In the context of aviation and aerospace, an Automated External Defibrillator (AED) is a portable, electronic device used to help restore a normal heart rhythm in individuals experiencing sudden cardiac arrest. It is designed to be used by non-medical personnel, such as flight attendants or pilots, in emergency situations.

AEDs are often installed on commercial aircraft and are used in accordance with Federal Aviation Administration (FAA) regulations. These devices analyze the heart's rhythm and, if necessary, deliver an electric shock to help restore a normal heartbeat. They are an essential component of the medical emergency kit on board many aircraft.

The presence of an AED on an aircraft can significantly improve the chances of survival for a person experiencing cardiac arrest, as immediate treatment is crucial in such situations. Flight attendants and other aviation personnel receive training on how to use AEDs, enabling them to respond quickly and effectively in the event of a medical emergency on board.

In summary, the Automated External Defibrillator plays a vital role in aviation and aerospace by providing a means to respond to cardiac emergencies and potentially saving lives during flights.