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A                    A-post,  A-pillar                   

A                    Amperes                             

A                    *Amper  *Ammeter  *Advance        

A.I.R.              Air Injection Reactor               

A.M.                Above-Mentioned                     

A/C                 Air Conditioning                    

A/C                 A/C Amplifie                        

A/C CLTCH.    A/C Clutch                  

A/CL               Air Cleaner                         

A/CL-BM         Air Cleaner Bimetal Sensor          

A/CL-CWM      Air Cleaner Cold Weather Modulator           

A/CL-DV         Air Cleaner Duct Valve Vacuum Motor 

A/CL-TSOV     Air Cleaner Temperature Sensor Override Valve       

A/CL-VCD       Air Cleaner Vacuum Control Delay  

A/CL-VCV       Air Cleaner Vacuum Control Valve  

A/CL-VM         Air Cleaner Vacuum Motor            

A/F                 Air-Fuel Ratio                      

A/T                 Automatic Transaxle Or Transmission

AA                  Automobile Association (UK)         

AAA                American Automobile Association     

AAC                Auxiliary Air Control               

AAC                Automatic Amplitude Control         

AACV              Auxiliary Air Control Valve         

AAD                Auxiliary Air Control Device        

AAE                America Association of Engineers    

AAMVM           American Association of Motor Vehicle Manufacturers 

AAP                Auxiliary Accelerator Pump          

AAP                Auxiliary Accelerating Pump         

AAP                Ambient Absolute Pressure           

AAS                Aspirator Air System                

AAS                Auto Adjust Suspension              

AAS                Air Adjust Screw                  

AAS                American Astronautical Society      

AAS                Air Adjust Screw                    

AASHTO         American Association of State Highways and Transportation Officials

AAV                Anti Afterburn Valve               

AB                  Air Bleed                           

ABA                Air Bleed Actuator                  

ABCV              Air Bleed Control Valve             

ABDC              After Bottom Dead Center           

ABG                Alcohol Blended Gasoline           

ABN                Airborne Noise                     

ABP                Air Brake Proportioing (valves)     

