What is the first step to start the FADPU?

The correct first step to start the FADPU (Flotation and Auxiliary Deployment Pump Unit) involves closing the HPU (Hydraulic Power Unit) valves. This action is crucial because it ensures that the hydraulic system is isolated before you engage the FADPU. By closing the HPU valves, you prevent hydraulic fluid from flowing through the system inadvertently, which could risk damage or create unsafe operating conditions.

This step sets the stage for safely and effectively operating the FADPU, as it allows you to control the flow of hydraulic fluid without interference from the main hydraulic power system. The remaining steps, such as opening the FADPU on each shaft, securing power to HPUs, or turning on the FADPU using the push button, are dependent on having the HPU valves closed first to ensure the integrity and safety of the entire operation.