Airbus Terms and Abbreviations (Selection)

V-Speeds

V-Speed	Term
V1	The highest speed during take-off that you can reject the take-off and still stop on the runway.
V2	Take-off safety speed, where if an engine fails, climb out and control is still guaranteed.
VA	Maximum design maneuvering speed, the maximum speed to do full control deflection in normal or alternate law.
VAPP	Speed for flying down the approach.
VF	Design Flap Speed
VFE	Maximum Flap Extended Speed.
VFEN	Predictive VFE at next flap/slat position
VFTO	Final Takeoff Speed
VLE	Maximum gear extension speed, often lower than the operating speed to prevent gear door damage.
VLO	Maximum gear operating speed, which means the max speed for the gear being down.
VLOF	Lift-off Speed
VLS	Lower Selectable Speed
VMAX	Airbus for the maximum speed for the current configuration, represented by black and red strip at the top of the airspeed indication.
VMCA	Minimum speed in the air that if one engine fails and the other is at TO thrust, you can still control the aircraft with the primary flight controls up to a bank of 5 degrees.
VMCG	Minimum speed on the ground that if one engine fails and the other is at TO thrust, you can still control the aircraft with the primary flight controls.
VMO	Maximum operating speed, also has MMO for maximum Mach number.
VR	Rotate speed, the point where you lift the nose off the runway.
VREF	Reference speed for a normal approach, what you aim to touchdown roughly at.
VS	Stalling Speed at which Airplane is Controllable
VS1	Stalling Speed or Minimum Steady Flight Speed obtained in a specified Configuration
VSO	Stalling Speed or Minimum Steady Flight Speed in the Landing configuration
VSW	Airbus for when the stall warning will activate, represented by a black and red strip at the bottom of the airspeed indicator, when there has been a failure to affect the flight control laws.
VX	Speed of Best Angle of Climb
VY	Speed for Best Rate of Climb
VαMAX	Airbus for the speed that the maximum angle of attack (AoA) can be without the aircraft stalling, shown by the top of a red strip at the bottom of the airspeed indicator.
VαPROT	Airbus for the speed that the angle of attack (AoA) protection will become active to stop the aircraft from stalling, shown as being the top of the black and amber strip at the bottom of the airspeed indicator.

Additional Speeds

V-Speed	Term
MMO	Maximum operating Mach number.
F	Minimum speed at which the flaps may be retracted at takeoff (i.e., CONF 2/3). Also the minimum speed in approach when in CONF 2 or 3
S	Minimum speed at which the slats may be retracted at takeoff. Also the minimum speed in approach when in CONF 1.
O	Green dot speed, engine-out operating speed with flaps up, best lift-to-drag ratio speed, also corresponds to final takeoff speed.

Abbreviations

Abbreviation	Term
A.ICE	Anti-ice, Anti-icing
