Final answer:
In aviation, the PIC is the person responsible for the safe operation of an aircraft. When a pilot does not hold an appropriate rating, they cannot act as the PIC in solo operations.
Step-by-step explanation:
In aviation, the Pilot in Command (PIC) is the person responsible for the safe operation of an aircraft. In solo operations, when a pilot does not hold an appropriate category/class rating, they are not qualified to act as the PIC. The PIC must have the necessary qualifications and certifications to legally operate the aircraft.
For example, if a pilot only holds a rating for single-engine airplanes, they would not be qualified to act as the PIC of a multi-engine aircraft unless they have the appropriate multi-engine rating.
It is important for pilots to always adhere to the ratings and qualifications required by aviation regulatory authorities to ensure safe and legal operations.