ABRS              Air Bag Restraint System           

ABS     	 	Altitude Barometric Switch         

ABS   		 Anti-Lock Brake System     

ABS  		 American Bureau of Standards       

Abs    		 Absolute                          

ABS Visc        	Absolute Viscosity          

ABSV    	 Air Bypass Solenoid Valve          

ABV	           *Anti Backfire Valve  *Air Bypass Valve  

ABV   		 Air Bypass Valve                    

ABV  	            	Anti-Backfire Valve                 

AC                  	Air Condition               

AC      		Alternating Current Generator       

AC      		*Alternating Current *After Contro  

AC      		AC Auxiliary Fan Relay              

AC      		AC Compressor Safety Switch         

AC      		AC Condenser Blower Motor Relay     

AC      		AC Control Unit                     

AC      		AC Diode                           

AC      		AC Evaporator Motor Relay          

AC      		AC Evaporator Pump Line Fuse       

AC      		AC High Pressure Safety Switch      

AC      		AC Idle Boost Valve                 

AC      		Alternating Current                 

AC      		Ante Christum                       

AC      		Accumulator                         

AC      		Acid                               

AC      		Analogue Computer                  

AC      		Automatic Control                   

AC      		Air-Cooled                          

AC      		Armored Car                         

AC      		Aerodynamic Center                  

AC      		Air Cooling                         

AC      		Air Cycle                           

AC      		Automatic Clutch                    

ACC     		A/C Clutch Compressor               

ACC     		Air Conditioning Clutch             

ACC     		Air Conditioning Clutch Switch      

ACC     		Automatic Climate Control          

ACC     		*Accessary *Altitude Compensation Carb                                

Accel   	Accelerator                         

ACCS    	A/C Clutch Cycling Switch           

ACCS    	Air Conditoning Cycling Switch      

Accum   	Accumulator                         

ACCWM   	Air Cleaner Cold Weather Modulator  

Accy    	Accessory                           

ACD     		Auxiliary Control Device            

ACD     		Air Conditioning Demand             

ACD     		Air Conditioning Demand Switch      

ACDV    	Air Cleaner Diverter Valve         

ACE     		Air Conditioning Equipment          

ACE     		Automatic Check Equipment           

ACE     		Automatic Computing Equipment      

ACE     		Air Conditioning Equipment          

ACG     		Alternating Current Generator       

ACG     		Automatic Control Gear              

ACIS    		Acoustic Control Iduction System    

Ack     		Acknowledge                         

ACKV    	Air Check Valve                     

ACL     		Air Clearner                        

ACL     		Automatic Chassis Lubrication       

ACM     	Advanced Composite Materials        

ACON    	Air Conditioning On                 

ACP     		Air Conditioning Pressure           

ACP     		Auxiliary Control Panel             

ACRS    	Air Cushion Restraint System        

ACS     		Air Conditioning System             

ACS-O   	Access Opening                      

ACT     		Air  Charge  Temperature            

ACT     		Air Charge Temperature Sensor       

ACTE    	Automatic Checkout Test Equipment   

Actu    		Actuator                            

Actv    		Active                       

ACV     		Air Control Valve                   

ACV     		Air Cut Valve                       

ACV     		Armored Command Vehicle           

ACV     		Air Control Valve                   

AD      		Anno Domini                         

AD      		Aerodynamic Decelerator             

ADC     		Analog-Digital Converter            

ADD     		Addition                           

ADECS   	Automotive Diesel Electronic Control System                      

ADF     		Aerodynamic Drag Factor            

Adj     		Adjust  or  Adjustable              

ADL     		Automatic Door Lock                 

ADP     		Air-Driven Hydraulic Pump           

ADS     		Adaptive Damper System              

ADV     		Advance

AE      		Acceleration Enrichment             

AE      		Acoustic Emission                   

AEA     		Automotive Electrical Association (US)                    

AEC     		Automotive Emission Control         

AECD    	Auxiliary Emission Control Device   

AEI     		After End of Injection              

AERA    	Automotive Engine Rebuilders Association (US)                    

