Supplimentary Web Site for Swissair SR111 Crash:
Flight Control Computers (FCCs) - Operation and Overview:
The AutoFlight System (AFS) receives signals from two air data computers, the inertial reference system, surface position sensors (flaps, slats, ailerons, elevators, horizontal stabilizer) and navigation systems. The AFS uses the input data from these sensors and systems to transmit control signals (through the FCC) to actuators. These signals control the pitch, roll, yaw and thrust of the aircraft during the full flight envelope, through ground rollout. The signals are also sent to the electronic instrumentation system (EIS) to supply the flight crew with flight guidance information. The AFS includes three primary software functions supplied by the FCCs, which are: Autopilot/Flight Director, Flight Augmentation, and the Autothrottle/Engine Thrust Trim System. The signal outputs to the DEU and CAWS for visual and aural alerts are to alert the pilots of any source failures which may affect the accurate presentation of flight data on their displays, and which may affect the availability and dependability of the autoflight system. The FCCs contain 2 channels each called A and B. Each of these channels controls a surface in the roll axis, yaw axis, and the pitch axis. FCC #1 receives power to channel A from DC Bus 1, Channel B from Left Emergency DC Bus, and there is also a back up power feed from the Battery Direct Bus. FCC #2 receives power to channel A from DC Bus 3, Channel B from Right Emergency DC Bus, and there is also a back up power feed from the Battery Direct Bus.Comments/Suggestions:
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