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 D.  Each DFCS channel consists of an FCC, an ADI [EADI], and two A/P actuators. A mode select panel controls autopilot/flight director systems and the autothrottle system. An AFC accessory unit (or Integrated Flight System Accessory Unit) and automatic stabilizer trim servo are also installed as well as elevator spoiler, flap position, and stabilizer position sensors.
 E.  Autopilot/flight director disengage warning consists of autopilot warning lights and wailer operation when certain autopilot functions are not correct and/or the autopilot is disengaged. ADI [EADI] pitch and/or roll bars are biased out of view and/or the flight director flag (or computer flag) is biased into view as an indication of certain flight director malfunctions. For additional information, refer to 22-11-00 [22-11-01], Digital Flight Control System.
Yaw Damper System
_________________
 A.  The yaw damper system is a full-time, series-connected, stability augmentation system. Airplane periodic oscillations (dutch roll) are detected with a rate sensor in a yaw damper computer. The rudder is displaced at the proper time to dampen out any dutch roll before it can significantly affect the flight path of the airplane. The yaw damper system and actuators are connected such that no rudder feedback is applied to the pedals, thereby allowing the system to operate independently without interfering with pilot initiated rudder commands. For additional information, refer to 22-12-00, Yaw Damper System.
Autothrottle System
___________________
 A.  The autothrottle system automatically positions all thrust levers to maintain a computed engine thrust level during take-off or go-around, and a selected or FMC computed airspeed (IAS or Mach) during cruise. This system also computes and maintains a safe airspeed during holding patterns and initial approach manuevers. The autothrottle system also retards the thrust levers during automatic landing during flare. The autothrottle system consists of a computer which operates the thrust levers through integrated servo assemblies. For additional information, refer to 22-31-00, Autothrottle System.
Terms and Abbreviations
_______________________
 A.  The following list contains terms and abbreviations commonly used in this
 chapter.
 AAM Autopilot Actuator Monitor
 ACC Accessory
 ACCEL Accelerometer
 ACQ Acquire
 A/D Analog to Digital
 ADC Air Data Computer

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 
737-300/400/500MAINTENANCE MANUAL
 ADI  Attitude Director Indicator
 AFC  Automatic Flight Control
 AFCS  Automatic Flight Control System
 AFDS  Autopilot/Flight Director System
 AIL  Aileron
 ALPHA or AOA  Angle of Attack (Airflow)
 ALT  Altimeter or Altitude
 ANN  Annunciator
 AOC  Approach on Course
 A/P or AP  Autopilot
 ARINC  Aeronautical Radio Incorporated
 A/S  Airspeed
 A/T or AT  Autothrottle
 BARO  Barometric Pressure Set (knob)
 B/B  Back Beam
 BITE  Built-In Test Equipment
 CAA  Civil Airworthiness Administration
 CAS  Computed Airspeed
 C/B or CB  Circuit Breaker
 CDU  Control Display Unit
 CH  Channel
 CLB  Climb
 CMD  Command
 CMPTR  Computer
 C/O  Changeover
 CP  Control Panel
 CPU  Central Processor Unit
 CRS  Course
 CRZ  Cruise
 CWS  Control Wheel Steering
 D/A  Digital to Analog
 DAA  Digital Analog Adapter
 DADC  Digital Air Data Computer
 DEV  Deviation
 DISENG  Disengaged
 DFCS  Digital Flight Control System
 DMA  Direct Memory Access
 DME  Distance Measuring Equipment

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