What is FADEC and what are its functions?

FADEC (Full Authority Digital Engine Control) is a computerized system that manages all aspects of engine operation. Functions include: Fuel metering based on throttle position, altitude, and temperature; Surge/stall protection through bleed valves and variable geometry; Starting sequence control; Thrust reverser operation; Health monitoring and fault detection; Interface with aircraft systems; and Redundancy for safety-critical operation. FADEC replaces hydromechanical controls, providing precise fuel scheduling, improved performance, reduced maintenance, and envelope protection. It is certified to DO-178C software standards and typically uses dual-redundant channels.