4iR		Fourth Industrial Revolution
a/c		Aircraft
A2G		Air To Ground
AAD		Australian Antarctic Division
AAIB		Air Accidents Investigation Branch
AAM		Advanced Air Mobility
AAMS		Association of Air Medical Services
AAPB		Air Ambulance and Patient Billing
AATD		Advanced Aviation Training Device
AATD		US Army Aviation Applied Technology Directorate
ABACE		Asian Business Aviation Conference & Exhibition
ACLC		US Army Aviation Center Logistics Support Command
ACS		Aircraft Communications System
ACSF		Authorized Customer Service Facility
ACU		Aircraft Communication Unit
ADAHRS		Air Data and solid-state Attitude/Heading Reference System
ADC		Air Data Computer
ADI		Attitude Director Indicator
ADS-B		Automatic Dependent Surveillance Broadcast
AEDC		Arnold Engineering Development Center
AETC		Air Education and Training Command
AFB		Air Force Base
AFCS		Automatic Flight Control System
AFGSC		Air Force Global Strike Command
AFRL		Air Force Research Laboratory
AFSS		Aerial Fire Suppression Systems
AGW		Alternate Gross Weight
AHL		China Advanced Heavy Lift
AHMEC		American Helicopter Museum and Education Center
AHRS		Attitude and Heading Reference System
AHS		American Helicopter Society International
AHSAFA		American Helicopter Services & Aerial Firefighting Association
AI/ADI		Attitude Indicator
AIBN		Accident Investigation Board of Norway
AIRS		Airborne Image Recording System
AIS		Automatic Identification System
ALDS		Aerial Liquid Delivery System
ALE		Air Launched Effects
ALS		Airborne Locator Systems
AMC		Authorized Maintenance Center
AMCM		Airborne Mine CounterMeasures
AMCN		AirMedCare Network
AMCOM		US Army Aviation and Missile Command
AMLCD		Active-Matrix Liquid Crystal Display
AMNS		Airborne Mine Neutralization System
AMO		CBP Air and Marine Operations
AMROC		Authorized Maintenance Repair and Overhaul Center
AMSA		Australian Maritime Safety Authority
ANCC		American Nurses Credentialing Center
AoA		Analysis of Alternatives
AOC		Air Operator Certificate
AOG		Aircraft on Ground
AOR		Area Of Responsibility
APAR		Active Phased Array Radar
APAS		Advanced Pilot Assistance System
APU		Auxiliary Power Unit
ARA		Airborne Radar Approach
AShM		Anti-Ship Missile
ATC		Air Traffic Control
ATM		Air Traffic Management
ATO		Approved Training Organisations
ATOL		Automatic Take-Off and Landing
ATSB		Australian Transport Safety Bureau
ATTC		Aviation Technical Test Center
AUVSI		Association for Unmanned Vehicle Systems International	AUVSI
AVCATT		Aviation Combined Arms Tactical Trainer
AVDS		Airborne Video Downlink System
AVO		Air Vehicle Operator
AWP		Aerial Work Platform
AWR		Airworthiness Release
AWSAR		All Weather Search and REscue
B/U		Broken Up
B2B		Business to Business
BAAINBw		Federal Office of Bundeswehr Equipment, Information Technology and In-Service Support
BARS		Basic Aviation Risk Standard Program
BPS		Ballistic Protection System
BTCWFS		Ballistic Tolerant Crash-Worthy Fuel System
BVLOS		Beyond Visual Line of Sight
C-UAS		Counter-Unmanned Aerial System
C4IR		Command, Control, Communications, Computers, Intelligence, Surveillance and Reconnaissance
C4ISR		Command, Control, Computer, Communications, Intelligence, Surveillance and Reconnaissance
CAA		Civil Aviation Authority
CAAC		Civil Aviation Administration of China
CAANZ		Civil Aviation Authority of New Zealand
CAAS		Common Digital Avionics Architecture
CAMO		Continued Airworthiness Management Organisation
CAMTS		Commission on Accreditation of Medical Transport Systems	CAMTS
