During what phase should aircrew adjust their equipment for safety and comfort?

Adjusting aircrew equipment for safety and comfort is crucial and is ideally done directly following donning their helmet or mask harness assembly. This action ensures that the equipment fits properly and functions as intended right before entering a flight environment. Proper fitting and adjustment at this stage can affect the aircrew's overall performance and safety during the mission.

When the helmet and mask harness are donned, aircrew can assess how the equipment interacts with their body, ensuring that there are no discomforts or obstructions that could hinder their ability to operate effectively. This adjustment phase is essential as it allows for immediate corrections to be made prior to engaging in any critical activities associated with flying.

Other phases mentioned, such as after landing or during emergency procedures training, are not ideal times for making these specific adjustments. After landing, the focus shifts to post-flight procedures, and during emergency procedures training, the emphasis is on practicing response strategies rather than fitting equipment. Before the mission briefing, although important for preparation, equipment adjustments at that point would not involve the immediate practical evaluation that occurs with the helmet and mask already in place.