Hey Machtuck, I note you say the stupidly high rates of descent quoted by Green Goblin were just that - STUPID. But you also said, for comfort, normal ops 500 fpm, anything else is too much. Serious?? Jets coming down from altitude on a normal profile at descent speeds are doing around 2200 =, 2300 fpm. 500??? Dude you need a new pressurisation system.