Final answer:
Upon completing a flight test for an Airline Transport Pilot Certificate in a B-727, a commercial pilot with DC-3 and DC-9 type ratings may exercise the privileges of an ATP Certificate but is required to have a type rating for the B-727 to act as PIC on that specific aircraft.
Step-by-step explanation:
Airline Transport Pilot Certificate and Type Ratings
When a commercial pilot holds DC-3 and DC-9 type ratings and completes a flight test in a B-727 for an Airline Transport Pilot Certificate, they are entitled to certain privileges based on the successful completion of the test and the ratings they hold. Completing the test successfully demonstrates the pilot's competence in flying a complex and larger aircraft like the B-727, which generally requires a higher skill level than what is required for the DC-3 and DC-9 aircraft.
Upon passing the flight test, the pilot may exercise the privileges of an Airline Transport Pilot (ATP) Certificate, which is the highest level of aircraft pilot certificate. Those privileges typically include acting as captain or pilot-in-command (PIC) on scheduled air carriers. However, to exercise the privileges for a specific type of aircraft, such as the B-727, the pilot must also hold a type rating for that particular aircraft. In this case, if the pilot does not already have a B-727 type rating, they would not be able to act as PIC on a B-727 despite passing a flight test in it, unless they subsequently obtain this type rating.
The type rating demonstrates that the pilot has received training specific to the aircraft's systems, handling, and operational procedures. It is critical for ensuring the safety of the pilot, passengers, and aircraft. Therefore, if the pilot wishes to exercise ATP privileges in the B-727, they must acquire the B-727 type rating in addition to having passed the ATP flight test in that aircraft.