What information is needed when notifying crew management about a change in off duty time?

When notifying crew management about a change in off-duty time, providing the new off-duty time is essential for several reasons. The new off-duty time allows crew management to accurately update scheduling and operational records, ensuring that all personnel are informed of the changes affecting their availability. This information is critical for maintaining the overall efficiency of train operations and for compliance with labor regulations regarding rest periods. Accurate documentation of the new off-duty time is vital for planning subsequent assignments and ensuring safety standards are met, as crew members need adequate rest before their next duties. Thus, specifying the new off-duty time directly supports operational continuity and effective crew management.