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A Alert ANG Air National Guard A&E Airframe and Engine ANGB Air National Guard Base A&P Airframe and Power plant ANPRM Advanced Notice of Proposed Rule Making A/A Air to Air ANSI American National Standards institute A/B Afterburner ant antenna A/C Aircraft AOA Angle of Attack A/C Approach Control AOE Airport of Entry A/F Air-to-Fuel ratio AOPA Aircraft Owners and Pilots Association A/G Air to Ground ap approach or autopilot A/H Altitude or Height APA Allied Pilots Association A/P Autopilot APAPI Abbreviated Precision Approach Path Indicator A/S Airspeed apc approach AAAE American Association of Airport Executives APC Area Positive Approach AADC Approach and Departure Control APFA Association of Professional Flight Attendants AAF Army Air Force APFD Autopilot Flight Director AAI Angle of Approach Indicator APL Airport Lights AAI Arrival Aircraft Interval app approach AAS Advanced Automation System APP CON Approach Control AAS Airport Advisory Service APPM Accident Prevention Program Manager AAS American Astronautical Society approp appropriate AB Air Base approx approximately abbr abbreviation Apr April abnml abnormal apt airport abs absolute APU Auxiliary Power Unit AC Air Carrier AR Aspect Ratio AC Air Conditioning ARAC Army Radar Approach Control AC Alternating Current ARAC Aviation Rulemaking Advisory Committee AC Form Airman Certification Form ARB Air Reserve Base ACARS Aircraft Communications Addressing and Reporting System ARC Aeronautical Research Council ACAS Airborne Collision Avoidance System ARFF Aircraft Rescue Firefighting/equipment ACC Alternative Clearance Control ARINC Aeronautical Radio Incorporated (discrete frequency) ACC Air Coordinating Committee arngmt arrangement ACC Area Control Center ARO Airport Reservation Office ACCC Area Control Computer Complex ARP Airport Reference Point accel accelerate arpk airpark access accessory arpt airport accum accumulate arr arrival or arrive ACDO Air Carrier District Office ARS American Rocket Society AC Aviation Career Education ARSA Airport Radar Service Area acft aircraft ARSA Aeronautical Repair Station Association ACI Airport Council International ARSR Air Route Surveillance Radar ACLS Automatic Carrier Landing System ARTAS Air traffic control Radar Tracking And Server ACLT Actual Calculated Landing Time ARTCC Air Route Traffic Control Center ACN Airborne Classification Number ARTS Automated Radar Terminal System ACO Aircraft Certification Number ASAP As Soon As Possible AC Airlift Command Post ASD Aircraft Situation Display ACR Air Carrier ASDA Accelerate - Stop Distance Available ACR Air Corps Reserve ASDE Airport Surface Detection Equipment act actual ASEL Airplane Single-Engine Land ACT GS Actual Ground Speed ASES Airplane Single-Engine Sea actuat actuating ASF Additional Safety Factor actvt activate ASF Air Safety Foundation actvty activity ASI Aviation Safety Inspector AD Airworthiness Directive ASI Airspeed Indicator AD Apparent Drift ASL Above Sea Level ADAS Aircraft Departure and Arrival Sequencing ASLAR Aircraft Surge Launch And Recovery ADCUS Advise Customs ASME American Society of Mechanical Engineers ADF Automatic Direction Finder ASOS Automated Surface Observing System ADI Attitude Director Indicator ASP Arrival Sequencing Program ADIZ Air Defense Identification Zone asph asphalt adj adjacent or adjustable ASR Airport Surveillance Radar ADLY Arrival Delay ASR Altimeter Setting Region adm administration assn association ADM Aeronautical Decision Making asst assistant ADMA Aviation Distributors and Manufacturers Association ASTA Airport Surface Traffic Automation ADO Airport District Office ASTM American Society for Testing Materials ADR Advisory Route ATA Actual Time of Arrival ADS Air Data System ATA Air Transportation Association of America adv advisory ATA Airport Traffic Area AEEC