A/BRK	Autobrake Aircraft
A/THR	Autothrust
ABV	Above
ACARS	Aircraft Communication Addressing and
ACAS	Airborne Collision Avoidance System
ACCEL	Acceleration/Accelerate
ACCU	Accumulator
ACFT	Aircraft
ACK	Acknowledge
ACP	Audio Control Panel
ACQ	Acquire
ACQN	Acquisition
ACT	Active
ADD	Addition, Additional
ADF	Automatic Direction Finder
ADIRS	Air Data/Inertial Reference System
ADIRU	Air Data/Inertial Reference Unit
ADR	Air Data Reference
ADS	Air Data System
ADV	Advisory
AESS	Aircraft Environment Surveillance System
AESU	Aircraft Environment Surveillance Unit
AEVC	Avionics Equipment Ventilation Computer
AFFIRM	Affirmative
AFIS	Airline In Flight Information System
AFM	Aircraft Flight Manual
AFS	Automatic Flight System
AFTR	After
AGL	Above Ground Level
AGS	Air Generation System
AGU	Air Generation Unit
AGW	Actual Gross Weight
AI	Anti-Icing
AIDS	Aircraft Integrated Data System
AIL	Aileron
AIRCOND	Air Conditioning
AIS	Audio Integrated System
AIS	Aeronautical Information Service
ALIGN	Alignment
ALLWD	Allowed
ALPHA	Angle-of-Attack
ALPHANUM	Alphanumerical
ALS	Approach Light System
ALT	Altitude
ALT ACQ	Altitude Acquire
ALT TO	Alternate To
ALTM	Altimeter
ALTN	Alternate, Alternative
AMB	Ambient
AMP	Ampere
ANN	Annunciator
ANN LT	Annunciator Light
AOA	Angle Of Attack
AOC	Airline Operational Control
AOG	Aircraft On Ground
AP	Autopilot
AP/FD	Autopilot/Flight Director
APPR	Approach
APPROX	Approximately
APU	Auxiliary Power Unit
APU AFE	APU Automatic Fire Extinguishing Control Unit
ARMD	Armed
ARMG	Arming
ARND	Around
ARPT	Airport
ARR	Arrival, Arriving
AS	Airspeed
ASD	Accelerate Stop Distance
ASI	Airspeed Indicator
ASP	Audio Selector Panel
ASSY	Assembly
ASYM	Asymmetric(al)
AT	Autothrottle / Autothrust
ATA	Actual Time of Arrival
ATC	Air Traffic Control
ATCI	Air Traffic Control and Information
ATCK	Attack
ATIS	Automatic Terminal Information Service
ATS	Autothrottle / Autothrust System
ATSU	Air Traffic Service Unit
ATT	Attitude
AUTOLAND	Automatic Landing
AVAIL	Available
AVAIL	Availability
AVG	Average
AVIONICS	Aviation Electronics
AVNCS	Avionics
AWY	Airway
B	Blue
B/C	Business Class
BARO	Barometric
BAT	Battery (Electrical)
BCF	Brake Cooling Fan
BCN	Beacon
BCS	Brake Control System
BCU	Brake Control Unit
BETW	Between
BEW	Basic Empty Weight
BKUP	Backup
BL	Bleed
BLK	Block
BLK	Black
BLW	Below
BM	Beam
BRDG	Bridge
BRG	Bearing
BRK	Brake
BRKNG	Braking
BRKR	Breaker
BRKS	Brakes
BRKT	Bracket
BRT	Bright, Brightness
BT	Bus Tie
BTL	Bottle
BTN	Button
BU	Battery Unit
BUS	Busbar
BYP	Bypass
C	Celsius, Centigrade
C/B	Circuit Breaker
C/L	Check List
C/M	Crew Member
CAB	Cabin
CAB PRESS	Cabin Pressurization
CAPT	Captain
CAS	Collision Avoidance System
CAT	Category
CAUT	Caution
CAUT LT	Caution Light
CFDS	Centralized Fault Display System
CHAS	Chassis
CHG	Change
CHK	Check
CHM	Chime
CIDS	Cabin Intercommunication Data System
CK	Check
CKD	Checked
CKPT	Cockpit
CL	Climb
CLB	Climb
