AviationOnline for EASA Part-66 & Groundschool

AviationOnline
for EASA Part-66 & Groundschool

Aviation Glossary

An A-Z of all aviation abbreviations

This online glossary provides a comprehensive list of all major aviation abbreviations.


L

LAT

latitude

LCD

liquid crystal display

LIB

left inboard

LCN

load classification number

L/G

landing gear

LGCIU

landing gear control interface unit

LGPIU

landing gear position indicator unit

LIS

localiser inertial smoothing

LNA

low noise amplifier

LNAV

lateral navigation

LO

LOB

left outboard

LOC

localiser

LONG

longitude

LP

low pressure

LPC

low pressure compressor

LPT

low pressure turbine

LRRA

low range radio altimeter

LRM

line replaceable module

LRU

line replaceable unit

LVP

low visibility procedure

LW

landing weight

M

m

metre

Mach

ratio of TAS to the current speed of sound

mb

millibar

MAT

maintenance access terminal

MCP

module control panel

MCT

maximum continuous thrust

MCDU

multipurpose control and display unit

MCU

modular concept unit

MDA

minimum descent altitude

MEC

main equipment centre

MEL

minimum equipment list

MES

main engine start

MFA

memorised fault annunciator

MFD

multi-function display

MG

MGSCU

main gear steering control unit

MLS

microwave landing system

MLW

maximum landing weight

MMEL

master minimum equipment list

MMO

maximum operating Mach

MRO

maintenance, repair and overhaul

MRIU

maintenance and recording interface unit

MSA

minimum safe altitude

MSL

mean sea level

MSU

mode selector unit

MTBF

mean time between failure

MTOW

maximum take-off weight

MZFW

minimum zero fuel weight

N

NAVAID

navigational aid

NCD

non-computed data

ND

navigational display

NDB

non-directional beacon

notam

notice to airmen

NM

nautical mile

NW

nosewheel

O

OAT

outside air temperature

OBRM

onboard replaceable module

OEM

original equipment manufacturer

OEU

overhead electronics unit

OPAS

overhead panel ARINC system

OPBC

overhead panel bus controller

OPR

once per revolution

OPU

overspeed protection unit

OVBD

overboard

OVHD

overhead

OVHT

overheat

OVRD

override

OVSPD

overspeed

oxy

oxygen