| ACC  (.1.).Active.Clearance.Control.
 (.2.).Area.Control.Center
 Acclrm  Accelerometer
 ACCTS  Aviation.Coordinating.Committee.for.
 Telecommunications.Services
 ACE  (.1.).The.control.character.meaning.technical. acknowledge. (.2.).Actuator.Control.Electronics.
 ( 3 ) Advanced Certification Equipment
 ACF  (.1.).Area.Control.Facility.. (.2.).ACARS.Convergence.Function.(ARINC.622)
 ACID  Aircraft Identification
 ACIPS  Airfoil.and.Cowl.Ice.Protection.System
 ACK  The.control.character.meaning.technical.
 acknowledgement.of.an.uplink,.used.in.an. ACARS.System
 ACKNLGE  Acknowledge
 ACMP  Alternating.Current.Motor.Pump
 ACMS  Aircraft.Condition.Monitoring.System
 ACO  Aircraft Certification Office
 ACP  Audio.Control.Panel
 ACRP  Aircraft Certification Regulatory Program
 ACS  (.1.).Active.Control.System. (.2.).Audio.Control.System
 ACSG  Aeronautical.Communications.Sub-Group
 ACT  Active ACU  (.1.).Apron.Control.Unit.. (.2.).Antenna.Control.Unit..
 (.3.).Autopilot.Control.Unit
 A/D  Analog-To-Digital
 AD  Administrative.Domain
 ADA  Computer.Programming.Language
 ADAS  Automated Weather Observing System Data
 Acquisition System
 ADATE  Advanced.Design.Adaptive.Test.Executive
 ADC  (.1.).Air.Data.Computer:.A.computer.that.receives. inputs.from.temperature.sensors.as.well.as. static.and.pitot.ports..Then.it.generates.altitude,. airspeed,.vertical.speed.and.several.computed. temperatures..
 (.2.).Analog-to-Digital.Converter
 ADF  Automatic.Direction.Finder:.Receiver.that. provides bearings to radio frequency transmitters in a compatible frequency range.
 ADI  Attitude.Director.Indicator:.A.PFD.display.that. provides.pitch.and.roll.information.
 ADIRS  Air.Data.Inertial.Reference.System
 ADIRU  Air.Data.Inertial.Reference.Unit
 ADL  (.1.).Aeronautical.Data.Link.. (.2.).Airborne.Data.Loader.(ARINC.615)
 ADLP  (.1.).Airborne.Data.Link.Protocol.
 ( 2 ) Aircraft Data Link Processor (MODE-S)
 ADLS Aeronautical.Data.Link.Services ADM Air.Data.Module ADMS Airline.Data.Management.System ADNS ARINC.Data.Network.Service ADP Air.Data.Processor ADPCM Adaptive.Pulse.Code.Modulation ADRAS Airplane.Data.Recovery.and.Analysis.System
 ADS  (.1.).Air.Data.System.. (.2.).Automatic.Dependent.Surveillance:. A surveillance technique in which aircraft
 automatically.provide,.via.data.link,.data.derived.
 from on-board navigation and position fixing systems, including aircraft identification, four
 dimensional.position.and.additional.data.as. appropriate.. (.3.).Audio.Distribution.System
 ADS-A  Automatic.Dependent.Surveillance–Address.. (aka.ADS-C)
 ADS-B  Automatic.Dependent.Surveillance–Broadcast
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