CASA		Civil Aviation Safety Authority
CASEVAC		Casualty evacuation
CASR		Civil Aviation Safety Regulations 1998
CBRN		Chemical, Biological, Radiological and Nuclear
CBT		Computer Based Training
CCAA		Cameroon Civil Aviation Authority
CCDC		US Army Combat Capabilities Development Command
CDI		Course Deviation Indicator
CDR		Critical Design Review
CFIT		Controlled Flight Into Terrain
CFTD		Containerized Flight Training Device
CGAS		Coast Guard Air Station
CMDS		Countermeasure Dispensing System
CMHP		Canadian Maritime Helicopter Project
CMLU		Cormorant Mid-Life Upgrade
CNATRA		Chief of Naval Air Training
COE		Center of Excellence
COMFRC		Commander, Fleet Readiness Centers
COMR		Civil Owned Military Registered
CONOPS		Concept of Operations
CONUS		Continental United States
COOP		Contingency Of Operations Plan
COTS		Commercial Off-The-Shelf
cPCDS		Complex Personnel Carrying Device System
CR&O		Component Repair and Overhaul
CRFS		Crash Resistant Fuel System
CRFT		Crash Resistant Fuel Tank
CSDP		Common Security and Defence Policy
CSF		Customer Service Facility
CTE		Culminating Training Exercise
CTF		Certified Training Facility
CTOL		Conventional Take-Off and Landing aircraft
CVFDR		Combination of Cockpit Voice Recorder and Flight Data Recorder
CVR		Cockpit Voice Recorder
CVS		Combined Vision System
DAGIR		Digital Air Ground Integration Range
DAR		Design Approval Representative
DARA		Defence Aviation Repair Agency
DCMA		Defense Contract Management Agency
DCR		Dynamic Component Repair
DFC		Development Flight Center
DFES		Department of Fire and Emergency Services
DGA		Direction Générale de l'Armement
DGAC		French Civil Aviation Authority
DIFFS		Deck Integrated Fire Fighting System
DLQ		Deck Landing Qualifications
DMC		Direct Maintenance Costs
DMF		Designated Maintenance Facility
DOA		Design Organization Approval
DOF		Designated Overhaul Facility
DRMO		Defense Reutilization and Marketing Office
DSCA		Defense Security Cooperation Agency
DSOR		Depot Source of Repair
DST		Defence Science and Technology
DVE		Degraded Visual Environment
DVES		Degraded Visual Environment System
EADI		Electronic Attitude Director Indicator
EASA		European Union Aviation Safety Agency	European Commission
EBACE		European Business Aviation Convention and Exhibition
EBIT		Earnings Before Interest and Taxes
EBITA		Earnings Before Interest, Taxes, and Amortization
EBITDA		Earnings before interest, taxes, depreciation, and amortization
EBS		Emergency Breathing System
EBS		Engine Backup System
EBT		Evidence based Training
ECTM		Engine Condition Trend Monitoring
eCTOL		Electrical Conventional Take-Off and Landing aircraft
EDA		European Defence Agency
EDA		Electronic Document Associate
EDA		Excess Defense Articles
EDCU		Engine Data Concentrator Unit
EDHM		Engine Diagnosis and Health Monitoring
EFAS		Expeditionary Fluid Analysis System
EFB		Electronic Flight Bag
EFI		Electronic Flight Instruments
EFIS		Electronic Flight Instrument System
EFS		Emergency Float System
EFVS		Enhanced Flight Vision Systems
EGNOS		European Geostationary Navigation Overlay Service
EGPWS		Enhanced Ground Proximity Warning System
EICAS		Engine Instruments and Crew Alert System
EIS		Engine Indication System
ELT		Emergency Locator Transmitter
EMA		Emergency Management Agency
EMAR		European Defence Agency's European Military Airworthiness Requirements
EMD		Electronic Miscellaneous Document
EMD		Engineering Manufacturing Development
EMEA		Europe, Middle East and Africa
