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A

AB —  AD —  AF —  AH —  AN —  AR —  AT —  AU

ACRONYM

DEFINITION

CONTRIBUTOR

A&A	Astronomy and Astrophysics (Journal)	Goddard
A&AS	Astronomy and Astrophysics Supplement (Journal)	Goddard
A&E	Architect-Engineer	Goddard
A&R	Automation & Robotics	CASI
A&SG	Avionics and Surveillance Group	Goddard
A&V	Acceptance and Verification	Goddard
A&V	Assembly and Verification	Goddard
A/D	Analog to Digital	Goddard
A/O	Atomic Weight Percent	CASI
A/SA	Arid/Semi-Arid	Goddard
AA	Associate Administrator	Goddard
AA&HP	Aerodynamics, Aerothermodynamics, and Hypersonic Propulsion	Langley
AAAS	American Association for the Advancement of Science	CASI
AAAV	Advanced Amphibious Assault Vehicle	CASI
AAB	Army Aviation Board, Fort Rucker, AL	CASI
AAC	Aeronautics Advisory Council	Langley
AAC	Advanced Airspace Concept	CASI
AACB	Aeronautics and Astronautics Coordinating Board	CASI
AACM	Average Absolute Control Movement	CASI
AACS	Attitude and Articulation Control Subsystem	CASI
AACS	Automated Airspace Computer System	Goddard
AADB	Army Air Defense Board, Fort Bliss, TX	CASI
AADSF	Advanced Automated Directional Solidification Furnace	CASI
AAE	Average Absolute Error	CASI
AAEE	Aeroplane and Armament Experiment Establishment (Great Britain)	CASI
AAESWB	Army Airborne, Electronics and Special Warfare Board, Fort Bragg NC	CASI
AAFB	Andrews Air Force Base	Goddard
AAFE	Advance Applications Flight Experiment Program;	CASI
AAFE	Aero Assist Flight Experiment	CASI
AAH	Advanced Attack Helicopter	CASI
AAH	Automatic Attitude Hold (Space Shuttle)	CASI
AAL	Arctic Aeromedical Lab., Fort Wainwright, AK	CASI
AAM	Application Activity Model	CASI
AAM	Atmospheric Angular Momentum	Goddard
AAOE	Airborne Antarctic Ozone Experiment	CASI
AAP	Affirmative Action Plan	CASI
AAP	Apollo Applications Program	Goddard
A-AR	Army Artillery Board, Fort Sill, OK	CASI
A-ARM	Army Armor Board, Fort Knox, KY	CASI
AAS	Advanced Automated System	Langley
AAS	American Astronautical Society	CASI
AASE	Airborne Arctic Stratospheric Expedition	CASI
AATB	Army Arctic Test Board, Fort Greely, AK	CASI
AATSR	Advanced Along-Track Scanning Radiometer (ESA)	Goddard
AATT	Advanced Air Transportation Technologies	CASI
AAUW	American Association of University Women	Langley
AAVSO	American Association of Variable Star Observers	CASI
		back to top
AB	Advanced Bus	Goddard
AB/CV	Aerobrake/Carrier Vehicle (AFE)	Langley
ABA	Aberrated Beam Analyzer	Goddard
ABACUS	Architecture and Building Aids Computer Unit	CASI
ABC	Activity Based Costing	Langley
ABCR	As Built Configuration Report	Goddard
ABF	Air Bearing Floor	Goddard
ABIL	Airborne Beacon Interference Locator	CASI
ABL	Allocated Baseline	CASI
ABL	Army Biological Labs., Frederick, MD	Goddard
ABLE	Amazon Boundary Layer Expedition	Langley
ABLE	Atmospheric Boundary Layer Experiment	Langley
ABLE	Amazon Boundary Layer Experiment	CASI
ABM	Apogee Boost Motor	CASI
ABPL	As-Built Parts List	Goddard
ABS	Oxygen A-Band Spectrometer	CASI
ABS	Acrylonitrile Butadiene Styrene	Goddard
ABW	Antarctic Bottom Water	Goddard
AC	Alternating Current	CASI
AC	Atmospheric Corrector	Goddard
AC	Atlas Centaur (Intermediate class expendable launch vehicle)	Goddard
AC&S	Attitude Control and Stabilization	CASI
ACA	Associate Contractor Agreement	CASI
ACA	Attitude Control Assembly (Space Station)	Goddard
ACAD	Attitude Control and Determination	Goddard
ACARS	Aircraft Communications Addressing and Reporting System (IEEE)	Langley
ACARS	ARINC (Aeronautical Radio, Inc.) Communications Addressing and Reporting Systems	CASI
ACC	Aeronautics Advisory Committee	CASI
ACC	Air Combat Command	Langley
ACC	Antarctic Circumpolar Current	Goddard
ACC	Aft Cargo Carrier (Space Shuttle)	Goddard
ACCENT	Autogenetically-Controlled Cesium (or Colloid) Electro-Nuclear Thrust system	CASI
ACCESS	Advanced Cosmic-Ray Composition Experiment (Space Station)	Goddard
ACCESS	Assembly Concept for Construction of Erectable Space Structure	CASI
ACCS	Active Contamination Control System	CASI
ACD	Anti-Coincidence Detector	CASI
ACD	Architecture Control Document	Goddard
ACDS	Attitude Control and Data System	Goddard
ACDTR	Airborne Central Data Tape Recorder	CASI
ACE	Acceptance Checkout Equipment	CASI
ACE	Active Control Aircraft	CASI
ACE	Actuator Control Electronics	Goddard
ACE	ADR Control Electronics	Goddard
ACE	Advanced Composition Explorer	Goddard
ACE	Array Clamp Electronics	Goddard
ACE	Attitude Control Electronics	Goddard
ACerS	American Ceramic Society	Glenn
ACES	Acoustic Containerless Experiment System	CASI
ACES	Airspace Concept Evaluation System	CASI
ACF	Advanced Communications Facility	Langley
ACF	Autocorrelation Function	CASI
ACFS	Advanced Concepts Flight Simulator	CASI
ACGI	Advanced Computer-Generated Image	Langley
ACHE	ADR Control and Housekeeping Electronics	Goddard
ACIC	Aeronautical Chart and Information Center (AF), St. Louis, MO	CASI
ACIP	Aerodynamic Coefficient Identification Package (NASA)	Langley
ACIP	Aerodynamic Coefficient Instrumentation Package (Space Shuttle)	CASI
ACK	Acknowledge Message	Goddard
ACLS	Advance Cardiac Life Support	CASI
ACLS	Air Cushion Landing System	CASI
ACLS	Automated Control and Landing System	CASI
ACLS	Automatic Carrier Landing System	CASI
ACM	Advance Cruise Missile	CASI
ACM	Aerodynamic Configured Missile	CASI
ACM	Air Combat Maintenance	CASI
ACM	Air Combat Maneuvering	CASI
ACM	Air Conditioning Machine	CASI
ACM	Association for Computing Machinery	Langley
ACM	Augmented Counter Machine	CASI
ACO	Administrative Contracting Officer	Goddard
ACOE	Army Corps of Engineers	Goddard
ACOSS	Active Control of Space Structures	CASI
ACP	Affordable Composites for Propulsion	CASI
ACP	Alternate Command Plan	Goddard
