M  LC —local control  LCF —local control facility  LCN —local communications network  LCTD —located  LDA —localizer-type directional aid; landing directional aid  LDG —landing  LDIN —lead-in lights  LEC —local exchange carrier  LF —low frequency  LGT —light or lighting  LGTD —lighted  LINCS —leased interfacility NAS C  LIRL —low intensity runway lights  LIS —logistics and inventory system  LLWAS —low level wind shear alert system  LLZ —localizer  LM —compass locator at ILS middle marker  LM/MS —low/medium frequency  LMM —locator middle marker  LO —compass locator at ILS outer marker  LOC —local; locally; location; localizer  LOCID —location identifier  LOI —letter of intent  LOM —compass locator at outer marker  LONG —longitude  LPV —lateral precision performance with vertical guidance  LRCO —limited remote communications outlet  LRNAV —long range navigation  LRR —long range radar  LSR —loose snow on runway(s)  LT —left turn  MED —medium  METI —meteorological information  MF —middle frequency  MFJ —modified final judgment  MFT —meter fix crossing time/slot time  MHA —minimum holding altitude  Mhg —Meghertz  MIA —minimum IFR altitudes  MIDO —Manufacturing Inspection District Office  MIN —minute  MIRL —medium intensity runway lights  MIS —Meteorological Impact Statement  MISC —miscellaneous  MISO —Manufacturing Inspection Satellite Office  MIT —miles in trail  MITRE —Mitre Corporation  MLS —microwave landing system  MM —middle marker  MMAC —Mike Monroney Aeronautical Center  MMC —maintenance monitoring console  MMS —maintenance monitoring system  MNM —minimum  MNPS —minimum navigation performance specification  MNPSA —minimum navigation performance specifications  airspace  MNT —monitor; monitoring; monitored  MOA —memorandum of agreement; military operations area  MOC —minimum obstruction clearance  MOCA —minimum obstruction clearance altitude  MODE C —altitude-encoded beacon reply; altitude reporting  mode of secondary radar  MODE S —mode select beacon system  MON —Monday  MOU —memorandum of understanding  MPO —Metropolitan Planning Organization  MPS —maintenance processor subsystem or master plan  supplement  MRA —minimum reception altitude  MRC —monthly recurring charge  MSA —minimum safe altitude; minimum sector altitude  MSAW —minimum safe altitude warning  MSG —message  MSL —mean sea level  MSN —message switching network  MTCS —modular terminal communications system  MTI —moving target indicator  MU —mu meters  MUD —mud  MUNI —municipal  MUX —multiplexor  MVA —minimum vectoring altitude  MVFR —marginal visual flight rules  MAA —maximum authorized altitude  MAG —magnetic  MAINT —maintain, maintenance  MALS —medium intensity approach light system  MALSF —medium intensity approach light system with  sequenced flashers  MALSR —medium intensity approach light system with  runway alignment indicator lights  MAP —maintenance automation program; military airport  program; missed approach point; modified access pricing  MAPT —missed approach point  Mbps —megabits per second  MCA —minimum crossing altitude  MCAS —Marine Corps air station  MCC —maintenance control center  MCL —middle compass locater  MCS —maintenance and control system  MDA —minimum descent altitude  MDT —maintenance data terminal  MEA —minimum en route altitude  B-7 