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    4iRFourth Industrial Revolution
    a/cAircraft
    AAIBUKAir Accidents Investigation Branch
    AAMSUSAssociation of Air Medical Services
    AAPBUSAir Ambulance and Patient Billing
    AATDAdvanced Aviation Training Device
    AATDUSUS Army Aviation Applied Technology Directorate
    ABACEAsian Business Aviation Conference & Exhibition
    ACLCUSUS Army Aviation Center Logistics Support Command
    ACSFAuthorized Customer Service Facility
    ADAHRSAir Data and solid-state Attitude/Heading Reference System
    ADIAttitude Director Indicator
    ADS-BAutomatic Dependent Surveillance Broadcast
    AEDCUSArnold Engineering Development Center
    AETCUSAir Education and Training Command
    AFBAir Force Base
    AFCSAutomatic Flight Control System
    AFGSCUSAir Force Global Strike Command
    AFRLUSAir Force Research Laboratory
    AGWAlternate Gross Weight
    AHLCNChina Advanced Heavy Lift
    AHMECUSAmerican Helicopter Museum and Education Center
    AHRSAttitude and Heading Reference System
    AHSUSAmerican Helicopter Society International
    AHSAFAUSAmerican Helicopter Services & Aerial Firefighting Association
    AI/ADIAttitude Indicator
    AIBNNOAccident Investigation Board of Norway
    ALDSAerial Liquid Delivery System
    ALSAirborne Locator Systems
    AMCAuthorized Maintenance Center
    AMCMAirborne Mine CounterMeasures
    AMCNUSAirMedCare Network
    AMCOMUSUS Army Aviation and Missile Command
    AMLCDActive-Matrix Liquid Crystal Display
    AMNSAirborne Mine Neutralization System
    AMOUSCBP Air and Marine Operations
    AMROCAuthorized Maintenance Repair and Overhaul Center
    AMSAAUAustralian Maritime Safety Authority
    AOCAir Operator Certificate
    AOGAircraft on Ground
    AORArea Of Responsibility
    APASAdvanced Pilot Assistance System
    APUAuxiliary Power Unit
    AShMAnti-Ship Missile
    ATCAir Traffic Control
    ATMAir Traffic Management
    ATOApproved Training Organisations
    ATSBAUAustralian Transport Safety Bureau
    ATTCUS Aviation Technical Test Center
    AUVSIAssociation for Unmanned Vehicle Systems InternationalAUVSI
    AVCATTAviation Combined Arms Tactical Trainer
    AVDSAirborne Video Downlink System
    AVOAir Vehicle Operator
    AWPAerial Work Platform
    AWSARAll Weather Search and REscue
    B/UBroken Up
    B2BBusiness to Business
    BAAINBwDEFederal Office of Bundeswehr Equipment, Information Technology and In-Service Support
    BARSBasic Aviation Risk Standard Program
    BPSBallistic Protection System
    BTCWFSBallistic Tolerant Crash-Worthy Fuel System
    BVLOSBeyond Visual Line of Sight
    C-UASCounter-Unmanned Aerial System
    C4ISRCommand, Control, Computer, Communications, Intelligence, Surveillance and Reconnaissance
    CAACivil Aviation Authority
    CAACCNCivil Aviation Administration of China
    CAASUSCommon Digital Avionics Architecture
    CAMTSCommission on Accreditation of Medical Transport SystemsCAMTS
    CASAAUCivil Aviation Safety Authority
    CBTComputer Based Training
    CCDCUSUS Army Combat Capabilities Development Command
    CDICourse Deviation Indicator
    CDRCritical Design Review
    CFITControlled Flight Into Terrain
    CFTDContainerized Flight Training Device
    CGASUSCoast Guard Air Station
    CMDSCountermeasure Dispensing System
    CMHPCACanadian Maritime Helicopter Project
    CMLUCACormorant Mid-Life Upgrade
    CNATRAUSChief of Naval Air Training
    COECenter of Excellence
    COMFRCUSCommander, Fleet Readiness Centers
    CONUSUSContinental United States
    COOPContingency Of Operations Plan
    COTSCommercial Off-The-Shelf
    CR&OComponent Repair and Overhaul
    CRFSCrash Resistant Fuel System
    CRFTCrash Resistant Fuel Tank
    CSFCustomer Service Facility
    CTFCertified Training Facility
    CVFDRCombination of Cockpit Voice Recorder and Flight Data Recorder
    CVRCockpit Voice Recorder
    CVSCombined Vision System
    DARDesign Approval Representative
    DARAUKDefence Aviation Repair Agency
    DCMAUSDefense Contract Management Agency
    DCRDynamic Component Repair
    DFCDevelopment Flight Center
    DFESAUDepartment of Fire and Emergency Services
