ACAS X replaces TCAS's fixed logic tables with probabilistic algorithms, cutting nuisance advisories by 40–50% while handling drones and eVTOLs alongside manned traffic.
Radio Hangar explores TCAS to ACAS X, the Climb-Climb-Now Voice in the Cockpit, and the Optimized Logic That's Teaching Collision Avoidance to Turn Left Instead of Just Up.
Radio Hangar explores TCAS, the Resolution Advisory, and the Automated Voice That Overrules Air Traffic Control When Two Airplanes Are Thirty Seconds From Hitting.
A pilot's guide to FAR 91.113 right-of-way rules: who yields in converging, head-on, and overtaking encounters, and why the answer is almost always 'turn right.'
FAR 91.113 establishes a right of way hierarchy based on aircraft maneuverability - understand the principle and the entire pecking order becomes logical, not memorized.
ACAS X replaces TCAS II's 1990s-era lookup table with a real-time dynamic programming algorithm designed for drones, eVTOLs, and modern mixed airspace.
The 2002 Überlingen midair collision killed 71 people and permanently established that a TCAS Resolution Advisory legally outranks an air traffic controller.