The second and final phase of NASA’s Pilot Breathing Assessment (PBA) program to analyze pilot breathing in high-performance fighter jet aircraft is now complete. Several milestones were added to phase two, which focused on refined methods to gather data from Navy and Air Force oxygen mask regulator systems and in testing cabin pressure in the F-18 A/B. The program began with phase one in early 2018 at NASA’s Armstrong Flight Research Center in California. Phase two started in fall 2019, and the program added an additional 50 flight hours. The research pilots primarily flew F-18 A/B aircraft to eliminate variables between jets, and the group refined data collection procedures, equipment and sensors. Credits: AFRC TV