What is the maximum RPM allowed with one shaft locked?

The correct answer reflects the operational protocols for the Fast Response Cutter regarding maximum RPM when one shaft is locked. In such a situation, it is critical to ensure that the vessel maintains safe operational parameters to prevent damage to the propulsion system or compromise navigation safety.

The established limit of 1325 RPM is designed to keep the vessel within a safe threshold while dealing with potential stability issues caused by one shaft being non-functional. This RPM limit ensures the engines can operate efficiently without risking any undue stress or strain on the remaining functional systems. Following this guideline allows the crew to manage speed and maneuverability effectively while maintaining compliance with safety standards.

In this context, while other RPM figures might seem viable at a glance, they exceed the limits set for safe operations in the specific scenario of one shaft being locked, which can lead to mechanical problems or jeopardize the vessel's control and stability. Understanding these limits is crucial for maritime operations and contributes to overall safety at sea.