What is required in a descent from 21,000 feet to a lower altitude in terms of rate of descent?

When considering a descent from 21,000 feet to a lower altitude, the required rate of descent is typically calculated based on the guidelines for maintaining a safe and efficient descent profile. A rate of descent at around 2,000 feet per minute aligns well with industry standards for jet aircraft as they descend through higher altitudes. This rate balances the need for a controlled and manageable descent while also meeting Time to descend expectations, especially within controlled airspace where altitude transitions can be frequent.

For most commercial operations, a descent rate of 2,000 feet per minute is sufficient to allow for the necessary altitude changes without causing excessive passenger discomfort or operational strain. It ensures that the aircraft can adjust to air traffic control instructions and airspace restrictions comfortably. Higher rates, like 2,500 feet per minute or more, may be utilized under specific circumstances or aircraft capabilities but are not the standard operational practice for descents in the range discussed.

Thus, selecting a rate of 2,000 feet per minute is considered appropriate for safely managing altitude reductions from 21,000 feet while adhering to recommended practices in aviation.