AESC    	American Engineering Standards Committee                          

AETS    	Automatic Engine Test System        

AF      		Air-Fuel Ratio                     

AF      		Auxiliary Fuel                      

AFC     		Airflow Controlled                  

AFC     		Airflow Controlled Fuel Injection  

AFC     		Air Fuel Control                    

AFC     		Automatic Frequency Control         

AFC     		Airflow Control                     

AFCO    	Automatic Fuel Cutoff               

AFCV    	Air Fuel Ratio Control Valve        

AFE     		Automobile Fuel Economy             

AFER    	Air-Fuel Equivalence Ratio          

AFR     		Air-Fuel Ratio                      

AFS     		Airflow Sensor                      

AFS     		Auxiliary Fuel Supply System        

AG      		Air Guard                           

AGO     		Automotive Gas Oil                  

AGT     		Automotive Gas Turbines         

AGV     		Automatic Guided Vehicle           

AGVS    	Automatic Guided Vehicle System     

AH      		Amper Hour                          

AHFSS   	Air Conditionig / Heater Function Select Switch                      

AI      		Air Injection                       

AICV    		Air Injection Check Valve           

AID     		Air Injection Dual                  

AIR     		Air Injection Reaction              

AIR     		Air Injector Reactor                

AIR BPV 	Air Bypass Valve                    

AIR COND RLY    Air Conditioner Relay       

AIR COND SIG    Air Conditioner Singnal     

Air Sel 	Air Selector                        

AIR-CHV 	AIR Check Valve                      

AIR-DVLV      	AIR Diverter Valve          

AIR-IVV 	AIR Idle Vacuum Valve               

AIS     		Air Injection Single                

AIS     		Air Injection System                

AIS     		Automatic Idle Speed                

AIV     		Air Injection Valve                 

AIVV    		AIR Idle Vacuum Valve               

AKI     		Anti-Knock Index                    

AL      		Acceleration Level                  

ALC     		Automatic Level Control             

ALCL    	Assembly Line Communication Link    

ALDL    	Assembly Line Diagnostic Link       

ALDL    	Assembly Line Data Link            

Ali     		Alignment                           

Alm     		Alarm                               

ALR     		Automatic Locking Retractor         

ALR     		Automatic Length Adjusting and Locking Retractor                   

ALR     		Automatic Locking Retractor         

Alt     		Alternator or Altitude              

Alt     		Alternator                          

ALU     		Arithmetic and Logical Unit         

AM      		Amplitude Modulation                

Amb     	Ambient                             

AMC     	American Motors Corporation         

AMGV    	Air Management Valve                

Amm     	Ammeter                             

Amp     	Amplifier                           

Amp     	Ampere                              

AN      		Above-Named                         

AN      		Annual                              

AN      		Anode                               

ANC     		Active Noise Control System         

ANL     		Automatic Noise Limiter             

ANS     		Answer                              

ANSI    		American National Standards Institute

Ant     		Antenna                             

ANTBV   	Anti-Backfire Valve                 

Anti-Dsl        	Anti-Diesel                 

AO      		Air Operated                        

AOC     		Air Oil Cooler                      

AOC     		Automatic Overload Control          

AOD     		Automatic Overdrive                 

AOQ     		Average Outgoing Quality            

AOT     		Automatic Overdrive Transmission    

AP      		Air Pump                            

APC     		Automatic Phase Control             

APC     		Automatic Power Control             

APC     		Automatic Program Control           

APC     		Armored Personnel Carrier           

APC     		Automatic Performance Control       

APCV    	Air Pump Control Valve              

APDV    	Air Pump Diverter Valve             

API     		American Petrol Institude           

App     		Apparatus                           

App     		Appendix                            

App     		Approved by                         

Approx  	Approximation                       

Apr     		Apprentice                          

APRA    	Automotive Parts Rebuilders Association(US)                    

APREVLV 	Air Pump Relief Valve              

APU     		Auxiliary Power Unit               

AQ      		Aqua(Water)                        

AR      		Air Regulator                      

AR      		Axle Ratio                         

ARC     		Acceleration Signal               

ARQ     		Automatic Error Request Equipement 

ARV     		Armored Recovery Vehicle           

AS      		Airflow Sensor                     

AS      		American Standard                  

AS      		Air Suction                        

AS      		Automatic Synchronizer             

ASA     		American Standard(s) Association   

ASA     		Acoustical Society of America      

ASC     		Automatic Stability Control        

ASCD    	Auto Speed Control Device          

ASCPS   	Air Switch Canister Purge Solenoid 

ASCPT   	Air Switch Canister Purge Timer    

ASD     		Auto Shut Down                     

ASDM    	Air Bag System Diagnostic Module   

ASDV    	Air Switching Diverter Valve       

ASE     		Automatic Stabilization Equipment  

ASIS    		Abort Sensing and Implementation System 

ASIS    		American Society for Industrial Security

ASL     		Above Sea Level                         

Asm     		Assembly                                

ASME    	American Society of Mechanical Engineers

ASQC    	American Society for Quality Control    

ASRV    	Air Switching Relief Valve              

ASS     		Air Switching Solenoid             

ASS     		Air Suction System                 

Ass     		Assembly                           

Ass     		Assistant                          

Ass     		Association                        

Assy    		Assembly                           

ASTM    	American Society for Testing and Materials                         

ASV     		Air Switching Valve                

ASV     		Air Suction Valve                  

ASV     		Air Switching Valve                

ASVS    	Air Switching Vacuum Solenoid      

AT      		Acceptance Test                    

AT      		Air Temperature                    

AT      		Ampere Turn                        

AT      		Angle of Train                     

AT      		Automatic Transmission             

AT.     		Air Tight                          

At.     		Atmosphere                         

ATC     		Automatic Temperature Control      

ATC     		After Top Center                   

ATC     		Automatic Temperature Control      

ATC     		Automatic Timing Corrector         

ATDC    	After Top Dead Center              

ATF     		Automatic Transmission Fluid       

Atm     		Atmosphere                         

ATM     	Automatic Transmission             

ATM     	Actuator Test Modes                

ATO     		Automatic Train Operation          

ATS     		Air Temperature Sensor             

ATS     		Automatic Train Stopper            

ATT     		Attenuation                        

ATV     		Above the Throttle Valve           

ATX     		Automatic Transaxle                

AUTO    	Automatic                          

Aux     		Auxiliary                          

AV      		Air Valve                          

Avg     		Average                            

AVOM    	Analog Volt-Ohm Meter              

AVSV    	Air Vent Solenoid Valve            

AWD     	Air Warning Device                 

AWD     	All Wheel Drive                    

AWP     	Average Working Pressure           

AWP     	Awaiting Parts                    

AXOD    	Automatic Overdrive Transaxle     

AZS     		Automatic Zero Set