|
Definition
|
Contraction
|
Usage
|
|
Mach
number
|
M
|
GEN
|
|
MACH
Number (speed ratio to speed of sound)
|
MACH
|
ATC
|
|
Mackay
Radio and Telegraph Company
|
MACKAY
|
GEN
|
|
magnetic
|
MAG
|
GEN
|
|
magnetic
bearing
|
QDR
|
ICAO
|
|
magnetic
heading
|
MHDG
|
GEN
|
|
magnetic
heading
|
QDM
|
ICAO
|
|
magnetic
orientation of runway
|
QFU
|
ICAO
|
|
magnetic
variation
|
VAR
|
ICAO
|
|
main
meteorological office
|
MMO
|
NWS
|
|
mainland
|
MNLD
|
NWS
|
|
mainly
|
MNLY
|
GEN
|
|
maintain
|
MNTN
|
ICAO
|
|
maintain
a position VFR and advise
|
MPVA
|
ATC
|
|
maintain
at least (altitude)
|
MAL
|
ATC
|
|
maintain
flight level
|
MFL
|
ATC
|
|
maintain
Mach
|
MMACH
|
ATC
|
|
maintain
VFR
|
MVFR
|
ATC
|
|
maintain
visual separation
|
MVSP
|
ATC
|
|
maintain
well to right of course
|
MWRC
|
ATC
|
|
maintaining
visual flight (Special VFR)
|
VF
|
ATC
|
|
maintenance
|
MAINT
|
ICAO
|
|
maintenance
assumes monitor
|
MAM
|
GEN
|
|
maintenance
check
|
MCK
|
GEN
|
|
maintenance
returns monitor
|
MRM
|
GEN
|
|
make
altitude changes VFR
|
MACVFR
|
ATC
|
|
make
check turn
|
MKCT
|
ATC
|
|
make
descent from
|
MDFR
|
ATC
|
|
make
good a magnetic track of (degrees)
|
MGMT
|
ATC
|
|
make
good a track of (degrees)
|
MGAT
|
ATC
|
|
management
|
MGMT
|
GEN
|
|
manager
|
MGR
|
GEN
|
|
maneuver
|
MNVR
|
GEN
|
|
Manitoba
|
MAN
|
NWS
|
|
manual
|
MAN
|
GEN
|
|
manual
A1 simplex
|
MAS
|
ICAO
|
|
manual
amendment
|
MANAM
|
GEN
|
|
manual
of operations
|
MANOP
|
GEN
|
|
manufacturing
inspector
|
MI
|
GEN
|
|
map
analysis
|
MA
|
NWS
|
|
marginal
|
MRGL
|
NWS
|
|
marginal
VFR
|
MVFR
|
NWS
|
|
Marine
Corps Air Station
|
MCAS
|
GEN
|
|
Marine
Corps Air Station (Helicopter)
|
MCAS(H)
|
GEN
|
|
maritime
|
MRTM
|
NWS
|
|
maritime
(air mass)
|
M
|
NWS
|
|
marked
|
MKD
|
GEN
|
|
marker
|
MKR
|
GEN
|
|
marker
beacon
|
MB
|
GEN
|
|
marker
radio beacon
|
MKR
|
ICAO
|
|
Master
Control Station
|
MCS
|
ATC
|
|
master
flight plan on file
|
MFPOF
|
ATC
|
|
material
|
MTRL
|
GEN
|
|
maximum
|
MAX
|
GEN
|
|
maximum
authorized (IFR) altitude
|
MAA
|
GEN
|
|
maximum
usable altitude
|
MUA
|
GEN
|
|
maximum
usable frequency
|
MUF
|
GEN
|
|
meaconing,
intrusion, jamming, interference
|
MIJI
|
ATC
|
|
mean
sea level
|
MSL
|
ICAO
|
|
mechanic
|
MECH
|
GEN
|
|
mechanical
reliability report
|
MRR
|
GEN
|
|
medical
|
MED
|
GEN
|
|
medical
emergency evacuation
|
MEDEVAC
|
ICAO
|
|
medium
|
MED
|
GEN
|
|
medium
and high frequency directionfinding
station (same location)
|
MHDF
|
ICAO
|
|
medium
and very high frequency directionfinding
