Thanks BOAC and Desert 185 for your replies.
My ( lay) reading of the LAUDA B767 accident report was that the effect was to invert the aircraft resultng in its destruction by excessive G when recovery was attempted. As I recall the pilots were seeking to consult the manaual for guidance. Also as I mentioned originally , I understood that the sim reconsruction indicated a small window of circa 6 seconds for recovery . Have I got this right? - grateful for any further comment from the Pros.
Thanks