List of aviation, aerospace and aeronautical abbreviations
<SPAN class=mw-headline id=A>A</SPAN><TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>A/C</TD>
<TD>aircraft</TD></TR>
<TR>
<TD>ACAS</TD>
<TD>Airborne Collision Avoidance System</TD></TR>
<TR>
<TD>ACARS</TD>
<TD>Aircraft Communication and Addressing Reporting System</TD></TR>
<TR>
<TD>ACMS</TD>
<TD>Aircraft Condition Monitoring System</TD></TR>
<TR>
<TD>ACC</TD>
<TD>Active Clearance Control</TD></TR>
<TR>
<TD>AD</TD>
<TD>Airworthiness Directive</TD></TR>
<TR>
<TD>ADC</TD>
<TD>Air Data Computer</TD></TR>
<TR>
<TD>ADF</TD>
<TD>Automatic Direction Finder</TD></TR>
<TR>
<TD>ADI</TD>
<TD>Attitude Director lndicator</TD></TR>
<TR>
<TD>ADS</TD>
<TD>Automatic Dependent Surveillance</TD></TR>
<TR>
<TD>AFCS</TD>
<TD>Automatic Flight Control System</TD></TR>
<TR>
<TD>AFDS</TD>
<TD>Autopilot Flight Director System</TD></TR>
<TR>
<TD>AFS</TD>
<TD>Aeronautical Fixed Service</TD></TR>
<TR>
<TD>A/D</TD>
<TD>aerodrome</TD></TR>
<TR>
<TD>agl</TD>
<TD>Above ground level</TD></TR>
<TR>
<TD>AHRS</TD>
<TD>Attitude Heading Reference System</TD></TR>
<TR>
<TD>AIP</TD>
<TD>Aeronautical Information Publication</TD></TR>
<TR>
<TD>ALS</TD>
<TD>Approach Lighting System</TD></TR>
<TR>
<TD>AMSL</TD>
<TD>Above Mean Sea Level</TD></TR>
<TR>
<TD>ANSP</TD>
<TD>Air Navigation Service Provider</TD></TR>
<TR>
<TD>AOA</TD>
<TD>Angle of Attack</TD></TR>
<TR>
<TD>AOC</TD>
<TD>Air Operator's Certificate</TD></TR>
<TR>
<TD>AOM</TD>
<TD>Airport/Aerodrome Operating Minima</TD></TR>
<TR>
<TD>APU</TD>
<TD>Auxiliary Power Unit</TD></TR>
<TR>
<TD>A/P</TD>
<TD>airplane (USA), aeroplane (ICAO)</TD></TR>
<TR>
<TD>ARINC</TD>
<TD>Aeronautical Radio Inc.</TD></TR>
<TR>
<TD>ARTCC</TD>
<TD>Air Route Traffic Control Centers</TD></TR>
<TR>
<TD>ASDA</TD>
<TD>Association for Scientific Development of Air Traffic Management in Europe</TD></TR>
<TR>
<TD>ASAS</TD>
<TD>Airborne Separation Assurance System</TD></TR>
<TR>
<TD>ASI</TD>
<TD>Airspeed Indicator</TD></TR>
<TR>
<TD>asl</TD>
<TD>Above sea level</TD></TR>
<TR>
<TD>ASM</TD>
<TD>Airspace management</TD></TR>
<TR>
<TD>ATA</TD>
<TD>Air Traffic Association</TD></TR>
<TR>
<TD>ATC</TD>
<TD>Air Traffic Control</TD></TR>
<TR>
<TD>ATFM</TD>
<TD>Air Traffic Flow Management</TD></TR>
<TR>
<TD>ATIS</TD>
<TD>Automatic Terminal Information Service</TD></TR>
<TR>
<TD>ATM</TD>
<TD>Air Traffic Management</TD></TR>
<TR>
<TD>AT-One</TD>
<TD>Strategic Alliance between DLR and NLR on ATM research and development</TD></TR>
<TR>
<TD>ATPL</TD>
<TD>Airline Transport Pilot Licence</TD></TR>
<TR>
<TD>ATS</TD>
<TD>Air Traffic Services</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=B>B</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>BC</TD>
<TD>Back Course</TD></TR>
<TR>
<TD>BFH</TD>
<TD>Big F*cking Hammer</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=C>C</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>CAA</TD>
