Final answer:
To be a chief pilot at an air taxi operation, having 500 hours flight time of which 250 hours are as P.I.C in the preceding 3 years on the same category and class of aircraft is not a universal requirement.
Step-by-step explanation:
The qualification that is NOT required in order to be chief pilot at an air taxi operation is:
c) have at least 500 hours flight time of which 250 hours shall be as P.I.C within the preceding 3 years on the same category and class of aircraft being operated.
While requirements for chief pilots typically include having an Airline Transport Pilot License (ATPL), a type rating for the aircraft operated, and knowledge of company and regulatory procedures and standards, there is no universally applied rule about having a specific number of hours in a three-year period on the same category and class of aircraft. However, experience requirements can vary by operator or region. It is important to check the specific requirements set by the relevant aviation authority or operator.