|
Contraction
|
Definition
|
Usage
|
|
M
|
in RVR
indicates visibility less than lowest reportable sensor value (e.g. M600)
|
METAR
|
|
M
|
in
temperature field means “minus” or below zero
|
METAR
|
|
M
|
Mach
number
|
GEN
|
|
M
|
maritime
(air mass)
|
NWS
|
|
M
|
metres
(preceded by figures)
|
ICAO
|
|
M
|
missing
(weather reports only)
|
NWS
|
|
M
|
Mountain
Standard Time (time groups only)
|
NWS
|
|
MA
|
map
analysis
|
NWS
|
|
MAA
|
maximum
authorized (IFR) altitude
|
GEN
|
|
MAC
|
Military
Airlift Command
|
GEN
|
|
MACH
|
MACH
Number (speed ratio to speed of sound)
|
ATC
|
|
MACKAY
|
Mackay
Radio and Telegraph Company
|
GEN
|
|
MACVFR
|
make
altitude changes VFR
|
ATC
|
|
MAFAP
|
minimum
altitude over facility on final approach course
|
ATC
|
|
MAG
|
magnetic
|
GEN
|
|
MAGSI
|
minimum
altitude at glide slope intersection inbound
|
GEN
|
|
MAINT
|
maintenance
|
GEN
|
|
MAL
|
maintain
at least (altitude)
|
ATC
|
|
MALS
|
medium
intensity approach lighting system
|
GEN
|
|
MALSF
|
medium
intensity approach lighting system with sequenced flashers
|
GEN
|
|
MALSR
|
medium
intensity approach lighting system with runway alignment indicator lights
|
GEN
|
|
MAM
|
maintenance
assumes monitor
|
GEN
|
|
MAN
|
Manitoba
|
NWS
|
|
MAN
|
manual
|
GEN
|
|
MANAM
|
manual
amendment
|
GEN
|
|
MANOP
|
manual of
operations
|
GEN
|
|
MAP
|
aeronautical
maps and charts
|
ICAO
|
|
MAP
|
missed
approach point
|
GEN
|
|
MAPS
|
Meteorological
Aeronautical Presentation System
|
GEN
|
|
MAPT
|
missed
approach point
|
ICAO
|
|
MAR
|
at sea
|
ICAO
|
|
MARPT
|
municipal
airport
|
GEN
|
|
MARSA
|
military
assumes responsibility for separation of aircraft
|
GEN
|
|
MAS
|
manual A1
simplex
|
ICAO
|
|
MAS
|
military
alert system
|
GEN
|
|
MAX
|
maximum
|
GEN
|
|
MB
|
marker
beacon
|
GEN
|
|
MB
|
millibars
|
GEN
|
|
MCA
|
minimum
crossing altitude
|
GEN
|
|
MCAS
|
Marine
Corps Air Station
|
GEN
|
|
MCAS(H)
|
Marine
Corps Air Station (Helicopter)
|
GEN
|
|
MCK
|
maintenance
check
|
GEN
|
|
MCS
|
Master
Control Station
|
ATC
|
|
MCW
|
modulated
continuous wave
|
ICAO
|
|
MCZNE
|
minimum
when control zone effective
|
GEN
|
|
MDA
|
minimum
descent altitude
|
GEN
|
|
MDF
|
medium
frequency direction finding station
|
ICAO
|
|
MDFR
|
make
descent from
|
ATC
|
|
MDFY
|
modify
|
GEN
|
|
MDH
|
minimum
descent height
|
ICAO
|
|
MDT
|
moderate
|
GEN
|
|
MDZ
|
modernize
|
GEN
|
|
MDZN
|
modernization
|
GEN
|
|
MEA
|
minimum en
route altitude
|
GEN
|
|
MECH
|
mechanic
|
GEN
|
|
MED
|
medical
|
GEN
|
|
MED
|
medium
|
GEN
|
