MCT MAXIMUM CONTINUOUS THRUST
MCU MODULAR CONCEPT UNIT
MDA MINIMUM DECISION ALTITUDE
MDA MINIMUM DESCENT ALTITUDE
MDDU MULTIPURPOSE DISK DRIVE UNIT
MDH MINIMUM DECISION HEIGHT
MEC MAIN ENGINE CONTROL
MECH MECHANIC
MED MEDIUM
MEL MINIMUM EQUIPMENT LIST
MES MAIN ENGINE START
MF MEDIUM FREQUENCY
MFA MEMORIZED FAULT ANNUNCIATOR
MH MAGNETIC HEADING
MI MAGNETIC INDICATOR
MIC MICROPHONE
MID MIDDLE
MIL MILITARY INVENTORY (STANDARD) LIST
MIN ALT MINIMUM ALTITUDE
MIN FUEL MINIMUM FUEL
MIN TIME MINIMUM TIME
MIN MINIMUM
MISC MISCELLANEOUS
MKR MARKER (RADIO) BEACON
MLA MANEUVER LOAD ALLEVIATION
MLCV MANIFOLD LEAKAGE CONTROL VALVE
MLG MAIN LANDING GEAR
MLI MAGNETIC LEVEL INDICATOR
MLS MICROWAVE LANDING SYSTEM
MLW MAXIMUM LANDING WEIGHT
MM (AIRCRAFT) MAINTENANCE MANUAL
MM MIDDLE MARKER
MMEL MASTER MINIMUM EQUIPMENT LIST
MMH MAINTENANCE MANHOUR PER OPERATING HOUR
MMI MANUAL MAGNETIC INDICATOR
MMO MAXIMUM OPERATING MACH
MN MACH NUMBER
MN MINUTE
MNF MONITOR FAILURE
MOD MODIFICATION
MODE - S MODE SELECT
MODE A TRANSPONDER MODE A: 4 DIGITS OCTAL CODE TRANSMISSION
MODE B TRANSPONDER MODE B
MODE C TRANSPONDER MODE C: ALTITUDE REPORTING
MODE D TRANSPONDER MODE D
MODE S TRANSPONDER MODE S: SELECTIVE, NECESSARY FOR TCAS
MON MONITOR, MONITORED, MONITORING
MONG MONITORING
MOP MAIN OIL PRESSURE
MOP MAXIMUM OIL PRESSURE
MOP MINIMUM OIL PRESSURE
MOT MOTOR
MOT MOTOR OIL TEMPERATURE
MP MAINTENANCE PRACTICE, MAINTENANCE PROCEDURE
MPD MAINTENANCE PLANNING DOCUMENT
MPDS MAINTENANCE PLANNING DATA SUPPORT
MRB MAINTENANCE REVIEW BOARD
MRBD MAINTENANCE REVIEW BOARD DOCUMENT
MRDS MAINTENANCE AND RECORDING DATA SYSTEM
MRIU MAINTENANCE AND RECORDING INTERFACE UNIT
36 Aircraft Systems - Abbreviations and Acronyms

MS MILITARY SPECIFICATION, MILITARY STANDARD
MSA MINIMUM SAFE ALTITUDE
MSB MOST SIGNIFICANT BIT (BYTE)
MSDS MATERIAL SAFETY DATA SHEET
MSG MESSAGE
MSL MEAN SEA LEVEL
MSN MANUFACTURER SERIAL NUMBER
MSTR MASTER
MSU MODE SELECTOR UNIT (IRS)
MTBF MEAN TIME BETWEEN FAILURES
MTBR MEAN TIME BETWEEN REMOVALS
MTBUR MEAN TIME BETWEEN UNSCHEDULED REMOVAL
MTG MOUNTING
MTI MOVING TARGET INDICATOR
MTI MULTI TANK INDICATOR
MTOGW MAXIMUM TAKE OFF GROSS WEIGHT
MTOP MAINTENANCE TASK OPERATING PLAN
MTOW MAXIMUM TAKE OFF WEIGHT