CLG	Ceiling
CLK	Clock
CLR	Clear
CLR ALT	Clearance Altitude
CLRD	Cleared
CLRNC	Clearance
CLSD	Closed
CLSG	Closing
CM	Centimeters
CMD	Command
CNCT	Connect
CNCTD	Connected
CNTOR	Contactor
CNTR	Counter
CO	Company
CO RTE	Company Route
COM	Communication
COMP	Compass
COND	Condition
CONT	Continue, Continuous
COOL	Cooling
CORR	Correct
COUNT	Counter
CPT	Capture
CRG	Cargo
CRK	Crank
CRZ	Cruise
CSL	Console
CSTR	Constraint
CTK	Center Tank
CTL	Control
CTL	Central
CTLR	Controller
CU	Control Unit
CUR	Current
CW	Clockwise
CY	Cycle
DAC	Digital to Analog Converter
DADC	Digital Air Data Computer
DADS	Digital Air Data System
DAMP	Damping
DAU	Data Acquisition Unit
DB	Decibel
DB	Data Base
dB	Decibel
DB	Database
dB(A)	A-Weighted Decibel
DC	Direct Current
DCDU	Datalink Control and Display Unit
DCP	Display Control Panel
DECEL	Decelerate
DEG	Degree
DEGRADD	Degraded
DEL	Delete
DES	Descent
DEST	Destination
DET	Detection, Detector
DEV	Deviation
DFDAMU	Digital Flight Data Acquisition and Management Unit
DFDAU	Digital Flight Data Acquisition Unit
DFDR	Digital Flight Data Recorder
DFDRS	Digital Flight Data Recording System
DH	Decision Height
DI	Deicing
DIBU	Door Illumination Ballast Unit
DIFF	Differential
DIR	Direct, Direction, Director
DIR TO	Direct to
DISC	Disconnect, Disconnected
DISCH	Discharge, Discharged
DISCNTY	Discontinuity
DISRMD	Disarmed
DIST	Distance
DISTR	Distribute, Distribution, Distributor
DITCH	Ditching
DLK	Data Link
DLY	Delay
DMD	Demand
DME	Distance Measuring Equipment
DN	Down
DOW	Dry Operating Weight
DPI	Differential Pressure Indicator
DR	Door
DSPL	Display
E	East
EC	Engine Control
ECAM	Electronic Centralized Aircraft Monitoring
ECM	Engine Condition Monitoring
ECS	Environmental Control System
ECU	Electronic Control Unit
EE	Electrical and Electronic
EEC	Electronic Engine Control
EFCC	Electronic Flight Control Computer
EFCS	Electrical Flight Control System
EFCU	Electrical Flight Control Unit
EFIS	Electronic Flight Information System
ELAC	Elevator Aileron Computer
ELAPS	Elapsed Time
ELEC	Electric, Electrical, Electricity
ELEV	Elevator
ELS	Emergency Lighting System
ELT	Emergency Locator Transmitter
ELV	Elevation
EMER	Emergency
EMLS	Emergency Lighting System
ENG	Engine
ENG OUT	Engine Out
ENT	Entry
ENV	Envelope
EO	Engine Out
EO ACCEL ALT	Engine Out Acceleration Altitude
EPU	Emergency Power Unit
ERR	Error
ERS	Erase
ESC	Escape
ESD	Electronic System Display
EST	Estimated
ET	Elapsed Time
ETA	Estimated Time of Arrival
ETD	Estimated Time of Departure
ETE	Estimated Time En Route
ETO	Estimated Time Over
ETOPS	Extended Range Twin Engined Aircraft Operations
ETT	Estimated Time for Takeoff
EVAC	Evacuation
EWD	Engine/Warning Display
EWS	Electronic Warning System
EXT	Extend, Extension
F	Fuel
F	Fahrenheit
F	Minimum Flap Retract Speed (EFIS)
F/CTL	Flight Controls
F/O	First Officer
F/S	Fast/Slow
F/W	Failure Warning
FAA	Federal Aviation Administration
