At what rate should you descend to reach 20,000 feet from 35,000 feet?

To determine the appropriate descent rate to reach 20,000 feet from 35,000 feet, you first need to look at the total altitude change required, which is 15,000 feet (35,000 - 20,000).

Next, to find the descent rate, it’s essential to consider a reasonable time frame for the descent. A common descent profile in aviation might aim for a descent that allows for a comfortable and safe transition into lower altitudes while adhering to typical practices.

If you consider a descent rate of 900 feet per minute, you can calculate the time required to reach 20,000 feet. This descent rate means it will take you approximately 16.67 minutes to descend 15,000 feet, which is within a typical operational range for many aircraft during a cruising descent.

Generally, this descent rate helps maintain passenger comfort and structural integrity of the aircraft while adequately managing air traffic control requirements and ensuring a safe transition through various altitudes. This balance makes a descent rate of 900 feet per minute a practical and acceptable choice for this specific situation.