EASA Module 11 Practice Exam

The key idea is how the accumulator stores energy to keep hydraulic pressure when the pump isn’t running. When the engine-driven pump is supplying pressure, the system is normal because the pump is active. Once the engine is shut down, the pump stops, and any remaining pressure should come from the accumulator, which is precharged with gas to exert pressure on the fluid. If there’s no pressure after shutdown, it means the accumulator cannot provide that reserve—usually because there is no air (gas) pressure in the accumulator. Without that precharge, the stored energy is gone and the system pressure collapses as soon as the pump stops. An incorrectly set pressure regulator would affect pressure while the pump is running, not explain a sudden loss after shutdown. Air in the hydraulic system would cause symptoms during operation as well, not specifically the immediate drop after shutdown. A leak would generally show a pressure drop during operation as well, not only after shutdown.