<TD>Civil Aviation Authority</TD></TR>
<TR>
<TD>CAS</TD>
<TD>Calibrated airspeed</TD></TR>
<TR>
<TD>CFIT</TD>
<TD>Controlled Flight Into Terrain</TD></TR>
<TR>
<TD>CG</TD>
<TD>Center of Gravity</TD></TR>
<TR>
<TD>CMV</TD>
<TD>Converted Meteorological Visibility</TD></TR>
<TR>
<TD>CPDLC</TD>
<TD>Controller Pilot Data Link Communications</TD></TR>
<TR>
<TD>CTAF</TD>
<TD>Common Traffic Advisory Frequency)</TD></TR>
<TR>
<TD>CVR</TD>
<TD>Cockpit Voice Recorder</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=D>D</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>DA/H</TD>
<TD>Decision Altitude / Height (rel. to THR) See Instrument Landing System</TD></TR>
<TR>
<TD>DER</TD>
<TD>Departure End of Runway</TD></TR>
<TR>
<TD>DG</TD>
<TD>Directional Gyro</TD></TR>
<TR>
<TD>DLR</TD>
<TD>German Aerospace Center / Deutsches Zentrum für Luft- und Raumfahrt e.V.</TD></TR>
<TR>
<TD>DME</TD>
<TD>Distance Measuring Equipment</TD></TR>
<TR>
<TD>DR</TD>
<TD>Dead reckoning</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=E>E</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>EAS</TD>
<TD>Equivalent airspeed</TD></TR>
<TR>
<TD>ECAM</TD>
<TD>Electronic Centralised Aircraft Monitor</TD></TR>
<TR>
<TD>ECET</TD>
<TD>End of civil evening twilight</TD></TR>
<TR>
<TD>EICAS</TD>
<TD>Engine Indicator and Crew Alert System</TD></TR>
<TR>
<TD>E-LSA</TD>
<TD>Experimental light-sport aircraft</TD></TR>
<TR>
<TD>ELT</TD>
<TD>Emergency Locator Transmitter</TD></TR>
<TR>
<TD>EPR</TD>
<TD>Engine Pressure Ratio</TD></TR>
<TR>
<TD>ESA</TD>
<TD>Emergency Safe Altitude</TD></TR>
<TR>
<TD>EFIS</TD>
<TD>Electronic Flight Instrument System</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=F>F</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>FADEC</TD>
<TD>Full Authority Digital Engine Control</TD></TR>
<TR>
<TD>FAF</TD>
<TD>Final Approach Fix</TD></TR>
<TR>
<TD>FANS</TD>
<TD>Future Air Navigation System</TD></TR>
<TR>
<TD>FAP</TD>
<TD>Final Approach Point</TD></TR>
<TR>
<TD>FEP</TD>
<TD>Final End Point</TD></TR>
<TR>
<TD>FDR</TD>
<TD>Flight Data Recorder (also known as black box)</TD></TR>
<TR>
<TD>FIR</TD>
<TD>Flight Information Region</TD></TR>
<TR>
<TD>FL</TD>
<TD>Flight Level</TD></TR>
<TR>
<TD>FMC</TD>
<TD>Flight Management Computer (same as FMS)</TD></TR>
<TR>
<TD>FMS</TD>
<TD>Flight Management System</TD></TR>
<TR>
<TD>FPL</TD>
<TD>Filed Flight Plan</TD></TR>
<TR>
<TD>FMC</TD>
<TD>Flight Management Computer</TD></TR>
<TR>
<TD>FSF</TD>
<TD>Flight Safety Foundation</TD></TR>
<TR>
<TD>FSS</TD>
<TD>Flight Service Station</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=G>G</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>GCA</TD>
<TD>Ground-controlled approach</TD></TR>
<TR>
<TD>GLOC</TD>
<TD>g-Induced Loss of Consciousness, where g is acceleration relevant to the acceleration caused by gravity</TD></TR>
<TR>
<TD>GND</TD>
<TD>Ground</TD></TR>
