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Old 19th Sep 2008, 10:47
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B777 Cat 2 & 3 Approaches
Why is it that an Alert Height is called on a Cat3 approach and not on a Cat2 approach?

Why does one need a 90m visual segment from the cockpit, yet a RVR of 150m is required for take-off? Surely the 150m requirement overides the requirement of 90m.

Thanks in advance
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