When will the PTU activate automatically?

The PTU (Power Transfer Unit) is designed to ensure that the hydraulic systems maintain pressure and fluid movement to critical systems during an engine failure scenario. The activation of the PTU occurs specifically when engine 2 or EDP (Electric Driven Pump) 2 fails. This automatic activation is crucial because, in the event that engine 2 fails, the PTU allows the hydraulic system powered by engine 1 to assist in maintaining hydraulic pressure in the system that would otherwise lose power, thereby ensuring that essential functions such as landing gear operation and control surfaces remain operational.

While other options may mention conditions that are significant for aircraft operations, they do not trigger the automatic activation of the PTU. For instance, during takeoff, the PTU might still be inactive if all systems are functioning normally. Similarly, while it is vital to have the gear up and locked for safe flight, it does not correlate with the PTU's automatic activation triggers. Thus, the condition of engine 2 or EDP 2 failure is specifically engineered to ensure safety and functionality in case of a critical malfunction.