EMFF		European Maritime and Fisheries Fund
EMS		Emergency Medical Service
EMS		Environmental Management System
EMSA		European Maritime Safety Agency	European Commission
EMT		Emergency Medical Technicians
ENG		Electronic News Gathering
EO/IR		Electro-Optical and Infrared
EOI		Expression of Interest
EOS		Emergency Oxygen System
EPA		Environmental Protection Agency
EPAF		European Participating Air Forces
EPAS		European Plan for Aviation Safety
ePCR		Electronic Patient Care Records
EPLB		Emergency Personal Locator Beacon
EPRC		European Personnel Recovery Center
EPSA		Enhanced Pilot Situational Awareness
ERDF		European Regional Development Fund
ERE		Emergency Response Exercise
ERFS		Extended Range Fuel System
ERO		Engine Repair and Overhaul
ERS		Employer Recognition Scheme
ESGR		Employer Support of the Guard and Reserve
ESI		Electronic Standby Instrument
ESMCP		Emergency Services Mobile Communications Programme
ESN		Emergency Services Network
ESSS		External Stores Support System
eSTOL		Electrical Short Take-Off and Landing aircraft
ETAC		European Tactical Airlift Center
EUTM		European Union Training Mission
EVS		Enhanced Vision System
eVTOL		Electrical Vertical Take-Off and Landing aircraft
EWIS		Electrical Wiring Interconnection System
FAA		Federal Aviation Administration	FAA
FACE		Future Airborne Capability Environment
FAI		Fédération Aéronautique Internationale
FAL		Final Assembly Line
FARP		Forward Armament and Refueling Point
FASGW		Future Anti-Surface Guided Weapon
FATO		Final Approach and Take-Off
FBO		Fixed Base Operator
FCAS		Flight Control Actuation System
FCOM		Flight Crew Operating Manual
FDI		Flight Director Indicator
FDM		Flight Data Monitoring
FDNF-E		Forward Deployed Naval Forces-Europe
FDR		Flight Data Recorder
FEDSIM		Federal Systems Integration and Management Center
FEMA		Federal Emergency Management Agency
FFP		Fixed-Frice Contract
FFS		Full Flight Simulator
FIPS		Full Ice Protection System
FMC		Full Mission Capable
FMP		Fleet Management Program
FMS		Foreign Military Sales
FMS		Flight Management System
FNPT		Flight and Navigation Procedures Trainer
FOCA		Federal Office of Civil Aviation
FOCF		Free Operating Cash Flow
FOD		Foreign Object Damage
FODR		Flight Operations Documents Repository
FOQA		Flight Operations and Quality Assurance
FOST		Flag Officer Sea Training
FPCDU		Flat Panel Control Display Unit
FRAMP		Fleet Replacement Aviation Maintenance Program (US Navy)
FRCE		Fleet Readiness Center East
FRCSE		Fleet Readiness Center Southeast
FRCSW		Fleet Readiness Center Southwest
FRIES		Fast Rope Insertion and Extraction System
FSL		Forward Stocking Location
FSR		Field Service Representatives
FST		Fleet Support Team
FTD		Flight Training Device
FVL MS		Future Vertical Lift Maritime Strike
GAMA		General Aviation Manufacturers Association
GBAS		Ground-Based Augmentation System
GCC		Gulf Cooperation Council
GLS		GBAS Landing System
GNSS		Global Navigation Satellite System
GPS		Global Positioning System
GPU		Ground Power Unit
GSA		Government Surplus Auctions
GTOW		Gross Takeoff Weight
HAAR		Helicopter Air-to-Air Refueling
HAATS		High-altitude Army National Guard Aviation Training Site
HAC		Helicopter Association of Canada
HADR		Humanitarian Assistance and Disaster Relief
HAPS		High Altitude Pseudo-Satellite
HARK		Helicopter Aerial Rescue Kit
HART		Helicopter Aquatic Rescue Teams
HATS		Helicopter Aircrew Training System
HATWS		Helicopter Terrain Avoidance and Warning System
HDI		Heading Indicator
HDTS		Helmet Display and Tracking System
