Premature slat retraction
IF this is what happened it is indeed very similar to the PI accident. All the more sad therefore that those old lessons weren't learned. Within a few weeks of that crash we all we went back to the sim for the irreverently titled 'Sam Key Memorial Exercise'. The 'droop' (leading edge flap, no slot) was raised about 40 knots too soon, all hell broke loose, and order was immediately restored by reselecting the droop down. All a bit of a non event... once one knew what to do. The general rule of 'if something horrid happens, undo the last action' works even if you don't understand exactly what's going on and ought to be more generally known.