FAC	Flight Augmentation Computer
FACS	Flight Augmentation Computer System
FADEC	Full Authority Digital Engine Control
FAF	Final Approach Fix
FAIL	Failed, Failure
FAWP	Final Approach Waypoint
FBW	Fly-by-wire
FCC	Flight Control Computer
FCCS	Flight Control Computer System
FCCU	Flight Control Computer Unit
FCGU	Flight Control and Guidance Unit
FCMC	Fuel Control and Monitoring Computer
FCMS	Fuel Control Monitoring System
FCOM	Flight Crew Operating Manual
FCPC	Flight Control Primary Computer
FCPI	Flight Control Position Indicator
FCST	Forecast
FCTN	Function
FCU	Flight Control Unit
FD	Flight Director
FDR	Flight Data Recorder
FDU	Fire Detection Unit
FE	Flight Envelope
FEC	Flight Envelope Computer
FES	Fire Extinguishing System
FF	Fuel Flow
FG	Flight Guidance
FGES	Flight Guidance and Envelope System
FGS	Flight Guidance System
FL	Flight Level
FLDK	Flight Deck
FLEX	Flexible
FLP	Flap
FLT	Flight
FLT CTL	Flight Control
FM	Flight Management
FMA	Flight Mode Annunciator
FMC	Flight Management Computer
FMCS	Flight Management Computer System (FMC and CDU)
FMCU	Flight Management Computer Unit
FMGC	Flight Management and Guidance Computer
FMGEC	Flight Management Guidance and Envelope Computer
FMGES	Flight Management Guidance and Envelope System
FMGS	Flight Management and Guidance System
FMS	Flight Management System (FMCS and AFS sensors)
FNA	Final Approach
FNCP	Flight Navigation Control Panel
FNSG	Flight Navigation Symbol Generator
FOB	Fuel On Board
FPA	Flight Path Angle
FPL	Flight Plan
F-PLN	Flight Plan
FPM	Feet per Minute
FREQ	Frequency
ft	Feet, Foot
ft/mn	Feet per Minute
FTK	Fuel Tank
FU	Fuel Used
FUSLG	Fuselage
FWC	Flight Warning Computer
FWD	Forward
FWS	Flight Warning System
FWSD	Flight Warning and System Display
G	Green
g	Gram
G/S	Glide Slope
GA	Go-Around
GDNC	Guidance
GEN	Generator
GLS	GNSS Landing System
GMT	Greenwich Mean Time
GND	Ground
GNSS	Global Navigation Satellite System
GP	Glide Path
GPCU	Ground Power Control Unit
GPS	Global Positioning System
GPU	Ground Power Unit
GPWC	Ground Proximity Warning Computer
GPWS	Ground Proximity Warning System
GR	Gear
GS	Ground Speed
GSHLD	Glareshield
GW	Gross Weight
GYRO	Gyroscope
H	Hot (Electrical Point)
h	Hour
h	Height
H NAV	Horizontal Navigation
HCU	Hydraulic Control Unit
HDG	Heading
HDG/S	Heading Selected
HI	High
HLD	Hold
HOLD	Holding
HP	High Pressure
Hpa	Hecto Pascal
HPA	High Power Amplifier
HR	Hour
HRS	Hours
HSI	Horizontal Situation Indicator
HUD	Head Up Display
HYD	Hydraulic
HZ	Hertz
I/P	Intercept Point
IAF	Initial Approach Fix
IAS	Indicated Airspeed
ICAO	International Civil Aviation Organisation
IDENT	Identification, Identifier, Identify
IF	Initial Fix
IFR	Instrument Flight Rules
IGN	Ignition
ILS	Instrument Landing System (LOC and G/S)
IM	Inner Marker
IMU	Inertial Measurement Unit
in	Inch
IN	Inch
IN HG	Inches of Mercury
INA	Initial Approach
INB	Inbound
INBD	Inboard
INCR	Increase
