Upon receiving a clearance to descend to FL 210 and turn to 210°, what should you do?

The correct answer is focused on the importance of communication and confirmation in aviation operations. When you receive a clearance to descend and a specific heading, it is essential to read back the clearance with both the altitude and the direction given. This practice confirms that you have understood the instructions correctly and allows the air traffic controller to verify that there are no misunderstandings.

Reading back clearances is a critical safety procedure designed to eliminate errors and ensure that both pilot and controller are on the same page regarding the flight's planned maneuvers. It serves as a check to ensure that you are aware of the specific instructions you need to follow, which is crucial during flight operations, particularly when changes in altitude and direction are involved. This helps maintain safe separation from other aircraft and ensures compliance with air traffic control instructions.