HEC		Human External Cargo
HEMS		Helicopter for Emergency Medical Service
HESLO		Helicopter External Sling LOad
HETS		Human External Transport (class D external load)
HFDM		Helicopter Flight Data Monitoring
HHO		Helicopter Hoist Operator
HIFR		Helicopter In-Flight Refueling
HISL		High Intensity Strobe Light
HISS		Helicopter Icing Spray System
HMD		Helmet Mounted Display
HMI		Human Machine Interface
HMPT		Helicopter Marine Pilot Transfers
HMTS		Hoist Mission Training System
HMU		Hydromechanical Units
HPS		Harbor Pilot Shuttle
HSI		Horizontal Situation Indicator
HSVT		Helicopter Synthetic Vision Technology
HSVTOL		High Speed Vertical Takeoff and Landing
HTAWS		Helicopter Terrain Awareness and Warning System
HTAWS		Helicopter Terrain Awareness System
HTD		Helicopter Training Device
HUD		Head-Up Display
HUET		Helicopter Underwater Escape Training
HUMS		Health and Usage Monitoring System
HVBSS		Helicopter visit, board, search and seizure
HWD		Head Wearable Display
IAACCT		Illinois Association of Air and Critical Care Transport
IBF		Inlet Barrier Filter
ICRC		International Committee of the Red Cross
ICS		Intercom Systems
ICU		Intensive Care Unit
IDIQ		Indefinite Delivery / Indefinite Quantity
IFAK		Individualized First Aid Kit
IFR		Instrument Flight Rules
IGB		Intermediate Gear Box
IGW		Increased Gross Weight
IHST		International Helicopter Safety Team
IIMC		Inadvertent Instrument Meteorological Conditions
IMC		Instrument Meteorological Conditions
IMO		International Maritime Organization
IMRH		Indian Multi Role Helicopter
IOC		Intent of Cooperation
IOC		Initial Operational Capability
IOC		Initial Operational Clearance
IOGP		International Association of Oil & Gas Producers
IoT		Internet of Things
IOT&E		Initial Operational Test and Evaluation
IPP		Integration Pilot Program
IQSMS		Integrated Quality Safety Management System
IS-BAO		International Standard for Business Aircraft Operations
ISO		International Organization for Standardization
ISR		Intelligence, Surveillance and Reconnaissance
ISS		In-Service Support
ITEC		International Training and Education Conference
ITN		Invitation to Negotiate
IWS		Integrated Weapons System
JCAB		Japan Civil Aviation Bureau
JRTC		Joint Readiness Training Center
JUONS		Joint Urgent Operational Needs Statement
KPP		Key Performance Parameter
KUH		Korean Utility Helicopter
LAH		Korean Light Armed Helicopter
LCH		Korean Light Civil Helicopter
LCH		Indian Light Combat Helicopter
LHTEC		Light Helicopter Turbine Engine Company
LiDAR		Light Distance and Ranging
LOA		Letter of Approval
LOA		Letter of Offer and Acceptance
LOI		Level of Interoperability
LoI		Letter of Intent
LOR		Letter of Request
LPV		Localizer Performance with Vertical Guidance
LRIP		Low Rate Initial Production
LRU		Line Replaceable Unit
LTA		Long Term Agreement
LUC		Light UAS Operator Certificate
LUH		Indian Light Utility Helicopter
LUT		Limited User Testing
LWS		Laser Warning Sensor
M&E		Monitoring and Evaluation
M2M		Machine-To-Machine
MaaS		Mobility as a Service
MACM		Multiple Award Contract for Modifications
MAFFS		Military Aerial Firefighting System
MAWTS		Marine Aviation Weapons and Tactics
MCAS		Marine Corps Air Station
MCC		Multi-Crew Cooperation
MCF		Maintenance Check Flight
MCM		Mine CounterMeasures
MCP		Master Caution Panel
MCPTT		Mission Critical Push-To-Talk
MDE		Major Defense Equipment
MDOA		Military Designs Organisation Approval
MECCD		Army Medical Evacuation Concepts and Capability Division
