What must be done after squeezing the lock release to close the flight deck window?

The procedure for closing the flight deck window after squeezing the lock release involves rotating the handle outward. This action is crucial because it effectively engages the locking mechanism that secures the window in place, ensuring that it is tightly sealed during flight.

Proper closure of the flight deck window is essential for maintaining cabin pressure and safety, preventing any issues related to airflow or noise during operations. By rotating the handle outward, the crew can confirm that the window is secure, which is a critical part of the pre-flight safety checks.

In contrast, the other options do not achieve the required secure closure of the window. For example, sliding the metal hook backward would not contribute to closing the window but instead serves a different function related to the window’s locking mechanism. Additionally, pushing the window outward or rotating the handle inward is not the correct procedure for ensuring the window is properly closed. Such steps would not engage the locking mechanism as required.