In a straight-in approach, the MDH cannot be below which reference?

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Multiple Choice

In a straight-in approach, the MDH cannot be below which reference?

Explanation:
The key idea is that obstacle clearance governs the lowest allowable descent on a straight-in approach. The minimum descent height is the lowest altitude you may descend to on the final approach, but it must not be lower than the obstacle clearance height. The obstacle clearance height is the reference used to ensure there is enough altitude to maintain obstacle clearance along the approach path. If the MDH were below the OCH, there wouldn’t be guaranteed clearance from obstacles, which is not acceptable for a safe straight-in approach. That’s why the MDH cannot be below the obstacle clearance height. The other numbers are just specific values, not the governing reference.

The key idea is that obstacle clearance governs the lowest allowable descent on a straight-in approach. The minimum descent height is the lowest altitude you may descend to on the final approach, but it must not be lower than the obstacle clearance height. The obstacle clearance height is the reference used to ensure there is enough altitude to maintain obstacle clearance along the approach path. If the MDH were below the OCH, there wouldn’t be guaranteed clearance from obstacles, which is not acceptable for a safe straight-in approach. That’s why the MDH cannot be below the obstacle clearance height. The other numbers are just specific values, not the governing reference.

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