Just interested to know if you can get a 747 to descend from 45,000 to 14,000 in 4 minutes. In the simulators I have used, after the initial 6000 to 8000 fpm as you speed up to just under MMo/VMo, the decent rate sits at about 5000 fpm.
This is with speedbrake fully deployed, gear up, thrus levers closed etc.