<TR>
<TD>GP</TD>
<TD>Glide Path</TD></TR>
<TR>
<TD>GPS</TD>
<TD>Global Positioning System</TD></TR>
<TR>
<TD>GPWS</TD>
<TD>Ground Proximity Warning System</TD></TR>
<TR>
<TD>EGPWS</TD>
<TD>Enhanced Ground Proximity Warning System</TD></TR>
<TR>
<TD>GA</TD>
<TD>Go-Around</TD></TR>
<TR>
<TD>GS</TD>
<TD>Glideslope</TD></TR>
<TR>
<TD>GSE</TD>
<TD>Ground Support Equipment</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=H>H</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>H</TD>
<TD>Heavy</TD></TR>
<TR>
<TD>HDG</TD>
<TD>Heading</TD></TR>
<TR>
<TD>HL</TD>
<TD>Height Loss</TD></TR>
<TR>
<TD>HPA</TD>
<TD>Human Powered Aircraft</TD></TR>
<TR>
<TD>HSI</TD>
<TD>Horizontal Situation Indicator</TD></TR>
<TR>
<TD>HUD</TD>
<TD>Head-up display</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=I>I</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>IAF</TD>
<TD>Initial approach fix</TD></TR>
<TR>
<TD>IAP</TD>
<TD>Instrument approach procedure</TD></TR>
<TR>
<TD>IAS</TD>
<TD>Indicated airspeed</TD></TR>
<TR>
<TD>ICAO</TD>
<TD>International Civil Aviation Organization</TD></TR>
<TR>
<TD>ICO</TD>
<TD>Idle cut-off</TD></TR>
<TR>
<TD>IF</TD>
<TD>Intermediate Approach Fix</TD></TR>
<TR>
<TD>IFR</TD>
<TD>Instrument Flight Rules</TD></TR>
<TR>
<TD>ILS</TD>
<TD>Instrument Landing System</TD></TR>
<TR>
<TD>IMC</TD>
<TD>Instrument Meteorological Conditions</TD></TR>
<TR>
<TD>INS</TD>
<TD>Inertial Navigation System</TD></TR>
<TR>
<TD>IRS</TD>
<TD>Inertial Reference System</TD></TR>
<TR>
<TD>ISA</TD>
<TD>International Standard Atmosphere</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=L>L</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>LCN</TD>
<TD>Load Classification Number</TD></TR>
<TR>
<TD>LCG</TD>
<TD>Load Classification Group</TD></TR>
<TR>
<TD>LHO</TD>
<TD>Live Human Organs</TD></TR>
<TR>
<TD>LLZ</TD>
<TD>Localizer (ILS)</TD></TR>
<TR>
<TD>LNAV</TD>
<TD>Lateral Navigation</TD></TR>
<TR>
<TD>LOFT</TD>
<TD>Line Oriented Flight Training</TD></TR>
<TR>
<TD>LM</TD>
<TD>Land and Marine</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=M>M</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>MAC</TD>
<TD>Mid-air collision</TD></TR>
<TR>
<TD>MAP</TD>
<TD>Missed Approach Point</TD></TR>
<TR>
<TD>MATS</TD>
<TD>Manual of Air Traffic Services</TD></TR>
<TR>
<TD>MDA/H</TD>
<TD>Minimum Descent Altitude/Height</TD></TR>
<TR>
<TD>MEDEVAC</TD>
<TD>Medical Evacuation</TD></TR>
<TR>
<TD>MEF</TD>
<TD>Maximum Elevation Figure</TD></TR>
<TR>
<TD>MLS</TD>
<TD>Microwave Landing System</TD></TR>
<TR>
<TD>MM</TD>
<TD>Middle Marker</TD></TR>
<TR>
<TD>MOC</TD>
<TD>Minimum Obstacle Clearance</TD></TR>
<TR>
<TD>MRO</TD>
<TD>Maintenance Repair Overhaul</TD></TR>
<TR>
<TD>MP</TD>
<TD>Manifoil Pressure</TD></TR>
<TR>
<TD>MSA</TD>
<TD>Minimum Safe Altitude/Minimum Sector Altitude</TD></TR>
<TR>
<TD>MSL</TD>
<TD>Mean Sea Level</TD></TR>
<TR>
<TD>MTOW</TD>
