vasi

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    PAPI/VASI Obstruction Clearance

    Hey Guys and Gals, I'm a little confused by VASI 4nm obstruction clearance and PAPI 3.4nm obstruction clearance. Is that translated to; You're guaranteed obstacle clearance 4/3.4 miles prior to touchdown or you're guaranteed obstacle clearance until you're 4/3.4 miles prior to the touchdown...
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