read what Ascend Charlie posted above, #20 I think, LTE was made up by Bell to cover the fact they put an inadequate TR on the 206.
Rotorbee - I was talking about using the term divergence in an aviation context not a literal dictionary one.
LTE is not the explanation of unanticipated yaw, it is unanticipated yaw. Unanticipated yaw exists on any single rotor helicopter, even NOTAR helicopters (see the MD902 Grossglockner accident) and the LTE wording in that case is quite strange. Installing a more capable tail rotor will allow to expand the flight envelope but not cancel the risk of unanticipated yaw. Unanticipated yaw is not a problem of tail rotor sizing.
Bell seems to have been very reluctant to use the LTE wording.