MEDEVAC		Medical evacuation, also as MEDIVAC
MEMS		Micro Electro Mechanical Systems
METAR		Meteorological Aerodrome Report
METL		Mission Essential Task List
MFD		Multifunction Flight Display
MFDS		Multifunction Display System
MFEDS		Modernized Flexible Engine Diagnostic System
MGB		Main Gear Boxes
MGTOW		Max Gross Take-Off Weight
MGW		Maximum Gross Weight
MIS		Maintenance Information System
MMMS		Multi Missions Management System
MMRO		Manufacturing, Maintenance, Repair and Overhaul
MMS		Mission Management System
MOA		Memorandum of Agreement
MOS		Military Occupational Specialties
MOSA		Modular Open Systems Approach
MoU		Memorandum of Understanding
MPT		Multi Purpose Terminal
MRO		Maintenance, Repair and Overhaul
MRT		Maintenance Training Rig
MSH		Marenco SwissHelicopter
MSRP		Manufacturer Suggested Retail Price
MTC		Major Trauma Centre
MTOW		Maximum Takeoff Weight
MUM-T		Manned UnManned Teaming
MWS		Missile Warning Sensor
NAAMTA		National Accreditation Alliance of Medical Transport Applications
NAFC		National Aerial Firefighting Centre of Australia
NARO		Naval Aircraft Repair Organisation
NAS		Naval Air Station
NAVSUP WSS		Naval Supply Systems Command Weapon Systems Support	USN
NCOIC		Non-Commissioned Officer in Charge
NDLO		Norwegian Defence Logistics Organisation
NFAC		National Full-Scale Aerodynamics Complex
NGO		Non-Governmental Organisation
NOTAM		Notice to Airmen
NSF		National Science Foundation
NSOP		Non-Scheduled Operator
NSPA		NATO Support and Procurement Agency	NSPA
NSSA		National Service of Sanitary Aviation
NSWC		Naval Surface Warfare Center
NVIS		Night Vision Imaging System
NZCAA		New Zealand Civil Aviation Authority
OASIS		Open Architecture System Integration Symbology
OCCAR		Organization for Joint Armament Cooperation
OCFA		Orange County Fire Authority
OCONUS		Outside Continental United States
OCTC		Orchard Combat Training Center
ODA		Organization Designation Authorization
ODM		On-Demand Mobility
OEI		One Engine Inoperative
OEM		Original Equipment Manufacturer
OGC		Open Geospatial Consortium
OMP		Operational Maintenance Program
ONR		Office of Naval Research
OPA		Optionally Piloted Aircraft
OPBH		Optionally Piloted Black Hawk
OPH		Optionally Piloted Helicopter
OPLS		Obstacle Proximity LIDAR System
OPV		Offshore Patrol Vessel
OPV		Optionally Piloted Vehicle
OSAC		Organisme pour la S�curit� de l'Aviation
OSCE		Organization for Security and Co-operation in Europe
PAX		Passengers
PBH		Power By The Hour
PBH		Parts by the Hour
PBL		Performance Based Logistics
PBN		Performance Based Navigation
PCDS		Personnel Carrying Device System
PDM		Programmed Depot Maintenance
PDR		Preliminary Design Review
PDT&T		Post-Delivery Test and Trials
PEO		Program Executive Office
PFD		Primary Flight Display
PFR		Preliminary Flight Rating
PMA		Parts Manufacturer Approval
PMI		Planned/periodic Maintenance Interval
PMO		Project Management Office
PNG		Polycon Next Generation
POA		Production Organisation Approval
POB		People / Personnel on board
POH		Pilot Operating Handbook
PPE		Personal Protective Equipment
PSM		Program Support Manager
PSP		Premium Service Provider
PTT		Satellite Push-to-Talk
RAA		Required Assets Available
RBH		Repair by the Hour
RDA		Repair Design Approval
RFI		Request for Information
RFM		Rotorcraft Flight Manual
RFMS		Rotorcraft Flight Manual Supplement
RFP		Request For Proposal
RNAV		Required Area Navigation Performance
RNP		Required Navigation Performance
RPAS		Remotely-Piloted Aircraft System
RSAS		Rotor Strike Alerting System
