What should be done to verify the safety when the inner window is cracked?

When faced with a cracked inner window, all the actions mentioned are essential to ensure safety during flight.

First, donning oxygen as necessary is crucial because a crack in the inner window can indicate a possible loss of cabin pressure or can lead to hypoxia if the aircraft is at high altitude. Using supplemental oxygen helps maintain proper levels of oxygen for the pilot and crew.

Keeping the visor down on the helmet serves as an additional precaution. This helps protect the eyes from any debris, glare, or wind that may enter through the cracked window, ensuring that the pilot maintains optimal visibility and comfort.

Turning off the heat switch is also an important step because if the inner window is cracked, the heat is not needed and may exacerbate the situation by causing further cracking or distortion. This could lead to thermal expansion issues or worsen any existing damage.

Therefore, shifting immediate focus to all these measures ensures that the safety of the flight crew and passengers is prioritized while dealing with the compromised integrity of the aircraft's window. By choosing all these actions, one can effectively mitigate risks associated with flying with a cracked inner window.