees relative (right). On the plots provided for the B206, it is from about 90 to 135 degrees from the left.
What does this thrust reduction do? On a helo with a TR that is sized to suffer this small loss of thrust and still do its job, nothing. This situation is true of perhaps 95% of the helicopters built. On a helo that has almost NO TR thrust margin to spare, the loss of thrust causes loss of yaw control.
LTE is the resultant of that problem, and is not simulatable unless you first "build" a TR that is very small, and that has little excess thrust, and then also build in a reduction in thrust at a specific azimuth.
LTE has nothing to do with a pilot who pulls too much power, reduces rpm, runs out of yaw control, and then blames LTE.