What activates the standby electric motor-driven pump in the standby hydraulic system?

• A. Manual operation of the FLT CONTROL switch
• B. Automatic operation of the system
• C. Engine-driven pump activation
• D. Low pressure alarm activation

Answer: (B)

The standby electric motor-driven pump in a hydraulic system is activated during automatic operation of the system. This design ensures that in the event of a failure in the primary hydraulic system, such as a drop in pressure or a malfunction of the engine-driven pump, the standby electric pump will automatically engage to maintain hydraulic function and system pressure.

Automatic activation provides a fail-safe mechanism, ensuring that hydraulic power is continuously available when needed, particularly in critical situations where system reliability is paramount. The transition to the standby pump occurs without the need for manual intervention, allowing for swift response to hydraulic demands.

Manual operation, while it is a possible method to engage the pump, is not the primary activation mode for standby operations, which are designed to respond autonomously. Similarly, activation through the engine-driven pump or through low pressure alarm systems does not describe the primary rationale for engaging the standby electric pump; instead, these might serve as indicators of when the standby should come online rather than direct triggers for activation.