What is the minimum battery voltage required to apply external power?

The minimum battery voltage required to apply external power to the Super Hornet is 18.5 volts DC. This voltage level is critical for ensuring that the aircraft's electrical systems function properly when external power is applied. Operating below this threshold may lead to insufficient power to start up avionics and other essential systems, potentially leading to operational issues or failure to start the aircraft altogether.

In terms of aircraft maintenance and safety protocols, the requirement for a minimum of 18.5 vdc ensures that batteries are sufficiently charged to handle the load imposed by external power connections, which includes powering various onboard systems safely and effectively. This is crucial in maintaining the operational readiness and reliability of the aircraft during inspections or when preparing for flight.