What are the requirements for CAT III autoland certification?

CAT III autoland enables landing in very low or zero visibility. Requirements include: System redundancy (fail-operational capability, typically triple redundant), Automatic rollout and guidance to taxi, ILS ground equipment to CAT III standards, Aircraft autopilot/flight director meeting accuracy requirements, and Alerting for system degradation. Categories: IIIA (50 ft DH, 200m RVR), IIIB (lower DH, 75m RVR), IIIC (no DH, no RVR limit). Certification per FAR 25.1309/CS 25 requires: Failure analysis (fault trees, FMEA), Simulation testing of fault cases, Flight test demonstration, and Maintenance programs for reliability. Airports must have CAT III lighting and ground equipment. Pilot training and currency requirements apply.