INCR	Increment
IND	Indicator
INFO	Information
INHI	Inhibit
INHIB	Inhibit, Inhibited, Inhibition
INIT	Initial(ization)
INOP	Inoperative
INS	Inertial Navigation System
INST	Instrument
INTCP	Intercept
INTERCOM	Intercommunication
INV	Inverter
IPDU	Ice Protection Data Unit
IRS	Inertial Reference System
IRU	Inertial Reference Unit
ISA	Inertial Sensor Assembly
ISO	International Standardization Organisation
JEP	Jeppesen
kg	Kilogram
kg/m³	Kilograms/Cubic Meter
KHZ	Kilohertz
KIAS	Knots Indicated Airspeed
kPa	Kilo Pascal
KT	Knot(s)
KV	Kilo Volt
KVA	Kilovolt Ampere
kW	Kilowatt
L	Length
L	Litre or Liter
L	Left
L ECAM DU	Left ECAM Display Unit
L/D	Lift/Drag
L/G	Landing Gear
LAND	Landing
LAT	Lateral
LAT	Latitude
LAV	Lavatory
lb	Pound
LB	Pounds
lbf/in²	Pounds force per square inch
LB-FT	Pound - Force - Foot (Torque)
LB-IN	Pound - Inch
LCD	Liquid Crystal Display
LCH	Latch
LD	Load
LDG	Landing
LDG GR	Landing Gear
LED	Light Emitting Diode
LGERS	Landing Gear Extension and Retraction System
LGMS	Landing Gear Management System
LH	Left Hand
LIM	Limit, Limitation, Limiting, Limiter
LKD	Locked
LO	Low
LO PR	Low Pressure
LOC	Localizer
LP	Low Pressure
LP VALVE	Low Pressure Valve
LS	Landing System
LT	Light
LTD	Limited
LTG	Lighting
LTS	Lights
LVL	Level
LVL/CH	Level Change
LVR	Lever
LW	Landing Weight
LWR	Lower
M	Maneuvering Speed (EFIS)
M	Magenta
m	Meter
M	Mode
M	Mach Number
M	Mach
MA	Milli-Ampere
MAG	Magnetic
MAINT	Maintenance
MAN	Manual
MAX	Maximum
MAX CLB	Maximum Climb
MAX DES	Maximum Descent
MB	Millibars
mbar	Millibar
MCDU	Multipurpose Control & Display Unit
MCT	Maximum Continuous Thrust
MCU	Master Control Unit
MDA	Minimum Decision Altitude
MDA	Minimum Descent Altitude
MDH	Minimum Descent Height
MEA	Minimum En Route IFR Altitude
MED	Medium
MEM	Memory
MFD	Multifunction Display
MGT	Management
mile/h	Miles per Hour
MIN	Minimum
min	Minute
MIN FUEL	Minimum Fuel
MIN TIME	Minimum Time
MISC	Miscellaneous
ml	Milliliter
MLG	Main Landing Gear
MM	Middle Marker
mm	Millimeter
MMO	Mach Max Operating Speed
MMO	Maximum Operating Mach
Mn	Mach Number
MON	Monitor, Monitoring, Monitored
MRW	Maximum Ramp Weight
MSG	Message
MSTR	Master
MTO	Maximum Take-Off
MTOW	Maximum Design Takeoff Weight
MTR	Meter
MWARN	Master Warning
MWC	Master Warning Computer
MWP	Master Warning Panel
MWS	Master Warning System
MZFCG	Maximum Zero Fuel Center of Gravity
MZFW	Maximum Design Zero Fuel Weight
n	Load Factor
N	Newton
N	Normal
N	North
N/A	Not Applicable
N/P	Next Page
N/W	Nose Wheel
N/WS	Nose Wheel Steering
N1	Low Pressure Rotor Speed
N1	Engine Fan Speed
N1.D	N1 Descent
N2	High Pressure Rotor Speed
NAV	Navigation
NAVAID	Navigation Aid
ND	Navigation Display
NDB	Navigation Data Base
NDB	Non-Directional Radio Beacon
NDB	Non-Directional Beacon
NEG	Negative
NLG	Nose Landing Gear
NM	Nautical Mile
Nm	Moment (Newtonmeter)
NO	Normal Operation
No	Number
NORM	Normal
NOTAM	Notice to Airmen