RTB		Return-To-Base
RTOW		Runway Takeoff Weight
RTP		Reduce To Produce
RUAS		Rotorcraft Unmanned Air System
RUAV		Rotary Wing Unmanned Aerial Vehicle
RWR		Radar Warning Receiver
RWUAS		Rotary Wing Unmanned Air System
SaaS		Software as a service
SAF		Sustainable Aviation Fuel
SARA		Sikorsky Autonomy Research Aircraft
SBAS		Satellite-Based Augmentation System
SBIR		Small Business Innovation Research program/contract
SDAR		Software Defined Airborne Radio
SERE		Survival, Evasion, Resistance and Escape
SFOH		Since Factory OverHaul
SMD		Smart Mission Display
SME		Significant Military Equipment
SME		Small and Medium-sized Enterprises
SMEE		Subject Matter Expert Exchange
SMOH		Since Major OverHaul
SMS		Safety Management Systems
SMSPO		light Standards Safety Management System Program Office	FAA
SMSVP		Safety Management System Voluntary Program	FAA
SMWDC		Naval Surface and Mine Warfighting Development Center
SOSA		Sensor Open Systems Architecture
SPIFR		Single Pilot Instrument Flight Rules
SRTM		Shuttle Radar Topography Mission
SSS		System/Subsystem Specification
STC		Supplemental Type Certificate
STOH		Since Top OverHaul
STT		Small Tactical Terminal
SUAS		Small Unmanned Aerial Systems
SVS		Synthetic Vision System
SWaP		Low size, Weight and Power
TAF		Terminal Aerodrome (or Area) Forecast
TAWS		Terrain Awareness System
TBO		Time Before Overhaul
TCAA		Transport Canada Civil Aviation
TCAS		Traffic Collision Avoidance System
TCCA		Transport Canada Civil Aviation
TCCC		Tactical Combat Casualty Care
TCDL		Tactical Common Datalink
TDPM		Touch Down Positioning Marker
TDT		Transonic Dynamics Tunnel
TFPS		Transportable Flight Proficiency Simulator
TFR		Temporary Flight Restrictions
TGB		Tail Gear Box
TIA		Type Inspection Authorization
TLOF		Touch-Down and Lift-Off
TLUH		Turkish Light Utility Helicopter
TRB		Tail Rotor Bearing
TRE		Type Rating Examiner
TRI		Type Rating Instructor
TRL		Technology Readiness Level
TSO		Technical Standard Order
TSOA		Technical Standard Order Authorization
TTAF		Total Time AirFrame
TTP		Tactics, Techniques and Procedures
TTSN		Total Time Since New
TUAS		Tactical Unmanned Aerial System
UAM		Urban Air Mobility
UAS		Unmanned Air System
UAV		Unmanned Aerial Vehicle
UGV		Unmanned Ground Vehicle
UHPO		U.S. Army Utility Helicopters Project Office
UIPE		Uniform Integrated Protective Ensemble
UKCS		UK Continental Shelf
UNHAS		United Nations Humanitarian Air Service	UNHAS
USAOTC		US Army Operational Test Command
USASAC		US Army Security Assistance Command
USCENTCOM		U.S. Central Command
USHST		United States Helicopter Safety Team
USL		Under-Slung Load
USM		Used Serviceable Material
USV		Unmanned Surface Vessel
UTM		Unmanned Aircraft System Traffic Management
VA		Veterans Affairs
VFR		Visual Flight Rules
ViDAR		Visual Detection and Ranging
VIPT		Virtual Interactive Procedural Trainer
VMC		Vehicle Management Computer
VMI		Vendor Managed Inventory
VOC		Volatile Organic Compounds
VSAT		Very Small Aperture Terminal for Satellite Communication
VTB		Virtual Terrain Board
VTC		Validation of Type Certification
W/O		Written Off
WAAS		Wide Area Augmentation System
WACS		Wireless Airborne Communication System
WFP		World Food Programme
WFU		Withdrawn from Use
WICS		Wireless Intercommunication System
WMD		Weapon of Mass Destruction
WMS		Weapons Management System
WSPS		Wire Strike Protection System
WTD81		Bundeswehr Technical Center for Information Technology and Electronics
WTI		Weapons and Tactics Instructor Course