Final answer:
In an emergency on an Airbus A321, emergency exits are used following crew instructions. Locate the exit, ensure it's safe, remove obstacles, and follow the door's opening mechanism.
Step-by-step explanation:
To open the emergency door on an Airbus A321, one must follow specific safety procedures intended for emergencies only. During an emergency, cabin crew will instruct passengers on how to proceed, but here is a general overview.
Locate the emergency door. On the A321, emergency exits are marked and are located at the front, middle, and back of the plane. Assess the situation outside the window if possible to ensure it's safe to open the exit. Remove any obstruction in front of the exit. Follow the instructions, which usually involve lifting a handle or removing a cover and then moving the handle to an open position. Push the door outward or slide it as indicated by the instructions. Remember that these doors should only be opened in real emergencies and under the direction of the flight crew. Improper use can result in severe penalties and endangerment of everyone on board.