Geen idee of dit klopt maar op Airliners.net vond ik deze tekst:
In an A320 though, you will descend at about 1300 fpm with no engines at higher altitudes, and around 800 to 1000 fpm around 10,000 feet. So, starting at around 35,000 feet you have roughly 30 minutes before you land. The cabin altitude, if pretty tight, will be rising at about 500 fpm with no engines.
Therefore, with a cabin altitude of 7,000 feet at 35,000 feet, you have about 14 minutes before the masks come down at a cabin altitude of 14,000. That would happen at an altitude of around 17,000 to 18,000 feet, so your passengers would not require the oxygen masks all that long.
As far as distance, you can safely count on around 90 miles to glide from 35,000 feet.
Dat zou betekenen dat de rate of descent bij een two engines flame out veel langzamer is dan wat er vanochtend was.