What must the flight crew confirm regarding the altitude selector prior to takeoff?

The flight crew must confirm that the altitude selector is set to the assigned altitude or, if applicable, an intermediate level-off altitude prior to takeoff. This is crucial for ensuring that the aircraft adheres to the designated flight path and maintains safety during the departure phase.

Setting the altitude selector correctly allows the aircraft's autopilot and flight management systems to function as intended, providing clear guidance on the expected altitude to maintain during the climb. This step is essential not only for adherence to air traffic control instructions but also for ensuring the crew has a clear understanding of their initial climb profile, promoting safety and operational efficiency.

By confirming this setting before takeoff, the flight crew can avoid potential miscommunications with air traffic control, which could lead to altitude conflicts and jeopardize safety during the critical phases of flight. Hence, setting the altitude selector to the assigned altitude is a fundamental step in a structured approach to flight preparation.