Flyjet 787
sir,
Thrust asymmetry WILL OCCUR if an engine fails on a twin, whether in flight or on ground.
The effects of asymmetry are opposed by the forces of friction between wheels and ground, but is WAY TOO SMALL to consider.
As far as the critical engine is concerned, it is always the engine, the loss of which will most adversely affect the directional stability of the aircraft. In conventional props it is the left engine.
Vicky