Originally Posted by
kevin18
This may be the most ridiculous thing I’ve seen. You’re trying to tell me that a descent rate down to 10k from 40k is a limiting factor? What do those things last, 15 minutes? Not a memory item so I really don’t care. Regardless, you put that thing down at 320Kias in an idle descent and boards out it’ll be a, at most, 20 second difference between 41k and 39k.
That is the limiting factor on many aircraft. Generally you need to show you can get down to 10,000 feet in 12 minutes. It could also be a performance limit or a limit due to the pressurization system.