    DGAFRDirection Générale de l'Armement
    DIFFSDeck Integrated Fire Fighting System
    DMCDirect Maintenance Costs
    DMFDesignated Maintenance Facility
    DOADesign Organization Approval
    DRMOUSDefense Reutilization and Marketing Office
    DSCAUSDefense Security Cooperation Agency
    DSTAUDefence Science and Technology
    DVEDegraded Visual Environment
    DVESDegraded Visual Environment System
    EADIElectronic Attitude Director Indicator
    EASAEuropean Aviation Safety AgencyEuropean Commission
    EBACEEuropean Business Aviation Convention and Exhibition
    EBITEarnings Before Interest and Taxes
    EBITAEarnings Before Interest, Taxes, and Amortization
    EBTEvidence based Training
    EDAEuropean Defence Agency
    EDAUSExcess Defense Articles
    EDAElectronic Document Associate
    EFASExpeditionary Fluid Analysis System
    EFBElectronic Flight Bag
    EFIElectronic Flight Instruments
    EFISElectronic Flight Instrument System
    EFSEmergency Float System
    EFVSEnhanced Flight Vision Systems
    EGNOSEuropean Geostationary Navigation Overlay Service
    EGPWSEnhanced Ground Proximity Warning System
    EICASEngine Instruments and Crew Alert System
    EISEngine Indication System
    ELTEmergency Locator Transmitter
    EMAREuropean Defence Agency's European Military Airworthiness Requirements
    EMDElectronic Miscellaneous Document
    EMDEngineering Manufacturing Development
    EMFFEuropean Maritime and Fisheries Fund
    EMSEmergency Medical Service
    ENGElectronic News Gathering
    EO/IRElectro-Optical and Infrared
    EOIExpression of Interest
    EOSEmergency Oxygen System
    EPAEnvironmental Protection Agency
    EPAFEuropean Participating Air Forces
    ePCRElectronic Patient Care Records
    EPLBEmergency Personal Locator Beacon
    EPRCEuropean Personnel Recovery Center
    ERDFEuropean Regional Development Fund
    EREEmergency Response Exercise
    ERFSExtended Range Fuel System
    ERSUKEmployer Recognition Scheme
    ESGRUSEmployer Support of the Guard and Reserve
    ESIElectronic Standby Instrument
    ESSSExternal Stores Support System
    ETACEuropean Tactical Airlift Center
    EVSEnhanced Vision System
    FAAUSFederal Aviation AdministrationFAA
    FAIFédération Aéronautique Internationale
    FALFinal Assembly Line
    FARPForward Armament and Refueling Point
    FASGWUKFuture Anti-Surface Guided Weapon
    FATOFinal Approach and Take-Off
    FBOFixed Base Operator
    FCASFlight Control Actuation System
    FCOMFlight Crew Operating Manual
    FDIFlight Director Indicator
    FDMFlight Data Monitoring
    FDRFlight Data Recorder
    FEMAUSFederal Emergency Management Agency
    FFSFull Flight Simulator
    FIPSFull Ice Protection System
    FMCFull Mission Capable
    FMPFleet Management Program
    FMSUSForeign Military Sales
    FMSFlight Management System
    FOCACHFederal Office of Civil Aviation
    FOCFFree Operating Cash Flow
    FODForeign Object Damage
    FODRFlight Operations Documents Repository
    FOQAFlight Operations and Quality Assurance
    FOSTUKFlag Officer Sea Training
    FPCDUFlat Panel Control Display Unit
    FRAMPUSFleet Replacement Aviation Maintenance Program (US Navy)
    FRCEUSFleet Readiness Center East
    FRCSEUSFleet Readiness Center Southeast
    FRCSWUSFleet Readiness Center Southwest
    FSLForward Stocking Location
    FSTUSFleet Support Team
    FTDFlight Training Device
    GBASGround-Based Augmentation System
    GCCGulf Cooperation Council
    GLS GBAS Landing System
    GNSSGlobal Navigation Satellite System
    GPSGlobal Positioning System
    GPUGround Power Unit
    GSAUSGovernment Surplus Auctions
    GTOW Gross Takeoff Weight
    HAARHelicopter Air-to-Air Refueling
    HACCAHelicopter Association of Canada
    HADRHumanitarian Assistance and Disaster Relief
    HAPSHigh Altitude Pseudo-Satellite
    HARKHelicopter Aerial Rescue Kit
    HARTUSHelicopter Aquatic Rescue Teams
    HATSAUHelicopter Aircrew Training System
    HATWSHelicopter Terrain Avoidance and Warning System
    HDIHeading Indicator
    HDTSHelmet Display and Tracking System
    HECHuman External Cargo
    HEMSHelicopter for Emergency Medical Service
