A330/340 Turb Damp P/B
 

Without quoting the FCOM does anyone have anything to add regarding this?
What does it do exactly?
Anyone ever swtiched it off? With what result?
Many Thanks.

Without quoting the FCOM? Sorry that would be difficult, maybe you meant not quoting the FCOM reference. This is what it does:

TURBULENCE DAMPING FUNCTION

This Topic is relevant to the following aircraft:
The purpose of the turbulence damping function is to damp the structural modes induced by atmosphere turbulence.
The function uses the Nz accelerometer and two dedicated Ny accelerometers. The PRIMs compute a turbulence damping command, which is added to the normal law command for the elevator and the yaw damper.
This function is automatically monitored and becomes inoperative for the remainder of the flight, when a failure is detected. In addition, it may be manually inhibited by switching off the TURB DAMP pushbutton on the overhead panel, when it is considered that comfort is degraded instead of being improved, and no failure is detected.
It is only available if the following conditions are met :
Aircraft in flight
Aircraft speed greater than 200 knots.
Autopilot engaged or normal law active.
Aircraft within the normal flight envelope.

I imagine to really fond out what happens, you would have to fly into turbulence and then switch it off.

Simply put - you should shake more. Its one of those things you dont miss until its gone:)

regards, OORW

On some older aircraft the Autopilot had a Turbulence switch which when engaged reduced the A/p rate by something like 50%.It was just to soften the response in turbulence to stop a strain being put on the structure due to too rapid commands from upsets............

Hey Alright, except the bus does it without the autopilot engaged...:). As long as the ac is in normal law ie: all flying computers working.

No, its not a less responsive autopilot with the bus. This button controls active turbulence damping, where the flight controls are actively deflected by the computers to automatically compensate rough flight.

OORW

good answer
 

Nz accelerometer and two dedicated Ny accelerometers.what is this:confused:

I'd imagine they are simply accelerometers in the Y and Z planes. I'm not an airbus pilot though.

Correct....standard aircraft axis

Like, well, DLC in the 1011