Direct lift control

[SP]

Hi chaps, just brushing up on some interviews questions here. I cannot seem to find in the aviation books I have, anything relating to direct lift control. It sounds like a moving control surface to me but I would really like to have a specific answer. I would also like to know what "active controls" are.
Thanks for your help.
SP

[spanners]

DLC is the ability to translate the a/c in the vertical plane without adjusting the aircraft attitude. The L1011 had DLC by use of spoilers which operated in a certain range. (Also the F16 Fighting Falcon-but thats FBW).

Active controls, again the L1011-500 had these in Gusta alleviation systems. Basically the ailerons would move to allleviate gust loads without any pilot input. (All done by magic boxes. PFM!!)
Regards

[411A]

Ah yes......PFM, and if NOT interfered with by the flight crew (who "sometimes" do NOT understand the system) works QUITE well on the L1011-500.

[Pengineer]

My mate Mal is a bit of a Tripestar junky so he'll know all about it, be prepared though!
I'm sending him this page....



[ 05 August 2001: Message edited by: Pengineer ]

[Max Angle]

As said above Tristar has it, works well so a mate says who drove one many moons ago. The only current large a/c I know of that uses it is the Boeing (nee. Douglas) C17, a truly amazing bit of kit.

[SP]

Thanks for the answers. I knew PFM had something to do with it.....
SP

[CaptSensible]

The A320 series has a system called LAF (Load Alleviation Function). The ailerons will (automatically) move in a co-ordinated fashion to reduce spanwide loads.