Which hydraulic pumps remain operational after a dual IDG failure?

In the context of the Embraer Regional Jet (ERJ) systems, when a dual Integrated Drive Generator (IDG) failure occurs, it's crucial to understand how the hydraulic systems will continue to function. EDP stands for Engine Driven Pump, which is powered by the respective engine, while ACMP refers to the Auxiliary Electric Hydraulic Pump.

In the event of a dual IDG failure, both engines are still operational, so the engine-driven hydraulic pumps remain functional. EDP 1 and EDP 2 are tied to their respective engines and thus will continue to operate provided that the engines themselves are running. This means that both EDPs can supply hydraulic pressure to the system even after losing the electric power provided by the IDGs.

This reasoning leads to the conclusion that both EDP 1 and EDP 2 are capable of providing hydraulic pressure during a dual IDG failure, which aligns with the options provided. On the other hand, while ACMP 3B can operate and provide hydraulic pressure as a backup, it does not fully rely on the engine operation and is secondary to the more primary EDPs in terms of hydraulic system priority and design.

Thus, the correct understanding is that after a dual IDG failure, E