ACP	Archive Control Process	Goddard
ACP	Area Command Post	CASI
ACPS	Attitude Control Propulsion System	CASI
ACR	Active Cavity Radiometer	Langley
ACR	Active Cavity Radar	CASI
ACRC	Assured Crew Return Capability	CASI
ACRDL	Army Chemical Research and Development Labs., Army Chemical Center, MD	CASI
ACRIM	Active Cavity Radiometer Irradiance Monitor	CASI
ACRIMSAT	Active Cavity Radiometer Irradiance Monitor Satellite	Goddard
ACRS	Automated Conflict Resolution System	Goddard
ACRV	Assured Crew Return Vehicle (Aerospace)	Langley
ACS	Advanced Camera for Surveys	Goddard
ACS	Advanced Concepts Simulator	Langley
ACS	American Chemical Society	Glenn
ACS	Attitude Control Subsystem	Goddard
ACS	Attitude Control System	Goddard
ACS/COM	Attitude Control System/Communications	CASI
ACSC	Aegis Combat Systems Center	Goddard
ACSH	Avionic and Control System Hardware	CASI
ACSIL	Admiralty Centre for Scientific Information and Liaison (Great Britain)	CASI
ACSSB	Amplitude Companded Single Sideband	CASI
ACSYS	Arctic Climate System Study	Goddard
ACT	Active Control Technology (or Technique)	Langley
ACT	Advanced Component Technologies	CASI
ACT	Advanced Composites Technology	Langley
ACT	Active Control Technology (control systems)	Goddard
ACT	Advanced Concepts Test	CASI
ACT	Attitude Control Thrusters	CASI
ACTH	Adrenocorticotropin	CASI
ACTIVE	Advanced Control Technology for Integrated Vehicles	CASI
ACTL	Automated Compatibility Test Laboratory	Goddard
ACTS	Advanced Civil Transport Simulator	Langley
ACTS	Advanced Communication Technology Satellite Program	Langley
ACTS	Advanced Communications Technology Satellite	CASI
ACV	Air Cushion Vehicle (Ground effect machine; includes hovercraft)	CASI
ACWP	Actual Cost of Work Performed	CASI
ACWP	Actual Cost of Work Performance	Goddard
ACY	Atlantic City (New Jersey) (Airport Symbol)	Langley
ACZCS	Advanced Coastal Zone Color Scanner	CASI
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AD	Analog Devices	CASI
AD	Aperture Door	Goddard
AD	Animal Development (Genetics)	Goddard
AD/AB	As-Designed versus As-Built	Goddard
ADA	Ancillary Data Access	Goddard
ADA	Array Drive Assembly	Goddard
ADA	Automatic Data Acquisition	Langley
AD-A	Automatic Gain Control (AGC)	CASI
ADABAS	Adaptable Database System	Langley
ADACS	Attitude Determination and Control Subsystem	Goddard
ADAPT	Adaptive Data Analysis and Processing Technology	Langley
ADAPT	Approach for Data Management, Archive, Protection, and Transmission	Langley
ADAS	Architecture Design and Assessment System	Langley
ADASP	Air Defense Annual Service Practice; Automatic Data and Select Program	CASI
ADASS	Astronomical Data Analysis Software and Systems	Goddard
ADB	Applications Development Branch	Goddard
ADC	Aerospace Defense Command	CASI
ADC	Affiliated Data Center	CASI
ADC	Air Defense Command, Colorado Springs, CO	CASI
ADC	Analog to Digital Converter	CASI
ADC	Automatic Deviation Control	CASI
ADCLS	Automated Data Collection and Location System	CASI
ADCS	Attitude Determination and Control System	Goddard
ADD	Architectural Design Document	CASI
ADD	Architecture Description Document	Goddard
ADD	Autonomous Dynamics Determination	Langley
ADD	Architectural Definition Document	Goddard
ADDS	Automatic Document Distribution Service	CASI
ADE	Array Drive Electronics	Goddard
ADEDS	Advance Digital Electronic Display	CASI
ADEOS	Advanced Earth Observing Satellite	CASI
ADEPT	Advanced Design Electronic Packaging Technique	Goddard
ADEU	Automatic Data Entry Unit	CASI
ADF	Automatic Direction Finding	CASI
ADI	Attitude Direction Indicator (Space Shuttle)	CASI
ADIRS	Air Data Inertial Reference System	Langley
ADISB	Australian Defense Information Services Branch	CASI
ADL	Ada Design Language	CASI
ADM	Administrative Message	Goddard
ADM	Angular Distribution Model	Goddard
admin	Administration (A publication)	Langley
ADMIN	Administration (or Administrator)	Langley
ADP	Automated Data Processing	CASI
ADP	Automatic Data Processor	CASI
ADP	Air Data Probe (Space Shuttle)	Goddard
ADP	Automatic Data Processing	Goddard
ADP/T	Automatic Data Processing and Telecommunications	Langley
ADPE	Automated Data Processing Equipment	Goddard
ADPE	Automatic Data Processing Equipment	Langley
ADR	Achievable Data Rate	CASI
ADR	Adiabatic Demagnetization Refrigerator	Goddard
ADS	Accelerator Driven System	CASI
ADS	Aerospace Data Systems	CASI
ADS	Altitude Decompression Sickness	CASI
ADS	Audio Distribution System (Space Shuttle)	CASI
ADS-B	Automatic Dependent Surveillance-Broadcast	CASI
ADSF	Advanced Directional Solidification Furnace	CASI
ADSP	Advanced Digital SAR Processor	CASI
ADT	Architectural Development Team	Goddard
ADV	Ascent/Descent Vehicles	CASI
ADVALM	Advanced Laminate Analysis Code	CASI
ADVENT	Ada Development Environment	CASI
ADVPCG	Advanced Protein Crystal Growth	CASI
AE	Atmospheric Explorer	Goddard
AE	Atmospheric Explorer (Satellite); Average Error	CASI
A-E	Architect & Engineer	Langley
AE	Ascent/Entry	Goddard
AEAP	Atmospheric Effects of Aviation Project	CASI
AEC	Architectural, Engineering, and Construction	CASI
AEC	Atomic Energy Commission, Washington, DC	Goddard
AECL	Atomic Energy of Canada, LTD.	CASI
AECMA	European Association of Aerospace Industries	Goddard
AED	Ammunition Engineering Directorate, Picatinny Arsenal, Dover, NJ	CASI
AEDC	Arnold Engineering Development Center, Arnold Airforce Station, TN	CASI
AEDP	Astrometry and Engineering Data Processing	Goddard
AEDU	Admiralty Experimental Diving Unit (Great Britain)	CASI
AEL	Admiralty Engineering Lab. (Great Britain)	CASI
AELR O	Army Electronics Logistics Research Office; see AELRDL	CASI
AELRDL	Army Electronic Research and Development Agency, Fort Monmouth, NJ	CASI
AEM	Analog Electronics Module	CASI
