What is the primary function of the Battery Tie-In Relay?

The primary function of the Battery Tie-In Relay is to allow the battery to charge from the aircraft generators. When the aircraft's engines are running, the generators produce electrical power, which not only powers the aircraft systems but also recharges the battery. The tie-in relay plays a crucial role in connecting the battery to the generator output, ensuring that the battery receives adequate charging during flight and on the ground when the engines are operating.

This function is essential because maintaining the battery's charge is vital for starting the engines and providing power to critical systems, especially during periods when external power sources are not available. The relay enables seamless integration of the battery with the electrical system, facilitating efficient power management across the aircraft's electrical network.