Onceapilot, capture from below
should be the procedure, because it's safe.
However, in practice, ATC asks you to capture from above
once in a while... a capture from above is also part of a CDA. (And people sleeping under an approach path appreciate any reduction of jet noise.)
But the automation can do very nasty things to you (fly the plane into stall
) if you fail to capture the glidescope from above. Good to be warned about that!
