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Define a Visual Descent Point (VDP) and state if its use is ever a mandatory requirement?

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Final answer:

A Visual Descent Point (VDP) is a predetermined point on the approach to a runway where pilots can safely begin their descent from the MDA, provided they have the necessary visual reference.

Step-by-step explanation:

A Visual Descent Point (VDP) is a defined point on the final approach of a nonprecision instrument approach (usually straight-in) where a normal descent from the minimum descent altitude (MDA) to the runway touchdown point can begin, provided adequate visual reference with the runway environment is established and maintained. It is calculated to provide an optimal descent angle without undershooting or overshooting the runway. Use of the VDP is not mandatory; however, it is a helpful cue to pilots to ensure a safe and stabilized approach. Should a pilot reach the MDA before the VDP and not have the necessary visual references, they must continue at MDA until the VDP is reached. If the runway environment is not in sight upon reaching the VDP, the pilot should execute a missed approach.

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