AEM	Analytical Electron Microscopy	Goddard
AEM Satellite	Applications Explorer Missions	CASI
AEP	Affirmative Employment Program	Langley
AEPG	Army Electronic Proving Ground Fort Huachuca, AZ	CASI
AEPI	Atmospheric Emissions Photometric Imaging	CASI
AERDA	Army Electronics Research and Development Activity (White Sands Missile Range, NM and Fort Huachuca, AZ)	CASI
AERDL	Army Engineer Research and Development Labs., Fort Belvoir, VA	CASI
AEREA	Association of European Research Establishments in Aeronautics	CASI
AERI	Atmospheric Emitted Radiance Interferometer	CASI
AEROENG	Aeronautical Engineering	CASI
AEROMED	Aerospace Medicine and Biology	CASI
AERONET	Aerosol Robotic Network	Goddard
AEROSAT	Aeronautical Communications Satellite	CASI
AESA	Active Electronically Scanned Array	CASI
AESA	Assign-and-Estimate Scheduling Algorithm	CASI
AESA	Atmospheric Effects of Stratospheric Aircraft	CASI
AESE	Airborne Electrical Support Equipment	Goddard
AESIM	Analog Electronics Simulator	Goddard
AESOP	Advanced End-to-end Simulation for Onboard Processing	CASI
AESOP	Aerodynamic Shape Optimization Program	CASI
AESOP	An Expert System for Shipboard Obscuration Prediction	CASI
AESOP	Army EMP (ElectroMagnetic-Pulse) Simulator Operations	CASI
AESOP	Automatic Engineering and Scientific Optimization Program	CASI
AESOP	Automatic Environmental Surface Observation Platforms	CASI
AESOPS	Antarctic Environment Southern Ocean Process Study	Goddard
AESP	Aerospace Education Services Program	Goddard
AET	Actual Evapo-Transpiration	Goddard
AETC	Accessory and Equipment Technical Committee	CASI
AETC	Air Education Training Command	CASI
AETD	Applied Engineering and Technology Directorate	Goddard
AEU	Analog Electronics Unit	Goddard
AEV	Air Force Operation Service (AFOS) Era Verification	CASI
AEWES	Army Engineer Waterways Experiment Station, Vicksburg, MS	CASI
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AF	Air Force	CASI
AF	Audio Frequency	Goddard
AF	Air Force, Department of	Goddard
AFAC	Air Force Armament Center, Eglin Air Force Base, FL	CASI
AFAL	Air Force Astronautics Laboratory	CASI
AFB	Air Force Base	Goddard
AFB	Award Fee Board	Langley
AFBMD	Air Force Ballistic Missile Division	CASI
AFBMD	Air Research and Development Command, Inglewood, CA	CASI
AFCCDC	AF Command and Control Development Center.	CASI
AFCCDD	Air Force Command and Control Development Div.	CASI
AFCCDD	Air Research and Development Command, Bedford, MA	CASI
AFCEA	Armed Forces Communications and Electronics Association	CASI
AFCO	Automatic Fuel Cutoff	CASI
AFCRL	Air Force Cambridge Research Lab., Bedford, MA	CASI
AFCS	Automatic Flight Control System (Aerospace)	Langley
AFD	Architecture Flow Diagrams	CASI
AFD	Aft Flight Deck (Space Shuttle)	Goddard
AFDD	AeroFlight Dynamics Directorate	CASI
AFE	Aeroassist Flight Experiment	CASI
AFE	American Flight Echocardiograph	CASI
AFETR	AF Eastern Test Range	CASI
AFF	Autonomous Formation Flyer	Goddard
AFFCI	A Formation Flying and Communication Instrument	Goddard
AFFDL	Air Force Flight Dynamics Laboratory (Wright-Patterson AFB, OH)	Langley
AFFTC	Air Force Flight Test Center, Edwards Air Force Base, CA	CASI
AFGE	American Federation of Government Employees	CASI
AFGL	Air Force Geophysics Laboratory	CASI
AFGWC	Air Force Global Weather Central (or Control)	Langley
AFIE	Aft Flow Ionization Experiment (AFE)	Langley
AFIT	Air Force Inst. of Tech., Wright-Patterson Air Force Base, OH	CASI
AFITV	Air Force Instrumented Test Vehicle (Anti-satellite target vehicle)	CASI
AFL	Abstract Family of Language	CASI
AFLs	Abstract Families of Languages	CASI
AFM	Actuated Folding Mirror	Goddard
AFM	Atomic Force Microscopy	CASI
AFM	Award Fee Milestone	Goddard
AFMDC	Air Force Missile Development Center, Holloman Air Force Base, NM	CASI
AFMTC	Air Force Missile Test Center, Patrick Air Force Base, Fla. (Later; AF Mission Test Center)	CASI
AFOE	Advanced Fiber Optic Echelle	CASI
AFOS	Air Force Operation Service; Automation of Field Operations and Service	CASI
AFOSR	Air Force Office of Scientific Research, Washington, DC	CASI
AFPCB	Armed Forces Pest Control Board, Washington, DC	CASI
AFPRL	Air Force Personnel Research Lab.	CASI
AFPRO	Air Force Plant Representative Office	Goddard
AFPS	Automated Forms Processing System	Goddard
AFPTRC	Air Force Personnel and Training Research Center, Lackland Air Force Base, TX; later Air Force Personnel Research Lab.	CASI
AFQA	Air Force Quality Assurance	Goddard
AFRPL	Air Force Rocket Propulsion Laboratory	CASI
AFS	Agency Filing Scheme	Langley
AFS	Andrew File System	Langley
AFSAWC	Air Force Special Air Warfare Center, Eglin Air Force Base, FL	CASI
AFSC	Air Force Systems Command, Washington, DC	CASI
AFSCF	Air Force Satellite Control Facility (Now known as the Space Test Center)	CASI
AFSCN	Air Force Satellite Control Network	Goddard
AFSPC	Air Force Space Programs Command	Goddard
AFSWC	Air Force Special Weapons Center, Kirtland Air Force Base, NM	CASI
AFT	Autogenic Feedback Training	CASI
AFTAC	Air Force Technical Application Center, Washington, DC	CASI
AFTI	Advanced Fighter Technology Integration	CASI
AFWAL	Wright Research and Development Center (2/89 new name)	Langley
AFWAL	Air Force Wright Aeronautical Labs.	CASI
AFWL	Air Force Weapons Laboratory	CASI
AGARD	Advisory Group for Aeronautical Research Development-Paris (France)	CASI
AGASP	Arctic Gas and Aerosol Sampling Project	CASI
AGATE	Advanced Gamma-ray Astronomy Telescope Experiment	CASI
AGATE	Advanced General Aviation Transport Experiment	CASI
AGB	Asymptotic Giant Branch (Stars)	CASI
AGBUL	AGARD Bulletin	CASI
AGC	Apollo Guidance Computer; Automatic Gain Control	CASI
AGC	Automatic Gain Control	Goddard
AGCE	Atmospheric General Circulation Experiment	CASI
