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Manual of Standards Part 172—Air Traffic Services
(b) 4,000 FT AGL at distances of 30 NM o(b) 4,000 FT AGL at distances of 30 NM or greater from the DME site.
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(b) 4,000 FT AGL at distances of 30 NM or greater from the DME site.
Note: Where required for a particular lateral separation problem, Local Instructions may specify a lateral separation point based on a precise slant range correction for the levels concerned.