# Acronym List

Acronym Meaning
ACAS Airborne Collision Avoidance System
ACOL Anti-collision light
ADC Air data computer
ADELT Automatic deployable Emergency Locator Transmitter
ADF Automatic direction finder
AEO All engines operating
AFCS Automatic Flight Control System
AGL Above ground level
AHRS Attitude Heading Reference System
ALT Altitude or Altitude hold
ALT.A Altitude acquire
AMC Aircraft Management Computer
APCP Autopilot control panel
A.TRIM Automatic trim system
ATT Attitude or Long term attitude hold
BAT Battery
BKUP Backup SAS
BOT Bottle
CRHT, CR.HT Cruise height
DA Decision Altitude
DEG, DEGR Degraded
DG Directional gyro
DH Decision height
DISCH Discharge
DISCON Disconnected
DMAP Digital Map System
DME Distance measuring equipment
DSAS Digital SAS
DST Distance
DTD Data Transfer Device
DTK Desired Track
EFB Electronic Flight Bag
ELT Emergency Locator Transmitter
EMER Emergency
EMS Emergency Medical Services
EPU External power unit
FADEC Full Authority Digital Engine Control
FDS Flight Display System
FLI First limit indicator
FMS Flight management system
FND Flight and Navigation Display
FPA Flight Path Angle
GA Go Around
GEN Generator
GPS Global positioning system
GS Ground speed
GTC Ground trajectory control
GTC.H Ground trajectory control with hover mode
GTN GARMIN GTN 750
HAT Height Above Terrain
HDG Heading
HEMS Helicopter Emergency Medical Services
HIGE Hover in ground effect
HISL High Intensity Search Light
HMD Helmet Mounted Display
HOGE Hover out of ground effect
HTAWS Helicopter Terrain Awareness and Warning System
IAS Indicated airspeed
IBF Inlet Barrier Filter
IESI Integrated Electronic Standby Instrument/Indicator
IMA Integrated Modular Avionics
LAVCS Light Helicopter Active Vibration Control System
LDG Landing (Landing Light)
LNAV Lateral Navigation approach (nonprecision)
LNAV+V Non–precision LNAV approach with vertical guidance
LNAV/VNAV Lateral Navigation and Vertical Navigation approach
LOC Localizer
LOW ALT Low altitude
LP Localizer Performance without vertical guidance
LP+V Localizer Performance with advisory vertical guidance
LPV Localizer Performance with vertical guidance
L/VNAV Lateral Navigation and Vertical Navigation approach
LSK Line select key
MFD Multifunction display
MGB Main gearbox
MISC Miscellaneous
MSG Message
MSTR Master
MTOW Maximum Takeoff weight
N1 Gas generator speed
N2 Power turbine speed
NAVD Navigation display
OAT Outside air temperature
OBS Omni Bearing Selector
OEI One engine inoperative
OGE Out of ground effect
OVHT Overheat
PAX Passenger
pb Push Button
QTY Quantity
RA Radar altitude
RNAV Area Navigation
SAS Stability augmentation system
SBAS Satellite Based Augmentation System
SEMA Smart electro-mechanical actuator
SL, S/L Search Light
SK Select Key or Soft Key
STBY Standby
SUSP Suspended
SVS Synthetic Vision System
SYS, SYST System
TAS True airspeed
TGB Tail gearbox
TOP Takeoff power
TOT Turbine outlet temperature
TRQ Torque
TRK Track
V.APP Vertical approach
VENT Ventilation
VMS Vehicle Management System
VNE Never-exceed speed
VNE power off Maximum speed in autorotation
VOR VHF omnidirectional radio ranging
VRS Vortex Ring State
VS Vertical speed
VTOSS Takeoff safety speed
VY Best rate-of-climb speed
XFER Fuel transfer pump