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I'm puzzled as to how Falcon99 and blind pew have ended up sniping at one another. Who brought the entirely innocent F27 into this?
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Second segment climb criteria is about minimum climb gradient with an engine out ..the WAT curves. Nowt to do with obstacles.
That's PPRUNE for you - you'd never guess what the first "P" is supposed to stand for.
WAT curves apply to both first and second segment (second was usually the more critical when I was calculating 'em) and obstacle clearance calculation involves the use of both first and second segment, particularly at somewhere like Innsbruck (or Mount Hagen IIRC).
Final Take-off Climb could also be relevant in some cases for some aeroplanes.