In the Gulfstream G550/450 and G650 models there is an "EDM" or Emergency Descent Mode on the Autopilot.
Quite simply if the aircraft is above FL400 (normal cruise altitudes are FL410 to FL510 for these models) with the autopilot engaged and a "Cabin pressure low" CAS msg is generated, the aircraft turns 90 degrees to the left, automatically engages the auto throttles if not already engaged, and commences a FLCH descent to 15,000ft at Mmo/Vmo, levels off at 15,000 feet and sets speed to 250 knots indicated.
Thinking it would be beneficial if a system similar to this was more widely used on other automated aircraft.
Last edited by Astra driver; 6th Sep 2014 at 20:15.