What must be done after switching HPUs to ensure proper function?

Testing for positive rudder control after switching hydraulic power units (HPUs) is essential because it ensures that the rudder mechanism is functioning correctly and is responsive to input. This test is critical as it verifies that the hydraulic system is delivering the necessary pressure and fluid flow to the rudder controls, which is vital for safe maneuverability of the vessel. Without confirming that the rudder can operate effectively, the risk of navigational issues increases significantly.

Running diagnostics immediately, while important for overall system health, does not specifically confirm the operational status of the rudder after switching HPUs. Notifying all crew members is essential for communication and safety protocols but does not directly impact the functionality of the rudder. Waiting for automatic adjustments may be relevant in some contexts, but it does not guarantee immediate verification of the rudder's operational status, which is critical for safe vessel navigation after making such a change to the hydraulic system. Thus, ensuring positive rudder control directly addresses the operational readiness and safety implications following the HPU switch.