...why not simply look at cabin ROD and divide it into the cabin altitude? Eg. CA 6000 ft / CROD 500 fpm = 12 min. - if your EET is less than 12 min., you have messed up.
Anyway - with todays typical CI I cannot see it as being a major problem - or are there still some naughty boys out there who like to play fast-jet-jock at 330 KIAS?
