Originally Posted by
Denti
Business jets do have automatic descent for depressurization. But i don't know of any airliner that has that feature. Dunno why, but one reason might be the very different usage rate per year for airliners compared to business jets.
That's probably rather due to the fact that most current Business jets have much higher max ceilings (>/=50kft). At those altitudes TUC is practically non- existant, read zero. Therefore such devices are practically a necessity if you don't want to fly with pressurized oxygen mask in cruise and want to stand any chance in case of decompression.