<TD>Maximum Take-Off Weight</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=N>N</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>NDB</TD>
<TD>Non-Directional Beacon</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=O>O</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>OCA/H</TD>
<TD>Obstacle Clearance Altitude/Height</TD></TR>
<TR>
<TD>OM</TD>
<TD>Outer Marker</TD></TR>
<TR>
<TD>OBE</TD>
<TD>Overcome By Events</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=P>P</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>PANS-OPS</TD>
<TD>Procedures for Air Navigation Services - Aircraft Operations</TD></TR>
<TR>
<TD>PAPI</TD>
<TD>Precision Approach Path Indicator</TD></TR>
<TR>
<TD>PAR</TD>
<TD>Precision Approach Radar</TD></TR>
<TR>
<TD>PDG</TD>
<TD>Procedure Design Gradient</TD></TR>
<TR>
<TD>PDAS</TD>
<TD>Public Domain Aeronautical Software</TD></TR>
<TR>
<TD>PET</TD>
<TD>Point of Equal Time</TD></TR>
<TR>
<TD>PFAF</TD>
<TD>Precision Final Approach Fix</TD></TR>
<TR>
<TD>PSR</TD>
<TD>Point of Safe Return</TD></TR>
<TR>
<TD>PSU</TD>
<TD>Personal Service Unit</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=Q>Q</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>QFE</TD>
<TD>the Q-code for: Atmospheric pressure at a/d elevation (or at THR)</TD></TR>
<TR>
<TD>QNH</TD>
<TD>the Q-code for: Altimeter sub-scale setting to obtain elevation when on the ground, ie altitude above MSL</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=R>R</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>RA</TD>
<TD>Radio Altitude</TD></TR>
<TR>
<TD>RAS</TD>
<TD>Rectified Air Speed</TD></TR>
<TR>
<TD>RDH</TD>
<TD>Reference Datum Height for ILS</TD></TR>
<TR>
<TD>RNAV</TD>
<TD>Area navigation</TD></TR>
<TR>
<TD>RSR</TD>
<TD>En-route Surveillance Radar</TD></TR>
<TR>
<TD>RVR</TD>
<TD>Runway Visual Range</TD></TR>
<TR>
<TD>RVSM</TD>
<TD>Reduced Vertical Separation Minimum</TD></TR>
<TR>
<TD>RWY</TD>
<TD>Runway</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=S>S</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>SIGMET</TD>
<TD>Significant Meteorological Advisory</TD></TR>
<TR>
<TD>SOC</TD>
<TD>Start of Climb at Missed Approach</TD></TR>
<TR>
<TD>SID</TD>
<TD>Standard Instrument Departure</TD></TR>
<TR>
<TD>SR</TD>
<TD>Sunrise</TD></TR>
<TR>
<TD>SS</TD>
<TD>Sunset</TD></TR>
<TR>
<TD>STAR</TD>
<TD>Standard Terminal Arrival Route</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=T>T</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>TAA</TD>
<TD>Terminal Arrival Area</TD></TR>
<TR>
<TD>TACAN</TD>
<TD>Tactical Air Navigation</TD></TR>
<TR>
<TD>TAM</TD>
<TD>Total Airport Management</TD></TR>
<TR>
<TD>TAS</TD>
<TD>True airspeed</TD></TR>
<TR>
<TD>TAR</TD>
<TD>Terminal Approach Radar</TD></TR>
<TR>
<TD>TCA</TD>
<TD>Terminal control area</TD></TR>
<TR>
<TD>TCAS</TD>
<TD>Traffic Collision Avoidance System</TD></TR>
<TR>
<TD>TCH</TD>
