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 

## M 

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 

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 