station (same location)
|
MVDF
|
ICAO
|
|
medium
frequency
|
MF
|
GEN
|
|
medium
frequency direction finding station
|
MDF
|
ICAO
|
|
medium
high and very high frequency directionfinding
station (same location)
|
MHVDF
|
ICAO
|
|
medium
intensity approach lighting system
|
MALS
|
GEN
|
|
medium
intensity approach lighting system with runway alignment
indicator lights
|
MALSR
|
GEN
|
|
medium
intensity approach lighting system with sequenced flashers
|
MALSF
|
GEN
|
|
medium
intensity runway edge lights
|
MIRL
|
GEN
|
|
medium
range
|
MRG
|
GEN
|
|
megahertz
|
MHz
|
GEN
|
|
melting
level
|
MLTLVL
|
NWS
|
|
memorandum
of agreement
|
MOA
|
GEN
|
|
memorial
|
MEML
|
GEN
|
|
merging
|
MEGG
|
NWS
|
|
Merit
Promotion Program
|
MPP
|
GEN
|
|
message
|
MSG
|
ICAO
|
|
Message
…(transmission identification) has been misrouted
|
MSR
|
ICAO
|
|
message
center
|
MSGCTR
|
GEN
|
|
meteorological
|
MET
|
GEN
|
|
Meteorological
Aeronautical Presentation System
|
MAPS
|
GEN
|
|
meteorological
information for aircraft in flight
|
VOLMET
|
ICAO
|
|
meteorological
officer
|
METOF
|
GEN
|
|
Meteorological
Operational Telecommunications Network Europe
|
MOTNE
|
ICAO
|
|
Meteorological
Watch Office
|
MWO
|
ICAO
|
|
meter
fix time
|
MFXT
|
ATC
|
|
meters
per second
|
MPS
|
ICAO
|
|
metres
(preceded by figures)
|
M
|
ICAO
|
|
metric
units
|
MTU
|
ICAO
|
|
metropolitan
|
METRO
|
GEN
|
|
Mexico
|
MEX
|
NWS
|
|
microwave
landing system
|
MLS
|
GEN
|
|
MidCanada
Identification Zone
|
MIDIZ
|
GEN
|
|
middle
|
MID
|
GEN
|
|
middle
marker
|
MM
|
ICAO
|
|
midnight
|
MIDN
|
NWS
|
|
midpoint
|
MIDPT
|
GEN
|
|
midpoint
(related to RVR)
|
MID
|
ICAO
|
|
Mike
Monroney Aeronautical Center, FAA
|
AAC
|
GEN
|
|
mile
|
MI
|
GEN
|
|
miles
in trail
|
MIT
|
ATC
|
|
miles
per hour
|
MPH
|
GEN
|
|
military
|
MIL
|
ICAO
|
|
Military
Airlift Command
|
MAC
|
GEN
|
|
military
alert system
|
MAS
|
GEN
|
|
military
assumes responsibility for separation of aircraft
|
MARSA
|
GEN
|
|
military,
customs, or police services
|
STATE
|
ICAO
|
|
military
flight service
|
MFS
|
GEN
|
|
military
height finder radar
|
MHFR
|
GEN
|
|
military
operations area
|
MOA
|
ICAO
|
|
Military
Radar Unit
|
MRU
|
GEN
|
|
military
training route
|
MTR
|
GEN
|
|
millibars
|
MB
|
GEN
|
|
millimeter
|
MM
|
GEN
|
|
millivolt
|
MV
|
GEN
|
|
mimeographic notice
|
MIMNO
|
GEN
|
|
minimum
|
MNM
|
ICAO
|
|
minimum
altitude at glide slope intersection inbound
|
MAGSI
|
GEN
|
|
minimum
altitude over facility on final approach course
|
MAFAP
|
ATC
|
|
minimum
