Originally Posted by
gulliBell
As far as I know, approaches are flown on barometric altitude. Presumably there will be a cross check between barometric altitude and radar altitude at some point during the over-water approach phase and any discrepancy noted. The two instruments are usually within close agreement, say 50'.
It was a VFR approach and not an approach with a plate.
I thought the RADALT would be the final instrument as it’s accurate and the altimeter is based on QNH based on a station on land or an area.
So could an error in the RADALT cause this crash if it was over or under reading?