Originally Posted by Spitoon
Given that RADALT only works at low levels - perhaps below the normal safe intercept level
- don't forget rad alt is reading height
AGL, independent of QFE, or QNH etc so if it reads 2000' you are 2000' from the ground (at that moment). Most pilots would be more than happy with 2000' vertical separation from terrain for intercept.
woocash - formating on an unknown aircraft is fraught with danger but is a good last resort. If you have access to a mil pilot you would stand a better chance.