AGCM	Atmospheric General Circulation Model	Goddard
AGCS	Advanced Guidance and Control System	Langley
AGCS	Allied Signal Guidance Control Systems	CASI
AGCS	Automatic Guidance and Control System	Goddard
AGE	Aerospace Ground Equipment	CASI
AGED	Advisory Group on Electron Devices	CASI
AGHBK	AGARD Handbook	CASI
AGHLT	AGARD Highlights	CASI
AGINX	AGARD Index to Publications	CASI
AGL	Above Ground Level	CASI
AGM	Anti-Gravity Machine	Goddard
AGMA	American Gear Manufacturers Association	CASI
AGN	Active Galactic Nuclei	CASI
AGNS	Automated Ground Network System	Goddard
AGP	AGRI Grain Power Project (Ethanol fuel from grains)	CASI
AGPA	Ammunition Group, Picatinny Arsenal, Dover, NJ	CASI
AGQT	AGARD Reports, A Quarterly Listing	CASI
AGRF	Artificial Gravity Research Facility	CASI
AGRISTARS	Agriculture and Resources Inventory Surveys Through Aerospace	CASI
AGS	Abort Guidance System; Alternating-Gradient Synchrotron	CASI
AGS	Advanced Geosynchronous Studies	Goddard
AGT	Automated Guideway Transit	CASI
AGTC	Airport Ground-Traffic Control	CASI
AGU	American Geophysical Union	Goddard
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AH	Upper Eight Bits of AX	Langley
AHI	AMP Hour Integrator	Goddard
AHRS	Attitude Heading Reference System	CASI
AHS	American Helicopter Society	Langley
AHSE	Assembly and Handling Support Equipment	Goddard
AI	Action Item	CASI
AI	Artificial Intelligence	Goddard
AIAA	American Institute of Aeronautics and Astronautics	CASI
AIAA/TIS	American Institute for Aeronautics and Astronautics, Technical Information Service	Langley
AIAG	Automotive Industry Action Group	Goddard
AIC	Application Interpreted Construct	Goddard
AID	Ada Information Description	CASI
AID	Aerospace Information Div., Washington, DC (Library of Congress; became Aerospace Technology Div. before disbanding)	Goddard
AIDJEX	Arctic Ice Dynamics Joint Experiment	CASI
AIDS	Aircraft Integrated Data Systems	CASI
AIFTDS	Airborne Integrated Flight Test Data System	CASI
AIM	Airman’s Information Manual	CASI
AIM	Application Interpreted Model	Goddard
AIM	Assurance Implementation Matrix	Goddard
AIM	Astrometric Interferometry Mission	CASI
AIM	Atmosphere-Ionosphere-Magnetosphere	CASI
AIM	Automated Information Management (NASA)	Langley
A-INF	Army Infantry Board, Fort Benning, GA	CASI
AIP	Aerothermal Instrumentation Package (OEX)	Langley
AIP	American Institute of Physics	CASI
AIP	Assurance Implementation Plan	Goddard
AIPS	Astronomical Image Processing System	CASI
AIR	Atmospheric Ionizing Radiation	Langley
AIRM	Atmospheric Ionizing Radiation Measurement	Langley
AIRS	Advanced Inertial Reference Sphere	CASI
AIRS	Atmospheric Infrared Sounder	CASI
AIRSAR	Airborne Synthetic Aperture Radar	CASI
AIS	Application Interface Specification	CASI
AIS	Automated Information Security	Langley
AIS	Automated Information System	Langley
AIS	Airborne Imaging Spectrometer	Goddard
AISO	Automated Information Security Officer (replaced by ITSO)	Goddard
AIT	Assembly, Integration, and Test	Goddard
AIV	Assembly, Integration and Verification	CASI
AIX	Auxiliary Bus (HETE-2)	Goddard
AJ	Astronomical Journal	Goddard
AKR	Auroral Kilometric Radiation	CASI
AL	Air Lock	Langley
AL	Annual Leave	Goddard
ALADDIN	Advanced Large Area Detector Developments in InSb	CASI
ALADDIN	Atmospheric Layering and Density Distribution of IONS and Neutrons	Goddard
ALAE	Atmospheric Lyman-Alpha Emissions	CASI
ALARA	As Low As Reasonably Achievable	CASI
ALARM Project	Automatic Light Aircraft Readiness Monitoring Project	CASI
ALARR	Air Launch, Air Recoverable Rocket (Payload)	CASI
ALC	Acceptable Level of Competence	Goddard
ALC	Automatic Leveling Circuit	Goddard
ALC	IBM Assembly Language Code	Langley
ALDF	Aircraft Landing Dynamics Facility (LaRC)	Langley
ALEXIS	All-sky Extreme UV Imaging Survey	Goddard
ALFLEX	Automatic Landing Flight Experiment	CASI
ALFMED	Apollo Light-Flash Moving-Emulsion Detector	CASI
ALI	Advanced Land Imager	CASI
ALIAS	Aircraft Laser Infrared Absorption Spectrometer	CASI
ALICE	ALI Control Electronics	Goddard
ALNOT	Alert Notice	CASI
ALOS	Advanced Land Observation Satellite	Goddard
ALOS	Advanced Land Observing Satellite	CASI
ALPA	Air Line Pilots Association, International	Langley
ALRH	Apollo Lunar Radioisotope Heater	CASI
ALS	Advanced Launch System	CASI
ALS	Advanced Light Source	Goddard
ALS	Alternate Landing Site	CASI
ALS	Approach Light System	CASI
ALS	Archimedial Log Spiral	Goddard
ALS	Automated Library System	Langley
ALSE	Apollo Lunar Sounder Experiment	CASI
ALSEP	Apollo Lunar Surface Experiments Package	CASI
ALT	Altimeter	Goddard
alt	Altitude	CASI
ALT	Approach and Landing Test	CASI
ALTA	Aluminum Lithium Test Article	Langley
ALV	Advanced Launch Vehicle	Langley
AM	Ambulance Module	CASI
AM	Amplitude Modulation	CASI
AM	Analog Multiplexer	Goddard
AM	Ante Meridiem	Goddard
AM	Auxiliary Module	CASI
AM0	Air Mass Zero	CASI
AMAO	Advanced Missions Analysis Office	Goddard
AMASS	Archival Management and Storage System	Goddard
AMC-A	Army Material Command, Washington, DC (Later MDRC, Darcon)	CASI
AMC-AF	Air Materiel Command, Wright-Patterson Air Force Base, OH	CASI
AMCD	Annular Momentum Control Device (NASA)	Langley
AMCOM	Aviation and Missile Command (U.S. Army at NASA LaRC)	Langley
AMC-RA	Army Missile Command, Redstone Arsenal, Huntsville, AL	CASI
AMDS	Astrophysics Master Directory System (AMDS)	CASI
AME	Antenna Mounted Equipment	Goddard
AMF	Air Mass Factor	CASI
AMI	Active Microwave Instrument	CASI
AMI	Amplified MOS Imager	Goddard
AMIP	Atmospheric Model Intercomparison Project	Goddard
AML	Adaptive Maneuvering Logic	Langley
AML	Admiralty Materials Lab. (Great Britain)	CASI
AMLS	Advanced Manned Launch System (NASA)	Langley
AMLS	Array Microwave Limb Sounder	Goddard
