: Calculate the Top of Descent (TOD) without modern FMS assistance, often using the "rule of three" (3 miles per 1,000 feet of altitude). Further Exploration Watch a full flight tutorial by a real 737 Captain on to see professional-grade operation of the systems. Learn about the complex Inertial Navigation System (INS) updates in this specialized tutorial part 3 Check out the official aircraft page on the X-Plane.org Store

From that day on, Felis was known as the go-to expert for solving the unsolvable in aviation. Her story served as a reminder that sometimes, it takes an unconventional thinker, someone with the agility of a cat and the determination of a true professional, to crack the toughest challenges.