Aviation Maintenance Terms beginning with M
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MAP
Manifold absolute pressure. The absolute pressure that exists within the induction system of a reciprocating engine. It is the MAP that forces air into the cylinders of the engine. MAP is commonly called manifold pressure.
MEK
Methul ethyl ketone. A volatile, water soluble, organic chemical compound that is used as a solvent to remove oily contaminants from ignition system components.
MFD
Multifunction display. A liquid crystal or CRT display that shows a number of parameters and replaces several analog-type indicators.
MEK
Methyl-ethyl-ketone is an organic chemical solvent that is soluble in water and is used as a solvent for vinyl and nitrocellulose films. MEK is an efficient cleaner for preparing surfaces for priming or painting.
MFD
Multi-function display.
MHz (megahertz)
1,000,000 cycles per second.
MIG welding
Metal inert gas welding is a form of electric arc welding in which the electrode is an expendable wire. MIG welding is now called GMA (gas metal arc) welding.
MSDS
Material Safety Data Sheets. MSDS are required by the Federal Government to be available in workplaces to inform workers of the dangers that may exist from contact with certain materials.
MSL
Mean sea level. When the letters MSL are used with an altitude, it means that the altitude is measured from mean, or average, sea level.
MTBF
Mean time between failures.
MAC
Mean Aerodynamic Chord
MAN/ELEC
Manual/Electric
MBA
Marker-beacon Antenna
MCDP
Maintenance Control and Display Panel
MCDU
Multipurpose Control and Display Unit
MDE
Modern Digital Electronics
MEC
Main Equipment Center; Main Engine Control
MEG or MEGA
Million
MEK
Methylethylketone
MEM
Memory
METO
Maximum Except-Take Off
MF
(mf) Medium Frequency (300 KHz to 3 MHz)
MHz
Megahertz
MIC
Microphone
MICRO-P
Microprocessor
MIG
Metal Inert Gas
MILLI
One One-thousandth (0.001)
MKR BCN
Marker Beacon
MS
Military Standard
MSDS
Material Safety Data Sheets
MSEC
(ms) Milliseconds
MSG
Message
MTBF
Mean Time-between-failure
MUX
Multiplexer
mV
Millivolts
m/s
Meters per second
MCP
Mode Control Panel
MHz
Megahertz
MOPS
Minimum Operational Performance Standards
MSL
Mean Sea Level
m
meter (or “metre”), the SI metric system base unit for length
MCDU
Multi-Function Control and Display Unit
MFD
Multi-Function Display
MHz
Mega Hertz
MOPS
Minimum Operation Performance Standards (RTCA documents)
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