NW	Nose Wheel
O	Open
O2	Oxygen (Symbol)
OAT	Outside Air Temperature
OEW	Operational Empty Weight
OFFR	Off/Reset
OFST	Offset
OK	Correct
OLW	Operational Landing Weight
OM	Outer Marker
OMS	Onboard Maintenance System
OMT	Onboard Maintenance Terminal
OP	Operational
OPP	Opposite
OPS	Operations
OPT	Optional
OPT	Optimum
OPTL	Optional
OPU	Overspeed Protection Unit
OTOW	Operational Take-Off Weight
OUT	Outlet
OUT	Output
OUTR	Outer
OVFL	Overflow
OVHD	Overhead
OVHT	Overheat
OVLD	Overload
OVPRESS	Overpressure
OVRD	Override
OVSP	Overspeed
OVSTEER	Oversteer
OVV	Overvoltage
OWE	Operating Weight Empty
OXY	Oxygen
OZ	Ounce
P	Pressure
P/B	Pushbutton
P/BSW	Pushbutton Switch
P/L	Payload
Pa	Pascal
PARK	Parking
PAS	Pitch Attitude Sensor
PAX	PAX Announcement Entertainment &
PAX	Passenger
Pb	Pressure Ambient
PCT	Percent
PCU	Power Control Unit
PED	Pedestal
PERF	Performance
PF	Pilot Flying
PFD	Primary Flight Display
PG	Page
phi	Bank Angle
phi N	Nominal Bank Angle
PHR	Pounds per Hour
PLT	Pilot
PMP	Pump
PMU	Power Management Unit
PNEU	Pneumatic
PNL	Panel
POS	Position
PPM	Parts per Million
PR	Pressure
PRB	Probe
PREV	Previous
PRGM	Program
PRI	Priority
PROC	Procedure
PROG	Progress
PSU	Power Supply Unit
PTR	Push to Reset
PTT	Push to Test
PTT	Push-to-Talk
PTU	Power Transfer Unit
PW	Pratt and Whitney
PWR	Power
QFE	Baro Pressure Setting for Airfield Altitude
QFE	Field Elevation Atmospheric Pressure
QFE	Pressure Setting for Airfield Altitude
QNE	Sea Level Standard Atmosphere Pressure
QNH	Baro Pressure Setting for en Route Altitude
QNH	Sea Level Atmospheric Pressure
QNH	Pressure Setting for En Route Altitude
QNH	Sea Level Pressure
R	Red
R	Radius
R	Release
R	Reset
R	Right
R/C	Rate of Climb
R/D	Rate of Descent
R/H	Radar Height
R/L	Reading Light
r/min	Revolutions per Minute
R/T	Receiver Transmitter Unit
R/T	Radio Transmit
RA	Resolution Advisory
RA	Radio Altimeter, Radio Altitude
RAD	Radio
RAT	Ram Air Turbine
RCDR	Recorder
RCLM	Runway Center Line Marking
RCLS	Runway Center Line Light System
RCVR	Receiver
RCVY	Recovery
RDY	Ready
RECOG	Recognition
REFLNG	Refueling
REFUEL	Refueling
RET	Retract
RET	Return
RETR	Retract
REV	Reverse
REV	Revise, Revision
RF	Radio Frequency
RMP	Radio Management Panel
RMU	Radio Management Unit
RNAV	Area Navigation
RNG	Range
RNI	Radio Navigation Indicator
RPLNT	Repellent
RPTG	Reporting
RQRD	Required
RR	Rolls Royce
RST	Reset
RSV	Reserve
RSVR	Reservoir
RTE	Route
RTG	Rating
RTN	Return
RTO	Rejected TakeOff
RTOLW	Runway Takeoff and Landing Weight
RTOW	Runway Takeoff Weight
RTR	Router
RTRSW	Rotary Switch
RTU	Radar Transceiver Unit
RUD	Rudder
RVR	Runway Visual Range
RVS	Reverse
RVSN	Reversion
RWY	Runway
S	South
S	Minimum Slat Retract Speed (EFIS)
s	Second
S/C S/D	Step Climb Step Descent
SAT	Static Air Temperature
SATCOM	Satellite Communication
SBL	Symbol
SC	Single Chime
SD	System Display
SEAL	Sealing
SEC	Spoiler Elevator Computer
SEC	Secondary
