Thanks Squawk. My question is,if there is no procedure that requires switching off the damper, then how does the pilot know when to switch it off. If no such situation exists, why have it in the first place ?
Yes there is a procedure, and it should be covered in your FCOM. It is when the pilots believe the TURB DAMP function is faulty, yet the aircraft itself doesn't detect the fault. If you don't mind I won't look up the precise quote, but to paraphrase what Airbus say, it's when the pilots believe the TURB DAMP function has developed a fault such that it is ADDING TO the aircraft deviations and not damping them down. In other words if the aircraft were flying in still air, yet was deviating as if it was in turbulence then you might expect the TURB DAMP function may have developed a fault that, for whatever reason, the aircraft didn't detect. You would then turn the TURB DAMP off and see if the flight path deviations reduced to normal (which in calm conditions should obviously be zero).
Hopefully that helps.
PS And no it's not a yaw damper being discussed, nor the function on the A300.