Jet/turboprop aircraft shall descend at 250 KIAS and ____ feet per minute until platform is reached, at which point the descent shall be shallowed to ____ feet per minute.

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Descent rate at a given airspeed sets the glide path you fly and how you manage energy during the approach. At 250 KIAS, using a higher vertical speed early lets you reach the platform altitude at the correct distance without having to slow too soon, keeping the path efficient and within safe handling limits. A descent rate of about 4000 feet per minute gives a reasonably steep initial glide path so you can close the distance to the platform promptly. Once you reach the platform, reducing the descent rate to about 2000 fpm creates a gentler final approach, producing a stable, shallow glide path that’s easier to manage as you align with the landing runway.

If the initial descent were much shallower, you’d need more distance to arrive at the platform, risking an unstable transition or overspeed close to the platform. If it remained steep after the platform, you could have excessive vertical speed near the runway, making the approach harder to control. The combination of 4000 fpm up to the platform and 2000 fpm thereafter at 250 KIAS provides a balanced, stable energy management and transition into the final approach.