Abbreviation/
Acronym

Meaning

LLWAS NE .

Low Level Wind Shear Alert System
Network Expansion

LLWAS-RS .

Low Level Wind Shear Alert System
Relocation/Sustainment

LNAV
LOC .
LOP .
LORAN
LP .
LPV .

Lateral Navigation
Localizer
Line-of-position
Long Range Navigation System
Localizer Performance
Localizer Performance with Vertical
Guidance

LUAW .
LZ .

Line Up and Wait
Landing Zone

MAHWP .
MAP .
MAWP .
MDA
MEA .
MEARTS .

Missed Approach Holding Waypoint
Missed Approach Point
Missed Approach Waypoint
Minimum Descent Altitude
Minimum En Route Altitude
Micro En Route Automated Radar
Tracking System
Aviation Routine Weather Report
Megahertz
Medium Intensity Runway Lights
Middle Marker
Military Operations Area
Minimum Obstruction Clearance Altitude
Minimum Reception Altitude
Magnetic Reference Bearing
Minimum Safe Altitude
Minimum Safe Altitude Warning
Mean Sea Level
Moving Target Indicator
Mountain Obscuration
Military Training Route
Minimum Vectoring Altitude
Mountain Wave Activity
Meteorological Watch Office
National Airspace System
National Aeronautics and Space
Administration

METAR
MHz .
MIRL
MM .
MOA
MOCA .
MRA
MRB .
MSA .
MSAW .
MSL .
MTI .
MTOS
MTR .
MVA .
MWA
MWO
NAS .
NASA
NAVAID
NAVCEN .
NCWF .
NDB .
NEXRAD .
NFDC
NGA .
NM

Navigational Aid
Coast Guard Navigation Center
National Convective Weather Forecast
Nondirectional Radio Beacon
Next Generation Weather Radar
National Flight Data Center
National Geospatial-Intelligence Agency
Nautical Mile

Abbreviations/Acronyms

Abbreviation/
Acronym

Meaning

NMAC .
NOAA .

Near Midair Collision
National Oceanic and Atmospheric
Administration

NOPAC
NoPT
NOTAM
NPA .
NRS .
NSA .
NSW .
NTAP
NTSB
NTZ .
NWS .

North Pacific
No Procedure Turn Required
Notice to Airmen
Nonprecision Approach
Navigation Reference System
National Security Area
No Significant Weather
Notices to Airmen Publication
National Transportation Safety Board
No Transgression Zone
National Weather Service

OAT .
OBS .
ODP .
OIS
OIS
OM
ORD .

Outside Air Temperature
Omni-bearing Selector
Obstacle Departure Procedure
Operational Information System
Obstacle Identification Surface
Outer Marker
Chicago O"Hare International Airport

PA .
PAPI .
PAR .
PAR .
PC .
P/CG .
PDC .
PFD .
PinS .
PIREP
POB .
POFZ
POI
PPS
PRM .
PT .

Precision Approach
Precision Approach Path Indicator
Precision Approach Radar
Preferred Arrival Route
Personal Computer
Pilot/Controller Glossary
Pre-departure Clearance
Personal Flotation Device
Point-in-Space
Pilot Weather Report
Persons on Board
Precision Obstacle Free Zone
Principal Operations Inspector
Precise Positioning Service
Precision Runway Monitor
Procedure Turn

QICP

Qualified Internet Communications
Provider

RA
RAA .
RAIM
RAIS
RBDT
RCAG .
RCC .
RCLS

Resolution Advisory
Remote Advisory Airport
Receiver Autonomous Integrity Monitoring
Remote Airport Information Service
Ribbon Display Terminals
Remote Center Air/Ground
Rescue Coordination Center
Runway Centerline Lighting System

Appendix 3-3