What test must be performed when relieving a previous crew?

When relieving a previous crew, it is essential to conduct a crew change test. This test is crucial as it ensures that the incoming crew members are familiar with the operations, safety protocols, and any current status or changes that have occurred since the last crew's shift. By performing this test, the new crew can verify their understanding of equipment functions and emergency procedures, thereby maintaining operational safety and efficiency.

The need for a crew change test emphasizes the importance of clear communication between outgoing and incoming crews, as well as ensuring that all team members are up to date with any specific instructions or updates. This practice helps to mitigate risks associated with transitioning between crews, ensuring that all operators are confident and well-informed before taking over the operations.