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Abbreviation/

Acronym

Meaning

LAWRS    Limited Aviation Weather Reporting

Station

LDA  .   Localizer Type Directional Aid
LDA/PRM   Localizer Type Directional Aid/Precision

Runway Monitor

LGA  .   LaGuardia Airport
LIRL .   Low Intensity Runway Lights
LLWAS  .   Low Level Wind Shear Alert System
LLWAS NE  .  Low Level Wind Shear Alert System

Network Expansion

LLWAS

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RS  .  Low Level Wind Shear Alert System

Relocation/Sustainment

LNAV    Lateral Navigation
LOC  .   Localizer
LOP   .   Line

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of

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position

LORAN    Long Range Navigation System
LP  .   Localizer Performance
LPV   .   Localizer Performance with Vertical

Guidance

LUAW  .   Line Up and Wait
LZ  .   Landing Zone
MAHWP  .  Missed Approach Holding Waypoint
MAP  .   Missed Approach Point
MAWP  .   Missed Approach Waypoint
MDA     Minimum Descent Altitude
MEA  .   Minimum En Route Altitude
MEARTS  .  Micro En Route Automated Radar

Tracking System

METAR    Aviation Routine Weather Report
MGOW    Maximum Gross Operating Weight
MHz  .   Megahertz
MIRL    Medium Intensity Runway Lights
MM   .   Middle Marker
MOA     Military Operations Area
MOCA  .   Minimum Obstruction Clearance Altitude
MRA     Minimum Reception Altitude
MRB  .   Magnetic Reference Bearing
MSA  .   Minimum Safe Altitude
MSAW  .   Minimum Safe Altitude Warning
MSL  .   Mean Sea Level
MTI   .   Moving Target Indicator
MTOS    Mountain Obscuration
MTR  .   Military Training Route
MVA  .   Minimum Vectoring Altitude
MWA    Mountain Wave Activity
MWO    Meteorological Watch Office
NAS  .   National Airspace System
NASA   National Aeronautics and Space

Administration

Abbreviation/

Acronym

Meaning

NAVAID    Navigational Aid
NAVCEN  .  Coast Guard Navigation Center
NCWF  .   National Convective Weather Forecast
NDB  .   Nondirectional Radio Beacon
NEXRAD  .  Next Generation Weather Radar
NGA  .   National Geospatial

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Intelligence Agency

NM    Nautical Mile
NMAC  .   Near Midair Collision
NOAA  .   National Oceanic and Atmospheric

Administration

NOPAC     North Pacific
NoPT    No Procedure Turn Required
NPA  .   Nonprecision Approach
NRS  .   Navigation Reference System
NSA  .   National Security Area
NSW  .   No Significant Weather
NTSB    National Transportation Safety Board
NTZ  .   No Transgression Zone
NWS  .   National Weather Service
OAT  .   Outside Air Temperature
OBS  .   Omni

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bearing Selector

ODP  .   Obstacle Departure Procedure
OIS    Operational Information System
OIS    Obstacle Identification Surface
OM    Outer Marker
OOP  .   Operations Over People
ORD  .   Chicago O'Hare International Airport
P/CG .   Pilot/Controller Glossary
PA  .   Precision Approach
PAO  .   Public Aircraft Operation
PAPI  .   Precision Approach Path Indicator
PAR   .   Precision Approach Radar
PAR   .   Preferred Arrival Route
PC  .   Personal Computer
PDC  .   Pre

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departure Clearance

PFD   .   Personal Flotation Device
PIC    Pilot

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in

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Command

PinS  .   Point

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in

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Space

PIREP   Pilot Weather Report
POB  .   Persons on Board
POFZ    Precision Obstacle Free Zone
POI    Principal Operations Inspector
PPS    Precise Positioning Service
PRM  .   Precision Runway Monitor
PT  .   Procedure Turn
QICP    Qualified Internet Communications

Provider

Abbreviations/Acronyms

Appendix 3

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