Airline Electronic Engineering Committee ATA Aviation Training Association AEF American Expeditionary Forces ATAC Air Transport Association of Canada AEG Aircraft Evaluation Group ATC After Top Center aero aerodynamic or aeronautical ATC Air Traffic Control AESOP Aircraft, Environment, Situation, Operation, and Personnel ATCAA Air Traffic Control Assigned Airspace AF&E Airframe and Engine ATCCC Air Traffic Control Command Center AFA Air Force Association ATCO Air Taxi Commercial Operator AFB Air Force Base ATCRBS Air Traffic Control Radar Beacon System AFCEA Armed Forces Communications and Electronics Association ATCSCC Air Traffic Control System Command Center AFD Airport Facility Directory ATCT Airport Traffic Control Tower AFFF Aqueous Film Forming Foam ATD Actual Time of Departure AFI African-Indian Ocean region ATDC After Top Dead Center AFI Authorized Flight Instructor ATE Actual Time En route AFIS Aerodrome Flight Information Service ATE Automatic Test Equipment AFL Above Field Level ATEC Aviation Technician Education Council AFM Aircraft Flight Manual ATF Aerodrome traffic Frequency AFOVRN Air Force Overrun ATFM Air Traffic Flow Management AFR Actual Fuel Remaining ATHODYD Aerothermodynamic Duct AFSC Aggregate Friction Seal Coat ATIS Automatic Terminal Information Service AFSS Automated Flight Service Station ATLAS Abbreviated Test Language for Avionics Systems AFTI Advanced Fighter Technology Integration ATM Aerodynamic Twisting Moment AGB Accessory Gearbox ATM Air Traffic Management AGI Advanced Ground Instructor atmos atmosphere AGI Authorized Ground Instructor atnd attended AGL Above Ground Level atndt attendant agri agriculture ATP Airline Transport Pilot AH Artificial Horizon ATR Air Transport Radio AHS American Helicopter Society ATS Aeronautical Testing Services AI Attitude Indicator ATS Air Traffic Services AIA Aircraft Industries Association of America ATZ Aerodrome Traffic Zone AIAA American Institute of Aeronautics and Astronautics Aug August AIF Instrument Flight Instructor AUSA Association of the United States Army ail aileron auth authorized AIM Airman's Information Manual auto automatic AIP Aeronautical Information Publication AUTOB Automatic Observing station AIP Airport Improvement Program AUW all-Up Weight AIRMET Airman's Meteorological information aux auxiliary airpl airplane AVASI Abbreviated Visual Approach Slope Indicator AIS Aircraft Integrating System avbl available AIT Auto Ignition Temperature AVCOMM Aviation Communications AIT Automated Information Transfer avd avoid ALA Authorized Landing Area AVGAS Aviation Gasoline ALERFA Alert Phase avia aviation ALF Auxiliary Landing Field avn aviation ALNOT Alert Notice AVN Aviation Standards National field office ALPA Airline Pilots Association avt active ALS Approach Light System avtn aviation ALSF-I Approach Light System with sequenced Flashing lights aw airworthiness ALSF-II Approach Light System with sequenced Flashing lights and red side row bars the last 1000 ft AW&ST Aviation Week and Space Technology ALSTG Altimeter Setting AWG American Wire Gage alt alternate or altimeter AWIPS Advanced Weather Interactive Processing System altd altitude AWOS Automatic Weather Observing/reporting System altm altimeter AWR Airborne Weather Radar ALTRV Altitude Reservation AWW Severe Weather forecast Alert alum aluminum az azimuth AM Amplitude Modulation azm azimuth AMA Area Minimum Altitude AMASS Airport Movement Area Safety System amdt amendment AME Aviation Medical Examiner AMEL Airplane Multi-Engine Land AMES Airplane Multi-Engine Sea AMM Aircraft Maintenance Manual AMOS Automatic Meteorological Observing Station amp ampere AMSL Absolute Mean Sea Level AMT Aviation Maintenance Technician AMVER Automated Mutual-assistance Vessel Rescue system AN Air Force-Navy ANDB Air Navigation Development Board
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