With a single IDG failure, which part of the aircraft remains powered?

With a single IDG (Integrated Drive Generator) failure on the A320, a significant part of the aircraft's electrical system remains powered, specifically the entire electrical system except for the main galley bus. This is important for maintaining essential systems and functionalities in the aircraft, ensuring that the crew can continue to operate a safe flight even with one source of electrical power lost.

The A320's electrical system is designed with redundancy and prioritization in mind. When one IDG fails, the remaining systems are still capable of providing power to most of the aircraft's electrical components, allowing operations critical for flight. However, the main galley bus is not powered in this scenario as it is not considered an essential service for the immediate needs of flight safety or operation.

This design helps ensure that critical cockpit instruments, avionics, and essential services remain available, enhancing safety and operational reliability during flight conditions following a single IDG failure.