This paper tries to find the answers to the following questions: What does Situational Airworthiness (SA) truly mean from the viewpoint of the pilot ability to keep acceptable safety level on each phase of the aircraft mission execution? Which element of the aviation model has the highest influence on that pilot ability? Which sub-factors have the highest influence on the probability of achieving and maintaining an acceptable level of sub-areas of SA by the pilot during the preparation and execution of air missions? Moreover, the paper discusses sub-subjects as the definition of SA, relations between processes and the status of SA. The conclusions of the paper are partially based on the Authors’ research of the years 2012-2013.