RR,
There's a difference between LTE (Loss of Tail Rotor Effectiveness - in it's simplist terms, the TR is not 'big' or effective enough to provide control within the entirety of the flight envelope) and LTA (Loss of Tail Rotor Authority - TR doesn't have enough RPM to maintain control due to mechanical problem or the pilot 'overcooking' things).
This has been covered in depth in previous threads.
The B206A was particularly prone to LTE whilst most helis can be subjected to LTA if the pilot allows the RRPM to droop too far.
Or at least this is my understanding of the situation.
HTH,
B73