Originally Posted by
pilotmike
Apparently the aircraft reached 1,775' and then descended at a rate of 3,200 fpm, for about 30seconds.
My maths says that would be uncomfortably low. As the airport is only at about 100' elevation, that really would be too close for comfort.
Looking at the plot, I can't see where the 30 seconds descent duration comes from.
There is a series of plots that appear to show the climb interrupted by a descent from 2075' to 1600' (both uncorrected for QNH) over 15 seconds, before a positive ROC was re-established.
Within that, there are two consecutive points, 3 seconds apart, showing a drop in height of 150', which is presumably where the calculated 3000 fpm comes from, until one remembers that the height readouts are all ± 25' and the timestamps ± ½ sec.
Certainly something happened, but I'd be surprised if brown trousers resulted on this occasion.