AMMRC	Army Materials and Mechanics Research Center	CASI
AMMS	Advanced Materials Management System	CASI
AMMS	Advanced Microwave Moisture Sensor	Langley
AMMS	Advanced Microwave Moisture Sounder	Goddard
AMO	Assurance Management Office	CASI
AMOOS	Aeromaneuvering Orbit to Orbit Shuttle	CASI
AMOS	Air Force Maui Optical Station	CASI
AMP	Ampere (or Amperage) (Unit of electric current)	Langley
AMP	Assurance Management Plan	CASI
amp	ampere	Goddard
AMPA	Adaptive Multibeam Phased Array	CASI
AMPS	Atmospheric, Magnetospheric, and Plasmas-in-Space Payloads	CASI
AMPTE	Active Magnetospheric Particle Tracer Explorer	CASI
AMPTE	Active Mesospheric Particle Tracer Explorer	CASI
AMR	Advanced Microwave Radiometer	CASI
AMR	Altimetry Microwave Radiometer	Goddard
AMRA	Army Materials Research Agency, Watertown, MA (Later AMMRC - Army Materials and Mechanics Research Center)	CASI
AMRC	Auxiliary Master Reference Cube	Goddard
AMRL	Aeronautical and Maritime Research Lab, Australia	CASI
AMRL	Aerospace Medical Research Labs	CASI
AMRL	Army Medical Research Lab., Fort Knox, KY	CASI
AMRNL	Army Medical Research and Nutrition Lab., Denver, CO	CASI
AMRT	Time Division Multiple Access (TDMA in English)	CASI
AMS	Actuator Mechanism Subsystem	Goddard
AMS	Advanced Metallic Structures Program	CASI
AMS	Alpha Magnetic Spectrometer	Goddard
AMS	American Meteorological Society	CASI
AMS	Army Map Service, Washington, DC	CASI
AMS	Automated Management System	Goddard
AMSAT	Amateur Radio Satellite	CASI
AMSAT	Amateur Satellite Corp. (Radio)	Goddard
AMSB	Advanced Mechanism Selection Box	Goddard
AMSCAT	Airborne Microwave Scatterometer	CASI
AMSR	Advanced Microwave Scanning Radiometer	CASI
AMSR	Advanced Mechanically Scanned Radiometer	Goddard
AMSR-CU	Advanced Microwave Scanning Radiometer – Control Unit	Goddard
AMSR-E	Advanced Microwave Scanning Radiometer for EOS	Goddard
AMSR-SU	Advanced Microwave Scanning Radiometer – Sensor Unit	Goddard
AMST	Advanced Medium STOL (Short Takeoff and Landing) Transport	Langley
AMST	Advanced Medium STOL Transport	CASI
AMSU	Advanced Microwave Sounding Unit	CASI
AMSU-A	Advanced Microwave Sounding Unit-A	Goddard
AMSU-B	Advanced Microwave Sounding Unit-B	Goddard
AMT	Accelerated Mission Testing	CASI
AMTC	Army Missile Text Center, White Sands Missile Range, NM	CASI
AMTEC	Alkali Metal Thermoelectric Converter	CASI
AMTED	Army Missile Test and Evaluation Directorate, White Sands Missile Range, NM	CASI
AMTS	Advanced Moisture and Temperature Sounder	CASI
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ANFLOW	Anaerobic upFLOW (Bioreactors)	CASI
ANG	Air National Guard	CASI
ANIP	Army-Navy Instrumentation Program	CASI
ANL	Argonne National Laboratory	CASI
ANL	Army Natick Labs., MA	Goddard
ANOPP	Aircraft Noise Prediction Program	CASI
ANOVA	Analysis of Variance	CASI
ANS	Astronomical Netherlands Satellite	CASI
ANSI	American National Standards Institute	CASI
AO	Adaptive Optics	CASI
AO	Administrative Officer	Langley
AO	Announcement of Opportunity	CASI
AO	Atomic Orbital	CASI
AO	Atomic Oxygen	CASI
AOA	Abort-Once-Around (Space Shuttle)	CASI
AOC	Airline Operations Center	CASI
AOC	Award of Contract	Goddard
AOCI	Airborne Color Imager	CASI
AOCS	Attitude and Orbital Control System	CASI
AOD	Aerosol Optical Depth	CASI
AOIPS	Atmospheric and Oceanographic Information Processing System	CASI
AOL	Admiralty (Great Britain)	CASI
AOL	Airborne Oceanographic Lidar	CASI
AOL	Airborne Oceanographic LIDAR (Light Detection and Ranging)	Langley
AOPA	Aircraft Owners and Pilots Association	CASI
AOS	Acousto-Optic Spectrometer	Goddard
AOS	Acquisition of Signal	Goddard
AOS	Acquisition of Signal (Space Shuttle)	CASI
AOS	Advanced Orbiting System	Goddard
AOSO	Advanced Orbiting Solar Observatory	CASI
AOST	Anomalies in Ocean Surface Temperature	CASI
AOTF	Acousto-Optical Tunable Filter	CASI
AOTV	Aeroassist Orbital Transfer Vehicle	CASI
AOTV	Aeroassisted Orbital Transfer Vehicle	Langley
AP	Application Protocol	Goddard
Ap	Geomagnetic Activity Index	CASI
AP	Application Processor	Goddard
APA	Allowance for Program Adjustment	Goddard
APA	Allowance for Project Adjustment	Langley
APAE	Artificial Payload Accommodation Equipment	CASI
APAR	Absorbed Photosynthetically Active Radiation	Goddard
APAS	Aerodynamic Preliminary Analysis System	Langley
APAS	Automated Pilot Advisory System	CASI
APC	Aft Power Controller (Space Shuttle)	CASI
APC	Aircraft Pilot Control	CASI
APC	All-Purpose Carrier	CASI
APC	Aromatic Polymer Composite	CASI
APCGF	Advanced Protein Crystal Growth Facility	CASI
APD	Avalanche Photo Diode	CASI
APDE	Application Protocol Development Environment	Goddard
APE	Attitude and Power Electronic	CASI
APE	Aurora Photography Experiment	Goddard
APEL	Aeronautical Photographic Experimental Lab., Naval Air Development Center, Johnsville, PA	CASI
APEX	Advanced Photovoltaic and Electronics Experiment	CASI
APEX	Aerodynamic Performance Experiment (AFE)	Langley
APEX	Automated Power Expert	Goddard
APG	Aberdeen Proving Ground, MD	CASI
APGC	Air Force Proving Ground Command, Eglin Air Force Base, FL	CASI
API	Applications Programming Interface	CASI
APICS	Awaiting Pickup System	Goddard
APID	Application Process Identification	Goddard
APL	Applied Physics Laboratory	CASI
APL	Applied Physics Laboratory (at Johns Hopkins University)	Goddard
APL	Approved Parts List	Goddard
APM	Ascent Particle Monitor	CASI
APO	Apogee	CASI
APO	Apollo Program Office	CASI
APOP	Automated Program Operating Plan	Goddard
APP	Agency Peculiar Property	Goddard
APPL	(NASA’s) Academy for Program and Project Leadership	CASI
APPL	Academy for Program and Project Leadership (formerly PPMI)	Goddard
APPR	Army Package Power Reactor	CASI
APR	Agency Procurement Request	Langley
