Originally Posted by
ICT_SLB
The latest version of Autopilot of the Global Express has an "Emergency Descent" mode triggered off the Cabin Altitude - it turns 90 degrees off the FMS track & does a pre-programmed descent to 9,000 ft (if memory serves). Beleive this is per ICAO norms.
That will work just fine for US crews flying west over the Rockies... once.