MAG Magnetic
MAN Manual
MAP Missed Approach Point
MAU Modular Avionics Unit
MAX Maximum
MB Marker Beacon
MCDU Multifunction Control Display Unit
MCL Master Caution Light
MCP Maximum Continuous Power
MDA Minimum Descent Altitude
MEM Memory
MFD Multi-Function Display
MGB Main Gear Box
MIC Microphone
MIN Minimum
MISC Miscellaneous
MKR BCN Marker Beacon
MLG Main Landing Gear
MMEL Master Minimum Equipment List
MOT Mark On Target
MPFDR Multipurpose Flight Data Recorder
MPOG Minimum Pitch On Ground
MR Main Rotor
MRA Main Rotor Actuator
MRC Modular Radio Cabinet
MRDS Main Rotor Drive System
MSG Message
MSTR Master
MTBF Mean Time Between Failures
MTTR Maintenance Time to Replace
MWL Master Warning Light
MWS Monitor Warning System
NAV Navigation
NCFUR Non-Critical Failure (EEC)
N-ESS Non Essential
Nf or NF Engine free turbine speed
Ng or NG Engine gas generator speed
NIC Network Interface Controller
NIM Network Interface Module
NLG Nose Landing Gear
NM Nautical Mile
NORM Normal
NO SMK No Smoking
Nr or NR Rotor speed
NVG Night Vision Goggle
NVM Non Volatile Memory
OAT Outside Air Temperature
OC Over Current
OEI One Engine Inoperative
OGE Out of Ground Effect
OS Over Station
OVHD Overhead