What should a flashing green light indicate regarding external power?

The flashing green light indicating external power availability before engine start plays a critical role in the operational readiness of the aircraft. This light signifies that the external power source is connected and functioning correctly, enabling the aircraft systems to operate without relying on the onboard battery power. When the green light flashes, it assures the crew that they can safely use external power to prepare the aircraft, perform pre-flight checks, and power up systems that require electricity prior to starting the engines.

Understanding the significance of the external power indication is essential for ensuring the safe operation of the aircraft. If external power were unavailable, certain pre-flight preparations and system checks could not be conducted efficiently, and reliance would shift entirely to the aircraft’s batteries, potentially leading to operational constraints. Hence, recognizing the meaning of the flashing green light is crucial for effective pre-flight management.