Let us learn about the abbrevations used in aviation, aerospace and aeronautical sector Part-2

I
Abbreviation Term
IAF Initial approach fix
IAP Instrument approach procedure
IAS Indicated airspeed
ICAO International Civil Aviation Organization
ICO Idle cut-off
IF Intermediate Approach Fix
IFR Instrument Flight Rules
ILS Instrument Landing System
IMC Instrument Meteorological Conditions
INS Inertial Navigation System
IRS Inertial Reference System
ISA International Standard Atmosphere
L
Abbreviation Term
LCN Load Classification Number
LCG Load Classification Group
LHO Live Human Organs
LLZ Localizer (ILS)
LNAV Lateral Navigation
LOFT Line Oriented Flight Training
LM Land and Marine
M
Abbreviation Term
MAC Mid-air collision
MAP Missed Approach Point
MATS Manual of Air Traffic Services
MDA/H Minimum Descent Altitude/Height
MEDEVAC Medical Evacuation
MEF Maximum Elevation Figure
MLS Microwave Landing System
MM Middle Marker
MOC Minimum Obstacle Clearance
MRO Maintenance Repair Overhaul
MP Manifoil Pressure
MSA Minimum Safe Altitude/Minimum Sector Altitude
MSL Mean Sea Level
MTOW Maximum Take-Off Weight
N
Abbreviation Term
NDB Non-Directional Beacon
O
Abbreviation Term
OCA Obstacle Clearance Altitude
OCH Obstacle Clearance Height
OM Outer Marker
OBE Overcome By Events
P
Abbreviation Term
PANS-OPS Procedures for Air Navigation Services – Aircraft Operations
PAPI Precision Approach Path Indicator
PAR Precision Approach Radar
PDG Procedure Design Gradient
PDAS Public Domain Aeronautical Software
PET Point of Equal Time
PFAF Precision Final Approach Fix
PSR Point of Safe Return
PSU Personal Service Unit
Q
Abbreviation Term
QFE the Q-code for: Atmospheric pressure at a/d elevation (or at THR)
QNH the Q-code for: Altimeter sub-scale setting to obtain elevation when on the ground, i.e. altitude above MSL
R
Abbreviation Term
RA Radio Altitude
RAS Rectified Air Speed
RDH Reference Datum Height for ILS
RNAV Area navigation
RSR En-route Surveillance Radar
RVR Runway Visual Range
RVSM Reduced Vertical Separation Minimum
RWY Runway
S
Abbreviation Term
SIGMET Significant Meteorological Advisory
SOC Start of Climb at Missed Approach
SID Standard Instrument Departure
SR Sunrise
SS Sunset
STAR Standard Terminal Arrival Route
T
Abbreviation Term
TAA Terminal Arrival Area
TACAN Tactical Air Navigation
TAM Total Airport Management
TAS True airspeed
TAR Terminal Approach Radar
TCA Terminal control area
TCAS Traffic Collision Avoidance System
TCH Threshold Crossing Height
TERPS Terminal Procedures
TFR Temporary Flight Restriction
THR Runway Threshold
TOD Top of Descent
TO/GA Take-off/go around
TORA Take-off Run Available
TOW Take-off weight
TOWS Take-off warning system
TP Turning Point at Missed Approach
TRA Temporary Reserved Airspace
TRACON Terminal Radar Approach Control
TTAF Total Time Air Frame
TTSN Total Time Since New
TTSO Total Time Since Overhaul
TWR Tower
TWY Taxiway
U
Abbreviation Term
UAV Unmanned Air Vehicle
UHF Ultra High Frequency
UIR Upper Information Region
UTC Universal Coordinated Time
V
Abbreviation Term
VASI Visual Approach Slope Indicator
VDP Visual Descent Point
VFR Visual flight rules
VHF Very High Frequency
VMC Visual meteorological conditions
VNAV Vertical Navigation
VOR VHF omnidirectional range
V speeds
Abbreviation Term
Va Maneuvering speed
Vfe Maximum flaps extended speed
Vle Maximum landing gear extension speed
Vlo Maximum landing gear operating speed
Vmo Maximum operating speed
Vne Never-exceed speed
Vno Normal operating speed limit
Vs stall speed
Vx Best angle of climb speed
Vy Best rate of climb speed
W
Abbreviation Term
WOFW Weight-off-Wheels, indicates aircraft is off ground since lift off
WONW Weight-on-Wheels, indicates aircraft is on ground since touch down
X
Abbreviation Term
XMIT Transmit
XPDR Transponder
XPNDR Transponder
Z
Abbreviation Term
Z Zulu Time (UTC)