SEC	Secondary Computer
SEG	Segment
SEL	Select, Selected, Selector, Selection
SELCAL	Selective Calling System
SEQ	Sequence, Sequential
SER	Serial Number
SER	Serial
SGU	Symbol Generator Unit
SHT	Short
SI	Slip Indicator
SID	Standard Instrument Departure
SIG	Signal
SIM	Simulation
SL	Sea Level
SLT	Slat
SMK	Smoke
SNSR	Sensor
SPAD	Scratchpad
SPD	Speed
SPD/M	Speed-Mach
SPEC	Specification
SPLR	Spoiler
SPLY	Supply
SRS	Speed Reference System
STAB	Stabilizer
STAR	Standard Terminal Arrival Route
STARTG	Starting
STAT	Static
STBY	Standby
STDY	Steady
STRG	Steering
STRUCT	Structure
STS	Status
SURF	Surface
SVCE	Service
SW	Switch
SYS	System
T	True
T	Turn
T	Trim
T	Time
t	Tonne
T/C	Top of Climb
T/D	Top of Descent
T/R	Thrust Reverser
TA	Traffic Advisory
TACAN	Ultra-high Frequency Tactical Air Navigation Aid
TACH	Tachometer
TAS	True Airspeed
TAT	Total Air Temperature
TBC	To Be Confirmed
TBU	Time Base Unit
TBV	Transient Bleed Valve
TC	Takeoff Charts
TCAS	Traffic Alert and Collision Avoidance System
TEMP	Temperature
TGT	Target
THR	Thrust
THROT	Throttle
THS	Trimmable Horizontal Stabilizer
TK	Ground Track Angle
TK	Tank
TKE	Track Angle Error
TLA	Throttle Lever Angle
TMA	Terminal Control Area
TMR	Timer
TO	Takeoff
TO/APPR	Takeoff/Approach
TOD	Takeoff Distance
TOGA	Takeoff/Go Around
TOGW	Takeoff Gross Weight
TOR	Takeoff Run
TOT	Total
TOW	Takeoff Weight
TOW	Towing
TR	Thrust Reverser
TRANS	Transition
TRANSF	Transfer
TRGT	Target
TRIG	Trigger
TRK	Track
TRK	Track (angle)
TROPO	Tropopause
TRT	Turn Round Time
TRU	True
TST	Test
TT	Total Time
TURB	Turbine
TWR	Tower
TWY	Taxiway
TX	Transmission (TCAS to Transponder)
TYP	Typical
UHF	Ultra High Frequency
V	Volt, Voltage
V	Valve
V/L	VOR/LOC
V/L	VOR/Localizer
V/S V1 V1 V2	Vertical Speed
V2min	Critical Engine Failure Speed Decision Speed
VACU	Vacuum
VCTREND	Airspeed Tendency
VDF	Very High Frequency Direction Finding Station
VDR	VHF Data Radio
VEL	Velocity
VERT	Vertical
VFR	Visual Flight Rules
VHF	Very High Frequency
VHV	Very High Voltage
VIB	Vibration
VLF	Very Low Frequency
VOL	Volume
VOR	Very High Frequency Omnirange Station
VOR.D	VOR-DME
VORTAC	Visual Omni-Range Tactical Air Navigation
VSI	Vertical Speed Indicator
W	Weight
W	Watt
W	West
W/V	Wind Direction and Speed
WAI	Wing Anti-Ice
WARN	Warning
WB	Wide Body
WD	Warning Display
WDO	Window
WG	Wing
WHL	Wheel
WR	Weather Radar
WS	Wind Speed
WT	Weight
WX	Weather Mode (ND)
WXR	Weather Radar
X	Cross
X	Trans Crossbleed
X BLEED X FEED	Crossfeed
X LINE	Crossline
X VALVE	Cross Valve
XFR	Transfer
XING	Crossing
XPDR	Transponder
XPNDR	Transponder
X-TALK	Cross-talk
XWIND	Crosswind
Y	Yellow
Y/C	Economy Class
YCR	Economy Class-Rear
YE	Year
Z	Greenwich Mean Time
ZC	Zone Controller
ZFCG	Zero Fuel Center of Gravity
ZFW	Zero Fuel Weight
Zp	Pressure Altitude
Zpi	Indicated Pressure Altitude

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Last update: September 20, 2021