Loss of Tail Rotor Effectiveness [LTE]

Details+/-
What is LTE?
LTE is an uncommanded, rapid yaw towards the advancing blade which does not subside of its own accord. It can result in the loss of the aircraft if left unchecked.
Which helicopters are susceptible to LTE?
All helicopters with a single main rotor and tail rotor are susceptible to LTE. Those helicopters equipped with a Fenestron are affected by a similar phenomenon traditionally known as 'Fenestron Stall'. The Bell Jetranger is statistically the most likely to encounter LTE and it is this type which caused the FAA to look more closely at the problem back in the 1980s.
Is LTE caused by a mechanical defect?
No. LTE is caused by an aerodynamic interaction between the main rotor and tail rotor. Some helicopter types (Jetranger) are more likely to encounter LTE due to the insufficient thrust produced by having a tail rotor which meets certification standards, but which is not always able to produce the thrust demanded by the pilot.
Videos+/-
A Graph of These Accidents By Model+/-
Count Of Model Fatal Accidents
AS341
2
 
0
B2
1
 
0
B206
3
 
0
Gazelle
2
 
0
R44
2
 
0
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Source Data