<TD>Threshold Crossing Height</TD></TR>
<TR>
<TD>TERPS</TD>
<TD>Terminal Procedures</TD></TR>
<TR>
<TD>TFR</TD>
<TD>Temporary Flight Restriction</TD></TR>
<TR>
<TD>THR</TD>
<TD>Runway Threshold</TD></TR>
<TR>
<TD>TOD</TD>
<TD>Top of Descent</TD></TR>
<TR>
<TD>TO/GA</TD>
<TD>Take-off/go around</TD></TR>
<TR>
<TD>TOW</TD>
<TD>Take-off weight</TD></TR>
<TR>
<TD>TOWS</TD>
<TD>Take-off warning system</TD></TR>
<TR>
<TD>TP</TD>
<TD>Turning Point at Missed Approach</TD></TR>
<TR>
<TD>TRA</TD>
<TD>Temporary Reserved Airspace</TD></TR>
<TR>
<TD>TRACON</TD>
<TD>Terminal Radar Approach Control</TD></TR>
<TR>
<TD>TWR</TD>
<TD>Tower</TD></TR>
<TR>
<TD>TWY</TD>
<TD>Taxiway</TD></TR>
<TR>
<TD>TTSN</TD>
<TD>Total Time Since New</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=U>U</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>UAV</TD>
<TD>Unmanned Air Vehicle</TD></TR>
<TR>
<TD>UHF</TD>
<TD>Ultra High Frequency</TD></TR>
<TR>
<TD>UIR</TD>
<TD>Upper Information Region</TD></TR>
<TR>
<TD>UTC</TD>
<TD>Universal Coordinated Time</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=V>V</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>VASI</TD>
<TD>Visual Approach Slope Indicator</TD></TR>
<TR>
<TD>VDP</TD>
<TD>Visual Descent Point</TD></TR>
<TR>
<TD>VFR</TD>
<TD>Visual flight rules</TD></TR>
<TR>
<TD>VHF</TD>
<TD>Very High Frequency</TD></TR>
<TR>
<TD>VMC</TD>
<TD>Visual meteorological conditions</TD></TR>
<TR>
<TD>VNAV</TD>
<TD>Vertical Navigation</TD></TR>
<TR>
<TD>VOR</TD>
<TD>VHF omnidirectional range</TD></TR></TBODY></TABLE>
<H3><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=V_speeds>V speeds</SPAN></H3>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>Vfe</TD>
<TD>Maximum flaps extended speed</TD></TR>
<TR>
<TD>Vle</TD>
<TD>Maximum landing gear extension speed</TD></TR>
<TR>
<TD>Vlo</TD>
<TD>Maximum landing gear operating speed</TD></TR>
<TR>
<TD>Vmo</TD>
<TD>Maximum operating speed</TD></TR>
<TR>
<TD>Vne</TD>
<TD>Never-exceed speed</TD></TR>
<TR>
<TD>Vno</TD>
<TD>Normal operating speed limit</TD></TR>
<TR>
<TD>Vs</TD>
<TD>stall speed</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=W>W</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>WOFW</TD>
<TD>Weight-off-Wheels, indicates aircraft is off ground since lift off</TD></TR>
<TR>
<TD>WONW</TD>
<TD>Weight-on-Wheels, indicates aircraft is on ground since touch down</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=X>X</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>XMIT</TD>
<TD>Transmit</TD></TR>
<TR>
<TD>XPDR</TD>
<TD>Transponder</TD></TR>
<TR>
<TD>XPNDR</TD>
<TD>Transponder</TD></TR></TBODY></TABLE>
<H2><SPAN class=editsection></SPAN> <SPAN class=mw-headline id=Z>Z</SPAN></H2>
<TABLE class=wikitable>
<TBODY>
<TR>
<TH>Abbreviation</TH>
<TH>Term</TH></TR>
<TR>
<TD>Z</TD>
<TD>Zulu Time (UTC)</TD></TR></TBODY></TABLE>
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