    HETSHuman External Transport (class D external load)
    HFDMHelicopter Flight Data Monitoring
    HHOHelicopter Hoist Operator
    HIFRHelicopter In-Flight Refueling
    HISLHigh Intensity Strobe Light
    HMDHelmet Mounted Display
    HMUHydromechanical Units
    HSIHorizontal Situation Indicator
    HSVTHelicopter Synthetic Vision Technology
    HTAWSHelicopter Terrain Awareness System
    HTAWS Helicopter Terrain Awareness and Warning System
    HTDHelicopter Training Device
    HUDHead-Up Display
    HUETHelicopter Underwater Escape Training
    HUMSHealth and Usage Monitoring System
    HWDHead Wearable Display
    IAACCTUSIllinois Association of Air and Critical Care Transport
    IBFInlet Barrier Filter
    ICRCInternational Committee of the Red Cross
    ICUIntensive Care Unit
    IDIQUSIndefinite Delivery / Indefinite Quantity
    IFRInstrument Flight Rules
    IGBIntermediate Gear Box
    IGWIncreased Gross Weight
    IHST International Helicopter Safety Team
    IIMCInadvertent Instrument Meteorological Conditions
    IMCInstrument Meteorological Conditions
    IMRHINIndian Multi Role Helicopter
    IOCInitial Operational Clearance
    IOCInitial Operational Capability
    IOGPInternational Association of Oil & Gas Producers
    IoTInternet of Things
    IOT&EInitial Operational Test and Evaluation
    IPPIntegration Pilot Program
    IS-BAOInternational Standard for Business Aircraft Operations
    ISOInternational Organization for Standardization
    ISRIntelligence, Surveillance and Reconnaissance
    ISSIn-Service Support
    ITECInternational Training and Education Conference
    IWSIntegrated Weapons System
    JRTCUSJoint Readiness Training Center
    JUONSUSJoint Urgent Operational Needs Statement
    KPPKey Performance Parameter
    KUHKRKorean Utility Helicopter
    LAHKRKorean Light Armed Helicopter
    LCHINIndian Light Combat Helicopter
    LCHKRKorean Light Civil Helicopter
    LHTECLight Helicopter Turbine Engine Company
    LiDARLight Distance and Ranging
    LOALetter of Offer and Acceptance
    LOILevel of Interoperability
    LoILetter of Intent
    LPVLocalizer Performance with Vertical Guidance
    LRIPLow Rate Initial Production
    LUHINIndian Light Utility Helicopter
    LUTLimited User Testing
    M2MMachine-To-Machine
    MaaSMobility as a Service
    MACMMultiple Award Contract for Modifications
    MAFFSMilitary Aerial Firefighting System
    MAWTSUSMarine Aviation Weapons and Tactics
    MCASUSMarine Corps Air Station
    MCFMaintenance Check Flight
    MCMMine CounterMeasures
    MDOAMilitary Designs Organisation Approval
    MEMSMicro Electro Mechanical Systems
    METARMeteorological Aerodrome Report
    MFDMultifunction Flight Display
    MFDSMultifunction Display System
    MFEDSModernized Flexible Engine Diagnostic System
    MGBMain Gear Boxes
    MGTOWMax Gross Take-Off Weight
    MGWMaximum Gross Weight
    MISMaintenance Information System
    MMMSMulti Missions Management System
    MMSMission Management System
    MOAMemorandum of Agreement
    MoUMemorandum of Understanding
    MPTMulti Purpose Terminal
    MROMaintenance, Repair and Overhaul
    MRTMaintenance Training Rig
    MSHCHMarenco SwissHelicopter
    MSRPManufacturer Suggested Retail Price
    MTOWMaximum Takeoff Weight
    MUM-TManned UnManned Teaming
    NAAMTAUSNational Accreditation Alliance of Medical Transport Applications
    NAFCAU National Aerial Firefighting Centre of Australia
    NAROUKNaval Aircraft Repair Organisation
    NASNaval Air Station
    NAVSUP WSSUSNaval Supply Systems Command Weapon Systems SupportUSN
    NCOICUSNon-Commissioned Officer in Charge
    NDLONONorwegian Defence Logistics Organisation
    NFACUSNational Full-Scale Aerodynamics Complex
    NGONon-Governmental Organisation
    NOTAMNotice to Airmen
    NSFUSNational Science Foundation
    NSOPNon-Scheduled Operator
    NSPANATO Support and Procurement AgencyNSPA
    NSWCUSNaval Surface Warfare Center
    NVISNight Vision Imaging Systems
    NZCAANZNew Zealand Civil Aviation Authority
    OASISOpen Architecture System Integration Symbology
    OCCAROrganization for Joint Armament Cooperation
