Emergency Descent Mode initiates a descent using what maximum descent rate?

• A. Maximum VMO/MMO descent.
• B. Slope controlled descent.
• C. Uncontrolled dive.
• D. Hold at altitude.

Answer: (A)

Emergency Descent Mode is designed to shed altitude as quickly as possible while staying within safe flight envelopes. It achieves this by commanding the aircraft to descend at the maximum safe airspeed—the maximum operating speed (VMO/MMO). At that speed the airplane can achieve the steepest descent rate allowed without exceeding structural or aerodynamic limits, which is crucial in situations like depressurization or urgent terrain clearance. This approach isn’t a fixed slope or glide path, and it isn’t a loss of control; EDM remains controlled to maintain safe handling while descending rapidly. Holding at altitude would defeat the purpose of rapidly reaching a safer altitude.