A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

MMach number (followed by figures)
MMetres (preceded by figures)
MAAMaximum authorized altitude
MACCMilitary area control centre
MAGMagnetic
MAINTMaintenance
MAPAeronautical maps and charts
MAPPMilitary approach control unit
MAPTMissed approach point
MARMarch
MAXMaximum
MAYMay
MCAMinimum crossing altitude
MCTRMilitary control zone
MDAMinimum descent altitude
MDFMedium frequency direction − finding station
MDHMinimum descent height
MEAMinimum en−route altitude
MEHTMinimum eye height over threshold (for visual approach slope indicator system)
METMeteorological or meteorology
METARAerodrome routine meteorological report (in meteorological code)
METREPORTLocal routine meteorological report (in abbreviated plain language)
MFMedium frequency (300 to 3 000 kHz)
MHDFMedium and high frequency direction − finding stations (at the same location)
MHVDFMedium, high and very high frequency direction – fading stations (at the same location)
MHZMegahertz
MIDMid−point (related to RVR)
MIDMiddle and Far−East
MIFGShallow fog
MILMilitary
MINMinutes
MKRMarker radio beacon
MLSMicrowave landing system
MMMiddle marker
MNMMinimum
MNPSMinimum navigation performance specifications
MNTNMaintain
MOAMilitary operating area
MOCMinimum obstacle clearance (required)
MODModerate (used to indicate the intensity of weather phenomena, interference or static reports, e.g. MOD RA = moderate rain)
MONMonday
MOPSMinimum operational performance standards
MOTNEMeteorological Operational Telecommunications Network Europe
MOVMove or moving or movement
MPSMetres per second
MRAMinimum reception altitude
MRGMedium range
MRPATS/MET reporting point
MRVAMinimum radar vectoring altitude
MSMinus
MSAMinimum sector altitude
MSGMessage
MSLMean sea level
MTMAMilitary terminal control area
MTOMMaximum take−off mass
MTOWMaximum take−off weight
MTUMetric units
MTWMountain waves
MTWRMilitary aerodrome control tower
MVDFMedium and very high frequency direction – fading stations (at the same location)
MWOMeteorological watch office
MXMixed type of ice formation (white and clear)
(C) 2012-18 Jan Hrkal