    OCFAUSOrange County Fire Authority
    OCONUSUSOutside Continental United States
    ODMOn-Demand Mobility
    OEIOne Engine Inoperative
    OEMOriginal Equipment Manufacturer
    OGCOpen Geospatial Consortium
    OMPOperational Maintenance Program
    ONRUSOffice of Naval Research
    OPAOptionally Piloted Aircraft
    OPBHOptionally Piloted Black Hawk
    OPHOptionally Piloted Helicopter
    OPVOptionally Piloted Vehicle
    OSCEOrganization for Security and Co-operation in Europe
    PAXPassengers
    PBHPower By The Hour
    PBLPerformance Based Logistics
    PBNPerformance Based Navigation
    PCDSPersonnel Carrying Device System
    PDMProgrammed Depot Maintenance
    PDRPreliminary Design Review
    PDT&TPost-Delivery Test and Trials
    PFDPrimary Flight Display
    PFRPreliminary Flight Rating
    PMAParts Manufacturer Approval
    POAProduction Organisation Approval
    POBPeople / Personnel on board
    POHPilot Operating Handbook
    PPEPersonal Protective Equipment
    PSMProgram Support Manager
    PSPPremium Service Provider
    PTTSatellite Push-to-Talk
    RAARequired Assets Available
    RDARepair Design Approval
    RFIRequest for Information
    RFMSRotorcraft Flight Manual Supplement
    RFPRequest For Proposal
    RNAVRequired Area Navigation Performance
    RNPRequired Navigation Performance
    RTBReturn-To-Base
    RTOWRunway Takeoff Weight
    RTPReduce To Produce
    RUASRotorcraft Unmanned Air System
    RUAVRotary Wing Unmanned Aerial Vehicle
    RWRRadar Warning Receiver
    SARASikorsky Autonomy Research Aircraft
    SBASSatellite-Based Augmentation System
    SBIRUSSmall Business Innovation Research program/contract
    SDARSoftware Defined Airborne Radio
    SERESurvival, Evasion, Resistance and Escape
    SFOHSince Factory OverHaul
    SMDSmart Mission Display
    SMESmall and Medium-sized Enterprises
    SMEESubject Matter Expert Exchange
    SMOHSince Major OverHaul
    SMSSafety Management Systems
    SMWDCUSNaval Surface and Mine Warfighting Development Center
    SPIFRSingle Pilot Instrument Flight Rules
    SRTM Shuttle Radar Topography Mission
    STCSupplemental Type Certificate
    STOHSince Top OverHaul
    SVSSynthetic Vision System
    SWaPLow size, Weight and Power
    TAFTerminal Aerodrome (or Area) Forecast
    TAWSTerrain Awareness System
    TBOTime Before Overhaul
    TCAACATransport Canada Civil Aviation
    TCASTraffic Collision Avoidance System
    TCCACATransport Canada Civil Aviation
    TDPMTouch Down Positioning Marker
    TDTTransonic Dynamics Tunnel
    TFRTemporary Flight Restrictions
    TGBTail Gear Box
    TIAType Inspection Authorization
    TLOFTouch-Down and Lift-Off
    TLUHTRTurkish Light Utility Helicopter
    TRBTail Rotor Bearing
    TREType Rating Examiner
    TRIType Rating Instructor
    TRLTechnology Readiness Level
    TSOTechnical Standard Order
    TSOATechnical Standard Order Authorization
    TTAFTotal Time AirFrame
    TTPTactics, Techniques and Procedures
    TTSNTotal Time Since New
    TUASTactical Unmanned Aerial System
    UAMUrban Air Mobility
    UASUnmanned Air System
    UAVUnmanned Aerial Vehicle
    UHPOUSU.S. Army Utility Helicopters Project Office
    UNHASUnited Nations Humanitarian Air ServiceUN
    USAOTCUSUS Army Operational Test Command
    USASACUSUS Army Security Assistance Command
    USCENTCOMUSU.S. Central Command
    USHSTUSUnited States Helicopter Safety Team
    USLUnder-Slung Load
    USVUnmanned Surface Vessel
    UTMUnmanned Aircraft System Traffic Management
    VAUSVeterans Affairs
    VFRVisual Flight Rules
    ViDARVisual Detection and Ranging
    VIPTVirtual Interactive Procedural Trainer
    VMCVehicle Management Computer
    VMIVendor Managed Inventory
    VOCVolatile Organic Compounds
    VSATVery Small Aperture Terminal for Satellite Communication
    VTCValidation of Type Certification
    W/OWritten Off
    WAASWide Area Augmentation System
    WACSWireless Airborne Communication System
    WFPUNWorld Food Programme
    WFUWithdrawn from Use
    WMDWeapon of Mass Destruction
    WMSWeapons Management System
    WSPSWire Strike Protection System
    WTIUSWeapons and Tactics Instructor Course