Who is responsible for approving all procedures for repairing non-bronze propellers?

The correct answer is NAVSEA, which stands for the Naval Sea Systems Command. NAVSEA is the entity responsible for ensuring that repair procedures for non-bronze propellers adhere to safety and operational standards. They develop guidelines and approval processes for various maintenance procedures to ensure that repairs are done correctly and effectively.

Non-bronze propellers are often made from materials suitable for specific operations or environments, and the complexities involved in their repair require oversight from a centralized authority with expertise in engineering and materials. NAVSEA's role is vital in regulating these procedures to prevent potential failures that could compromise the safety and performance of naval vessels.

The other options—such as the ship's commanding officer, the Chief Engineer, and the type commander—while playing important roles in their respective capacities, do not have the same level of oversight or authority over the development and approval of repair procedures on non-bronze propellers as NAVSEA does. Their responsibilities are usually more focused on day-to-day operations, engineering management, or broader fleet coordination rather than the specific technical standards laid out by NAVSEA.