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Features June 2016 Issue

Decision Altitude VS. Minimum Descent Altitude

TERPS specifies precision approach required obstacle clearance (ROC) distance above the obstacle clearance surface (OCS) all the way down the glideslope.

Decision Altitude VS. Minimum Descent Altitude

Decision Altitude and Minimum Descent Altitude are two kids from the same mother with very different personalities. Donít be the relative who mistakenly treats them the same.

Itís easy to munge DA and MDA into the single concept of minimums. Yet, decision altitude (DA) and minimum descent altitude (MDA) are very different concepts. As the names suggest, DA is a decision point while MDA is the lowest altitude allowed without visuals.

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