So assuming they were at platform of 3-4000' AGL at >11.5d it would take a large ROD to achieve 530'AGL 48seconds after GS* - possibly 2500-3000fpm.
This is similar to the AirInter A320 that hit the mountain on approach to Strasbourg. They were performing a VOR NPA but selected -3300fpm not -3.3°.
It just stresses the importance of checking that the aircraft is descending at a sensible ROD.
As for the comments regarding ILS signal validity (on AvHerald), there is (was) an AIC detailing this. Typically LOC is valid inside 25nm and GP either 10nm or 15nm depending on offset from centreline. Some installations it's more than this due to operational requirements. If you look on a Jepp plate, the vertical profile shows the range the GS signal is valid from - take a look at the ILS for Naples runway 24. You take the LOC from 7000' but the glide is only valid approx 10d - so DON'T arm the approach at BENTO!
A4
You beat me to it Beardy
