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 2. Abbreviations
_____________
 A.  The following list contains abbreviations commonly used in this chapter. ~....................................................................... |ABBREVIATION | DEFINITION | ......................................................................... | ACARS | ARINC Communications Addressing and Reporting System | ......................................................................... | A/D | Analog to Digital | ......................................................................... | ACMP | Alternating Current Motor-Driven Pump | ......................................................................... | ADC | Air Data Computer | ......................................................................... | ADS | Air Data System | ......................................................................... | ADF | Automatic Direction Finder | ......................................................................... | ADP | Air-Driven Pump | ......................................................................... | AFCS | Automatic Flight Control System | ......................................................................... | AFDS | Autopilot/Flight Director System | .........................................................................

LEFT
MODULE
LEFT
STABILIZER
TRIM CONTROL
MODULE

RIGHT
STABILIZER
TRIM CONTROL
MODULE

Mach/Speed Trim System
Figure 5

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 ~....................................................................... |ABBREVIATION | DEFINITION | ......................................................................... | AIL | Aileron | ......................................................................... | ALT | Altitude or Altimeter | ......................................................................... | AOA or ALPHA| Angle of Attack | ......................................................................... | A/P or AP | Autopilot | ......................................................................... | APP or APPR | Approach | ......................................................................... | APU | Auxiliary Power Unit | ......................................................................... | ARINC | Aeronautical Radio Incorporated | ......................................................................... | ARR | Arrival | ......................................................................... | AST | Automatic Stabilizer Trim | ......................................................................... | A/T | Autothrottle | ......................................................................... | ATC | Air Traffic Control | ......................................................................... | B/A | Bank Angle | ......................................................................... | BAT | Battery | ......................................................................... | BCD | Binary Coded Decimal | ......................................................................... | BIT | Built-In-Test | ......................................................................... | BITE | Built-In-Test-Equipment | ......................................................................... | BNR | Binary Numerical Representation | ......................................................................... | CAA | Civil Aviation Authority | ......................................................................... | CAS | Calibrated Airspeed | ......................................................................... | CDU | Control Display Unit | .........................................................................
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