APRL	Army Prosthetics Research Lab., Walter Reed Army Medical Center, Washington, DC	CASI
APRO	Army Personnel Research Office (of the Chief, Research and Development), Washington, DC	CASI
APS	Advanced Photon Source	Goddard
APSE	Ada Programming Support Environment	CASI
APT	Automatic Picture Transmission (NASA)	Langley
APT	Automatic Picture Transmission	CASI
APTS	ACDS APSE Test Set	Goddard
APU	Agrophysical Units	CASI
APU	Arithmetic Processing Unit	Goddard
APU	Auxiliary Power Unit (Space Shuttle)	CASI
APV	Auxiliary Power Unit	Goddard
APW	Augmented Plane Wave (Method)	CASI
AQAHW	Algorithm QA Hardware	Goddard
AQAHWCI	Algorithm Quality Assurance Hardware Configuration Item	Goddard
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AR	Acceptance Review	Goddard
AR	Active Region	Goddard
AR	Anti-Reflection	Goddard
AR	Archival Researcher	Goddard
AR	Anomaly Report	Goddard
AR&D	Autonomous Rendezvous and Docking	CASI
ARA	Appletalk Remote Access	Langley
ARAA	Annual Review of Astronomy and Astrophysics	Goddard
ARABSAT	Arab Satellite (Communications satellite of the Arab Satellite Communications Organization)	CASI
ARAC	Radar Approach Control Facility (USA)	CASI
ARAMIS	Automation, Robotics, and Machine Intelligence System	CASI
ARAPS	Angular Resolved Auger Parameter Spectroscopy	CASI
ARAPT	Advanced Research Agency Project Tempo	CASI
ARAR	Accident Risk Assessment Range	Goddard
ARAR	Accident Risk Assessment Report	Goddard
ARB	Anomaly Response Board	Goddard
ARB	Anomaly Review Board	Goddard
ARC	Aeronautical Research Council, (Great Britain)	CASI
ARC	Aggregation of Red Cells (Low-g experiment; Ames Research Center	CASI
ARC	Ames Research Center (Moffett Field, CA)	Langley
ARCS	Aft Reaction Control System (Space Shuttle Subsystem)	CASI
ARCS	Automated Raster Cartography System	CASI
ARD	Atmospheric Reentry Demonstrator	Goddard
ARDEC	Armament Research Development and Engineering Center	CASI
ARE	Array Regulator Electronics	Goddard
AREAS	Altimeter Return Echo Analysis System	Goddard
AREP	Aerospace Research/Education Program	Goddard
ARES	Automated Reliability Estimation System	Langley
ARESE	Atmospheric Radiation Measurement Enhanced Shortwave Experiment	Langley
ARF	Animal Research Facility	CASI
ARGOS	Argos Data Collection and Position Location System	Goddard
ARI	Advanced Rigid Insulation	Langley
ARI	Aileron to Rudder Interconnect	CASI
ARIES	Airborne Research Integrated Experiments System	Langley
ARIES	Advanced Radar Information Evaluation System	CASI
ARIN	Aerospace Research Information Network	CASI
ARINC	Aeronautical Radio, Inc.	CASI
ARIP	Automatic Rocket Impact Predictor	CASI
ARIS	Advanced Ranger Instrumentation Ship	CASI
ARISE	Advanced Radio Interferometry between Space and Earth	Goddard
ARISTOTELES	Applications and Research Involving Space Technologies Observing the Earth’s Field from Low Earth Orbiting Satellite	Goddard
ARL	6571st Aeromedical Research Lab., Holloman Air Force Base, NM;	CASI
ARL	Admiralty Research Lab. (Great Britain);	CASI
ARL	Aeronautical Research Lab., Office of Aerospace Research,Wright-Patterson Air Force Base, OH	CASI
ARL	Air Resources Laboratory	CASI
ARL	Army Research Laboratory (U.S. Army at NASA LaRC)	Langley
ARM	Application Reference Model	Goddard
ARM	Array Regulator Module	Goddard
ARM	Atmospheric Radiation Measurement (DOE program)	Goddard
ARMA	AutoRegressive Moving Average	CASI
ARMAR	Airborne Rain Mapping Radar	CASI
ARMAX	AutoRegressive Moving Average eXogenous (models)	CASI
ARMS	Automated Requirements Management System SSF)	Langley
ARNICA	ARcetri Near Infrared CAmera	CASI
ARO	After Receipt of Order	Goddard
AROD	Airborne Range and Orbit Determination	CASI
AROD	Airborne Remotely Operated Device	CASI
AROD	Army Research Office, Durham, NC	CASI
ARPA	Advanced Research Projects Agency, Washington, DC (Later DARPA - Defense Advanced Research Projects Agency)	CASI
ARPA NET	Advanced Research Projects Agency Network (DOD)	CASI
ARQ	Automatic Repeat-Request	CASI
ARS	Agricultural Research Service, Watkinsville, GA	CASI
ARS	American Rocket Society (Later AIAA - American Institute for Aeronautics and Astronautics)	CASI
ARS	Atmospheric Revitalization System (Space Shuttle)	CASI
ARSR	Air Route Surveillance Radar	CASI
ART	Aerospace Research and Technology	Langley
ART	Alternate Resonance Toning	CASI
ART	Ambiguity Reference Tone	CASI
ARTCC	Air Route Traffic Control Center	CASI
ARTEMIS	Automated Reporting, Tracking, and Evaluation Management Information System	CASI
ARTS	Automated Radar Terminal System	CASI
ARTSS	Advanced Real-Time Simulation Subsystem	Langley
ARTT	Above Real-Time Training	CASI
ARW	Aeroelastic Research Wing	CASI
ARW	Angle Random Walk	Goddard
AS	Aft Shroud	Goddard
AS&CS	Airborne Systems and Crew Station	Langley
AS&RS	Atmospheric Science and Remote Sensing	Langley
ASA	Acetylsalicylic Acid	CASI
ASA	The Acoustical Society of America	Langley
ASAC	Allied Signal Aerospace Corporation	Goddard
ASAC	Aviation Systems Analysis Capability	Langley
ASALM	Advanced Strategic Air Launched Missile	CASI
ASAP	Aeronautics and Space Access Page	CASI
ASAP	Ariane Structure for Auxiliary Payloads	Goddard
ASAP	As Soon As Possible	Goddard
ASAR	Advanced Synthetic Aperture Radar (ESA)	Goddard
ASAS	Advanced Solid State Array Spectroradiometer;	CASI
ASAS	Aerodynamic Stability Augmentation System	CASI
ASC	Aeronautical Systems Center	CASI
ASC	Aerospace Systems Center	CASI
ASC	Air Service Command	CASI
ASC	Air Systems Command	CASI
ASC	Aquatic Research Facility	CASI
ASCA	Advanced Satellite for Cosmology and Astrophysics	Goddard
ASCA	Japanese/U.S. X-ray Mission (1993 - 2000)	CASI
ASCA	Advanced Spacecraft for Cosmology Astrophysics	Goddard
ASCE	American Society of Chemical Engineers	CASI
