This is a zoom of the critical event.
At time 2512 V/S starts reducing from peak value of 4,000 fpm.
In the 12 secs before it had increased very significantly from 2,000 fpm to 4,000 fpm, aircraft climbed from 2,900 to 3,600.
In the same period GS had increased from 166 to 180 KT.
The event happens suddenly after a significant increase in ROC and GS.
