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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
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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
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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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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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