Final answer:
The PIC must report to ATC detailing the nature of the emergency or reason for the deviation, the actions taken, and any other relevant information as soon as practical after the occurrence, prioritizing the safety of those on board.
Step-by-step explanation:
When there is a deviation from a flight rule or when the pilot in command (PIC) is given traffic priority by Air Traffic Control (ATC) in an emergency situation, the PIC is required to provide a report to ATC regarding the incident. This report should detail the nature of the emergency or the reason for the deviation, the actions taken by the pilot, and any other relevant information that ATC needs to understand the circumstances and ensure the safety of the aircraft and other aircraft in the area. It is important that this report is made as soon as practical after the occurrence; however, attending to the emergency and the safety of those aboard the aircraft always take precedence over immediate compliance with reporting requirements.