crossing altitude
|
MCA
|
ICAO
|
|
minimum
descent altitude
|
MDA
|
ICAO
|
|
minimum
descent height
|
MDH
|
ICAO
|
|
minimum
en route altitude
|
MEA
|
ICAO
|
|
minimum
eye height over threshold
|
MEHT
|
ICAO
|
|
minimum
fuel on board
|
MFOB
|
ATC
|
|
minimum
holding altitude
|
MHA
|
GEN
|
|
minimum
interval takeoff
|
MITO
|
ATC
|
|
minimum
navigation performance specification
|
MNPS
|
ATC
|
|
minimum
navigation performance specification airspace
|
MNPSA
|
ATC
|
|
minimum
obstacle clearance (required)
|
MOC
|
ICAO
|
|
minimum
obstruction clearance altitude
|
MOCA
|
ICAO
|
|
Minimum
operational performance standards
|
MOPS
|
ICAO
|
|
minimum
reception altitude
|
MRA
|
GEN
|
|
minimum
requirements specified
|
MIREQ
|
GEN
|
|
minimum
safe altitude warning
|
MSAW
|
GEN
|
|
minimum
safe/sector altitude
|
MSA
|
GEN
|
|
minimum
terrain clearance altitude
|
MTCA
|
GEN
|
|
minimum
vector altitude
|
MVA
|
GEN
|
|
minimum
when control zone effective
|
MCZNE
|
GEN
|
|
Ministry
of Transport (Canada)
|
MOT
|
GEN
|
|
minus
|
MS
|
NWS
|
|
minute
|
MIN
|
ICAO
|
|
minutes
in trail
|
MINIT
|
ATC
|
|
miscellaneous
|
MISC
|
GEN
|
|
missed
approach point
|
MAP
|
GEN
|
|
missed
approach point
|
MAPT
|
ICAO
|
|
missile
|
MISL
|
GEN
|
|
missing
|
MISG
|
GEN
|
|
missing
(weather reports only)
|
M
|
NWS
|
|
Missing
…(transmission identification)
|
MIS
|
ICAO
|
|
mist
|
BR
|
METAR
|
|
mixed
|
MXD
|
NWS
|
|
moderate
|
MDT
|
GEN
|
|
moderate
|
MOD
|
GEN
|
|
moderate
or greater
|
MOGR
|
NWS
|
|
modernization
|
MDZN
|
GEN
|
|
modernize
|
MDZ
|
GEN
|
|
modernized
weather teletypewriter communications system
|
MWTCS
|
GEN
|
|
modify
|
MDFY
|
GEN
|
|
modulate
or modulation or modulator
|
MOD
|
GEN
|
|
modulated
continuous wave
|
MCW
|
ICAO
|
|
Mohawk
Valley
|
MHKVLY
|
NWS
|
|
moisture
|
MSTR
|
NWS
|
|
momentary
|
MTRY
|
GEN
|
|
Monday
|
MON
|
ICAO
|
|
monitor
|
MNT
|
ICAO
|
|
monitor
|
MONTR
|
NWS
|
|
monitor
out of service
|
MONOS
|
GEN
|
|
monitor
resumed normal operation
|
MONOK
|
GEN
|
|
monitor
station reports
|
MOREPS
|
GEN
|
|
Monopulse
secondary surveillance radar
|
MSSR
|
ICAO
|
|
morning
|
MRNG
|
NWS
|
|
mostly
|
MSTLY
|
NWS
|
|
mountain
|
MT
|
ICAO
|
|
mountain
|
MTN
|
NWS
|
|
Mountain
Standard Time (time groups only)
|
M
|
NWS
|
|
mountain
wave
|
MTW
|
ICAO
|
|
move
|
MOV
|
NWS
|
|
moving
target indicator
|
MTI
|
ATC
|
|
multiobject phase
tracking and ranging
|
MOPTAR
|
GEN
|
|
multiple
|
MULT
|
GEN
|
|
municipal
|
MUNI
|
GEN
|
|
municipal
airport
|
MARPT
|
GEN
|
|
must
ride company material
|
RIMAT
|
GEN
|