In some cases, the automation even extends to emergency and abnormal situations. For example, the fadec that controls the GE Honda HF120 engines prevents them from starting if the systems are indicating something abnormal, such as a hot start. The emergency descent mode (EDM) is an incredible feature we tried out in the full-motion simulator. At 43,000 feet with the autopilot on (EDM engages above 25,000 feet), cabin pressure was increased beyond 10,000 feet, triggering a bunch of lights, bells and whistles. Before I had time to don the oxygen mask, the autopilot had entered a left turn and started a descent at red line. All I had to do was bring the thrust levers to idle and watch the altitude wind down to 15,000 feet like a high-speed elevator.