Turbulence damping system

[hellkitty]

Hello

I'm looking for some pieces of information concerning turbulence damping system installed in planes such A330/340/B777/787 etc. I've checked the manuals of those planes but there is only few words about that (like what it is for, where's the button, what conditions are required to use it etc) meanwhile I'd like know how does this system work, get some technicall charts, also something about history of this solution as well as it's future.

I'll be very grateful for any help because I need to put it in my student's work.
Regards

[hellkitty]

Hi, it's me again.
I've found that there is also "gusts allevation system" term in use, maybe it helps :)

[FLEXPWR]

Not familiar with these types, but on the old A320's, there was a LAF (don't laugh...) computer, stands for Load Alleviating Function.
Was never really described in detail, but it would make use of ailerons/spoilers in order to reduce stress on the wing structure.

It seems after tens of thousand of hours logged on 320 frames, the wings could cope without them. I have not operated any 320 with such a computer, only read it from old FCOMs.

Flex

[IFixPlanes]

A little bit of nitpicking: ;)
Load Alleviation Function

[Intruder]

AFAIK, the load alleviation and/or flutter damping function is totally automatic, and has no "button" or other pilot control. The computers automatically operate the ailerons and/or spoilers as necessary.

The idea is to control loads at the wingtips to prevent undue stress on them.

[grounded27]

In my crude understanding.. A simple autopilot would respond to the rapid change in altitude on the normal response to maintain it's flight level resulting in an over exaggeration of pitch and roll commands. The new program would dampen the response and as a result more or less based on V/S input make the corrections softer. The crude A/P would be likely to disengage if the pilot had not done so before hand.

[FE Hoppy]

-500 tristars had a similar system which use accelerometers in the body and wing tips to signal one or both outboard ailerons to offload.

can't be bothered dragging the books out but I'm sue a google search would find something.

[TURIN]

Yup, Tristar-500 had ACT, Active Control Technology. I think it was because the -500ft had a longer wing so needed this system to keep the structural weight down. A320 had the LAF, 787 has active spoilers, ailerons & a load alleviation function using the inboard flaps. The inboard and outboard flaps are separated in flight. They move out automatically, depending on load. They also move in the cruise to reduce drag.