ASCG	Automatic Solution Crystal Growth	CASI
ASCII	American Standard Code for Information Interchange	CASI
ASCR	Advanced Sodium Cooled Reactor	CASI
ASCS	Aft Shroud Cooling System	CASI
ASCS	Agricultural Stabilization and Conservation Service	Goddard
ASCSS	Automatic Spacecraft Configuration Status System	Goddard
ASCVR	As Shipped Configuration Verification Report	Goddard
ASD	Aeronautical Systems Div.,	CASI
ASD	Air Force Systems Command (AFSC), Wright-Patterson Air Force Base, OH	CASI
ASDE	Airport Surface Detection Equipment (Radar)	CASI
ASE	Aeroservoelasticity	CASI
ASE	Airborne Support Equipment	Goddard
ASE	Amplified Spontaneous Emission	CASI
ASE	Automotive Sterling Engine	CASI
ASE	Autonomous Spacecraft Experiment	CASI
ASE	AC Shaker Electronics	Goddard
ASEB	Aeronautics and Space Engineering Board	CASI
ASEE	American Society for Engineering Education	CASI
ASEM	Assembly of Station by Extravehicular Activity Methods	CASI
ASENT	Automatic System Excess Noise Temperature	CASI
ASF	Alaska SAR Facility	CASI
ASHOE	Airborne Southern Hemisphere Ozone Experiment	CASI
ASHOE/MAESA	Airborne Southern Hemisphere Ozone Experiment / Measurements of the Atmospheric Effects of Stratospheric Aircraft Experiment	CASI
ASI	Advanced Science Instrument	Goddard
ASI	Ampere-Second Integration	Goddard
ASI	Arc Second lmager	Goddard
ASI	Axial Scientific Instrument	Goddard
ASIC	Application Specific Integrated Circuit	Goddard
ASIP	Aircraft Structural Integrity Program	Langley
ASIPE	Axial Scientific Instrument Protective Enclosure	Goddard
ASIS	American Society for Information Science (formerly ADI)	Langley
ASIS	Axial Scientific Instrument Simulator	Goddard
ASIST	Advanced System for Integration and Spacecraft Test	Goddard
ASIST	Advanced Spacecraft Integration and Systems Test	Goddard
ASME	American Society of Mechanical Engineers	CASI
ASME	American Support Material and Equipment	Goddard
ASO	Advanced Solar Observatory	CASI
ASO	Australian Space Office	Goddard
ASOS	Automated Surface Observing System	CASI
ASP	Analog Signal Processing	CASI
ASP	Astronomical Society of the Pacific	CASI
ASP	Attached Shuttle Payload	CASI
ASP	Accelerated String Processor	Goddard
ASP	Airspace Systems Program	Goddard
ASP	Attitude Sensor Package	Goddard
ASPC	Attached Shuttle Payload Center	Goddard
ASQC	American Society for Quality Control	Goddard
ASR	Accelerated Successive Replacement	CASI
ASR	Advanced Surveillance Radar	CASI
ASR	Air Surveillance Radar	CASI
ASR	Airport Surveillance Radar	CASI
ASR	American Society of Rocketry	CASI
ASRB	Airworthiness Safety Review Board	Langley
ASRDI	Aerospace Safety Research & Data Institute (NASA-LEWIS)	CASI
ASRM	Advanced Solid Rocket Motor	CASI
ASRO	Atomic Short Range Order	CASI
ASRPA	Army Signal Radio Propagation Agency, White Sands Missile Range, NM	CASI
ASSB	Apollo Site Selection Board (NASA)	CASI
ASSET	Aerothermodynamic (Elastic) Structural Systems Environmental Tests	CASI
assy	assembly	CASI
AST	Administrative Support Technology	Langley
AST	Advanced Subsonic Technology	Langley
AST	Aerospace Technologist	CASI
AST	Aero-Space Technologist (or Technology) (NASA)	Langley
AST	Astrometry Science Team	CASI
AST	Autonomous Star Tracker	CASI
AST	Advanced Supersonic Transport	Goddard
AST	Aeronautics and Space Technology Program	Goddard
AST	Autonomous Star Tracker	Goddard
AST/VCE	Acoustic Shield Thermal/Variable Cycle Engine (Aircraft engine)	CASI
ASTAR	Assessment Schedule Tracking Accountability Reporting	Goddard
ASTD	Advanced Systems and Technology Department	Goddard
ASTEC	Advanced Solar Turbo Electric Conversion	CASI
ASTER	Advanced Spaceborne Thermal Emission and Reflection Radiometer	CASI
ASTEX	Atlantic Stratocumulus Transition Experiment.	CASI
ASTF	Aeropropulsion Systems Test Facilities	CASI
ASTF	Aerospace Structures Test Facility (AF)	CASI
ASTIF	Advanced FL Computer Software Test and Integration Facility	Goddard
ASTM	American Standard of Testing Materials	Langley
ASTM	American Society for Testing and Materials	CASI
ASTOVL	Advanced Short Takeoff and Vertical Landing (aircraft)	CASI
ASTP	Advanced Space Transportation Program	CASI
ASTP	Advanced Systems Technology Program	CASI
ASTP	Apollo-Soyuz Test Project (USSR./US)	CASI
ASTRO	(Program designed to obtain ultraviolet (UV) data on astronomical objects using a UV telescope)	CASI
ASTRO	Astrophysics Space Observatory	Goddard
ASTRO-E	Japan’s Fifth X-ray Astronomy Mission	Goddard
ASTROMAG	Astrophysics Magnetic Spectrometer Facility	CASI
ASTROS	Advanced Star/Target Reference Optical Sensor	CASI
ASTROS	Aleph STrip Read-Out Scanner	CASI
ASTROS	Automated STRuctural Optimization System	CASI
ASTRO-SPAS	(European cross-bay carrier)	CASI
ASTV	Aeroassisted Space Transfer Vehicles	CASI
ASVT	Applications Systems Verification Test (NASA)	CASI
ASW	Address and Synchronization Word	Goddard
ASWE	Admiralty Surface Weapons Establishment (Great Britain)	CASI
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AT	Acceptance Test	Goddard
AT	Aliveness Test	Goddard
AT	Astrometry Team	Goddard
AT&T	American Telephone and Telegraph (Company)	CASI
ATA	Air Transport Association of America	CASI
ATAC	Army Tank-Automotive Command (or Center), Detroit, MI	CASI
ATARS	Advanced Tactical Air Reconnaissance System	CASI
ATARS	Automated Traffic Advisory and Resolution Service (Collision avoidance system - aviation)	CASI
ATB	Army Transportation Board, Fort Eustic, VA	CASI
ATBD	Algorithm Theoretical Basis Document	Goddard
ATBN	Amine-Terminated Butadiene-Acrylonitrile Rubber	CASI
ATC	Absolute Time Command	CASI
ATC	Active Thermal Control	Langley
ATC	Advanced Technical Center	Goddard
ATC	Air Traffic Control	Goddard
ATCAA	ATC Assigned Airspace	CASI
ATCAC	Air Traffic Control Advisory Committee (Dept. of Transportation)	CASI
