What type of calls are permitted during a PIC controlled rest period?

The reason that emergency-related calls are permitted during a Pilot-in-Command (PIC) controlled rest period is due to the critical nature of emergencies in aviation. The safety of the flight and its occupants is always the top priority. In the event of an emergency, it is essential to ensure that the PIC can be alerted immediately, regardless of whether they are in a controlled rest period, to make crucial decisions that could affect the outcome of the situation.

Service-related and informative calls, while important in their contexts, do not require immediate attention and can wait until the PIC resumes active duties. Regular operations and notifications are structured around ensuring that the flight operates smoothly without compromising safety, which is why other types of calls are not permitted during a controlled rest period. Emergency-related calls are an exception to this protocol, as they serve to protect the welfare of everyone on board the aircraft.