In the HLZ setup sequence, which step is performed fourth?

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Multiple Choice

In the HLZ setup sequence, which step is performed fourth?

Explanation:
The step of determining the unusable area using the 10:1 ratio is done fourth because you first set up the core landing area and references, then define the immediate landing points and access controls. With those in place, you quantify the safety boundary around the HLZ by using the 10:1 rule to account for obstacle heights and approach/departure space. That boundary tells you which portions of the surrounding area must be kept clear, and it sets the limits within which you will address obstacles using the 4Rs (remove, relocate, reduce, or mark). In short, you’ve established the landing zone and its control points, then calculate the unusable area to define the safe buffer before tackling remaining obstacles.

The step of determining the unusable area using the 10:1 ratio is done fourth because you first set up the core landing area and references, then define the immediate landing points and access controls. With those in place, you quantify the safety boundary around the HLZ by using the 10:1 rule to account for obstacle heights and approach/departure space. That boundary tells you which portions of the surrounding area must be kept clear, and it sets the limits within which you will address obstacles using the 4Rs (remove, relocate, reduce, or mark). In short, you’ve established the landing zone and its control points, then calculate the unusable area to define the safe buffer before tackling remaining obstacles.

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