|
MEGG
|
merging
|
NWS
|
|
MEHT
|
minimum
eye height over threshold
|
ICAO
|
|
MEML
|
memorial
|
GEN
|
|
MET
|
meteorological
|
GEN
|
|
METAR
|
aviation
routine weather report
|
ICAO
|
|
METOF
|
meteorological
officer
|
GEN
|
|
METRO
|
metropolitan
|
GEN
|
|
MEX
|
Mexico
|
NWS
|
|
MF
|
medium
frequency
|
GEN
|
|
MFL
|
maintain
flight level
|
ATC
|
|
MFOB
|
minimum
fuel on board
|
ATC
|
|
MFPOF
|
master
flight plan on file
|
ATC
|
|
MFS
|
military
flight service
|
GEN
|
|
MFV
|
forward
visibility more than (miles)
|
ATC
|
|
MFXT
|
meter fix
time
|
ATC
|
|
MGAT
|
make good
a track of (degrees)
|
ATC
|
|
MGMT
|
make good
a magnetic track of (degrees)
|
ATC
|
|
MGMT
|
management
|
GEN
|
|
MGR
|
manager
|
GEN
|
|
MHA
|
minimum
holding altitude
|
GEN
|
|
MHDF
|
medium and
high frequency directionfinding station (same location)
|
ICAO
|
|
MHDG
|
magnetic
heading
|
GEN
|
|
MHFR
|
military
height finder radar
|
GEN
|
|
MHKVLY
|
Mohawk
Valley
|
NWS
|
|
MHVDF
|
medium
high and very high frequency directionfinding station (same location)
|
ICAO
|
|
MHz
|
megahertz
|
GEN
|
|
MI
|
manufacturing
inspector
|
GEN
|
|
MI
|
mile
|
GEN
|
|
MI
|
shallow
|
METAR
|
|
MID
|
middle
|
GEN
|
|
MID
|
midpoint
(related to RVR)
|
ICAO
|
|
MID/ASIA
|
ICAO
Middle East/Asia Region
|
ATC
|
|
MIDIZ
|
MidCanada
Identification Zone
|
GEN
|
|
MIDN
|
midnight
|
NWS
|
|
MIDPT
|
midpoint
|
GEN
|
|
MIFG
|
patches of
shallow fog not deeper than two meters
|
NWS
|
|
MIFG
|
shallow
fog
|
METAR
|
|
MIJI
|
meaconing,
intrusion, jamming, interference
|
ATC
|
|
MIL
|
military
|
GEN
|
|
MIMNO
|
mimeographic
notice
|
GEN
|
|
MIN
|
minute
|
GEN
|
|
MINIT
|
minutes in
trail
|
ATC
|
|
MIREQ
|
minimum
requirements specified
|
GEN
|
|
MIRL
|
medium
intensity runway edge lights
|
GEN
|
|
MIS
|
Missing
…(transmission identification)
|
ICAO
|
|
MISC
|
miscellaneous
|
GEN
|
|
MISG
|
missing
|
GEN
|
|
MISL
|
missile
|
GEN
|
|
MIT
|
miles in
trail
|
ATC
|
|
MITO
|
minimum
interval takeoff
|
ATC
|
|
MKCT
|
make check
turn
|
ATC
|
|
MKD
|
marked
|
GEN
|
|
MKR
|
marker
|
GEN
|
|
MKR
|
marker
radio beacon
|
ICAO
|
|
MLS
|
microwave
landing system
|
GEN
|
|
MLTLVL
|
melting
level
|
NWS
|
|
MM
|
middle
marker
|
ATC
|
|
MM
|
millimeter
|
GEN
|
|
MMACH
|
maintain
Mach
|
ATC
|
|
MMO
|
main
meteorological office
|
NWS
|
|
MNLD
|
mainland
|
NWS
|
|
MNLY
|
mainly
|
GEN
|
|
MNM
|
minimum
|
ICAO
|
|
MNPS
|
minimum
navigation performance specification
|
ATC
|
|
MNPSA
|
minimum
navigation performance specification airspace
|
ATC
|
|
MNT
|
monitor
|
ICAO
|