ATCAS	Advanced Technology Composite Aircraft Structure	CASI
ATCCC	Air Traffic Control Command Center	CASI
ATCRBS	Air Traffic Control RADAR Beacon System	Langley
ATCRBS	ATC Radar Beacon System (Also referred to as Second Surveillance Radar - SSR)	CASI
ATCS	Active Thermal Control Subsystem (Space Shuttle)	CASI
ATCSCC	Air Traffic Control System Command Center	CASI
ATCT	Air Traffic Control Tower	CASI
ATD	Aerospace Technology Division (Library of Congress; formerly, Aerospace Information Division)	CASI
ATE	Automatic Test Equipment	CASI
ATE	Airborne Test Equipment	CASI
ATE	Automated Test Equipment	Goddard
ATECOM	Army Test and Evaluation Command Aberdeen Proving Ground, MD	CASI
ATEGG	Advanced Turbine Engine Gas Generator (AF)	CASI
ATF	Astrometric Telescope Facility	CASI
ATI	Area-Time-Integral	CASI
ATIC	Advanced Thin Ionization Calorimeter	Goddard
ATIS	Automated Terminal Information System (Aviation)	Langley
ATIS	Automatic Terminal Information Service (Aviation)	CASI
ATL	Advanced Technology Laboratory (NASA)	CASI
ATLAS	Abbreviated Test Language for All Systems	CASI
ATLAS	Atmospheric Laboratory for Applications and Science	CASI
ATLAS	Atmospheric Laboratory for Applications and Science (Shuttle exp)	Langley
ATLAS	Atmospheric and Terrestrial Laboratory for Applications in Space	Goddard
ATLID	Atmospheric LIDAR	Langley
ATM	Asynchronous Transfer Mode	CASI
ATM	Auxiliary Transport Module	CASI
ATM	Air Traffic Management	Goddard
ATM	Apollo Telescope Mount (NASA); Asynchronous Transfer Mode	Goddard
atm	atmosphere	CASI
ATMCP	Air Traffic Management Operational Concept Panel	CASI
ATMOS	Atmospheric Trace Molecule Spectroscopy (ATLAS)	Langley
ATMOS	Atmospheric Trace Molecules Observed by Spectroscopy	Langley
ATMS	Advanced Technology Microwave Sounder	CASI
ATMSDI	Air Traffic Management Software Development and Integration	CASI
ATN	Aeronautical Telecommunications Network	CASI
ATO	Abort-To-Orbit (Space Shuttle); Air Traffic Operations Service	CASI
ATOPS	Advanced Transport Operating Systems	CASI
ATP	Absolute Time Processor	CASI
ATP	Acceptance Test Procedure	Goddard
ATP	Authority to Proceed	Goddard
ATP	Automated Test Procedure	Goddard
ATP	Adenosine Triphosphate (Biochemistry)	Goddard
ATR	Acceptance Test Review	CASI
ATR	Assistant Technical Representative	CASI
ATR	Advanced Test Reactor	CASI
ATR	Air Transport Rating	CASI
ATR	Air Turbo Ramjet	Goddard
ATR	Air Turborocket	CASI
ATR	Attenuated Total Reflectance	Goddard
ATRC	Army Transportation Research Command, Fort Eustis, VA	CASI
ATS	Abstract Test Suite	CASI
ATS	Access to Space	CASI
ATS	Air Traffic Service	Langley
ATS	Applications Technology Satellite	CASI
ATS	Assembly Truss and Structure	Goddard
ATS	Attitude Transfer System	Goddard
ATSA	Access to Space Agents	Goddard
ATSC	Allied Signal Technical Services Corporation (now Honeywell)	Goddard
ATSD	Airborne Traffic Situation Display (FAA)	CASI
ATSIT	Automatic Techniques for the Selection and Identification of Targets	CASI
ATSP	Air Traffic Service Provider	CASI
ATSP	Asymmetric Traveling Salesman Problem	CASI
ATSR	Along Track Scanning Radiometer [on ERS-1 (ESA)]	Goddard
ATSSB	Advanced Technology Small Satellite Bus	Goddard
ATSSB	Advanced Technology Standard Satellite Bus	Goddard
ATT	Advanced Transport Technology	CASI
ATV	Automated Transfer Vehicle	CASI
ATV	All-Terrain Vehicle; Automated Transfer Vehicle	Goddard
ATVC	Ascent Thrust Vector Control	CASI
ATXS	ATM Transmission System	Goddard
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AU	Astronomical Unit	CASI
AURA	Association of Universities for Research in Astronomy	CASI
AUSSAT	Australian Communication Satellite	CASI
AUTOCON	Autonomous Navigation and Orbit Control	Goddard
AUTODIN	Automatic Digital Network	CASI
AUTO-GOSS	Automated Ground Operations Scheduling System	CASI
AUWE	Admiralty Underwater Weapons Establishment (Great Britain)	CASI
aux	auxiliary	CASI
AVCG	Automatic Vapor Crystal Growth	CASI
AVE	Atmospheric Variability Experiment (NASA)	CASI
AVF	Azimuthally Varying Field	CASI
AVGE	Average	Langley
AVGS	Advanced Video Guidance Sensor	CASI
AVHRR	Advanced Very High Resolution Radiometer	CASI
AVID	Advanced Visual Information Display	CASI
AVID	Aerospace Vehicle Interactive Design	CASI
AVID	Airborne Vehicle Identification	CASI
AVIRIS	Airborne Visible Infrared Imaging Spectrometer	CASI
AVIRIS	Airborne Visible and Infrared Imaging Spectrometer	Goddard
AVOSS	Aircraft Vortex Spacing System	CASI
AVPP	Adjustable Vent Port Plugs	CASI
AVSCOM	(US Army) Aviation Systems Command	CASI
AVST	Advanced Vehicle Simulation Technique	CASI
AVST	Automated Visual Sensitivity Tester	CASI
AvSTAR	Aviation System Technology Advanced Research	CASI
AVT	Applications Vertical Test Program (Communications satellite)	CASI
AWACS	Airborne Warning and Control System	CASI
AWCS	Agency-wide Coding Structure	Langley
AWG	American Wire Gauge	CASI
AWI	Assembly Work Instruction	Goddard
AWIPS	Advanced Weather Interactive Processing System	CASI
AWN	Angle White Noise	Goddard
AWOP	All-Weather Operations Panel (of ICAO)	CASI
AWOTS	Automated Wallops Orbital Tracking Station	Goddard
AWS	American Welding Society	Langley
AWS	Automatic Weather Station	CASI
AWS	Air Warning Service	Goddard
AWS	Air Weather Service, Scott Air Force Base, IL	CASI
ax	x-axis acceleration	CASI
AXAF	Advance X-Ray Astrophysics Facility (Great Observatory Program)	Langley
AXAF	Advanced X-ray Astrophysics Facility	Goddard
AXAF-R	Advanced X-ray Astrophysics Facility-Retrieval	CASI
AXIS	Access and Exchange Information System	Goddard
AXIS	Atmospheric X-ray Imaging Spectrometer	Goddard
ay	y-axis acceleration	CASI
az	azimuth, z-axis acceleration	CASI
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