MD-11 automatic flight system

The authors summarize the overall architecture and redundancy management concepts of the MD-11 Automatic Flight System (AFS) and detail the unique application of the flight control computer capabilities to each of the system functions. In addition to the autoland and windshear functions, the integrated AFS provides Longitudinal Stability Augmentation Systems (LSASs) and roll control wheel steering when the autopilot is disengaged; speed envelope protection via autothrottle or the LSAS; yaw damper and turn coordination; elevator load feel and flap limiting control; altitude alert; stall warning with stick shaker and autoslat extend; automatic ground spoilers; wheel spin-up and horizontal stabilizer in motion detection; automatic throttle and engine trim via the Full Authority Digital Engine Control (FADEC); takeoff, cruise, and CAT II approach autopilot and flight director; in-flight maintenance monitoring and ground maintenance functions interfacing with the Central Fault Display System; and annunciation, warning, and alert interfaces with the Electronic Instrument System