Chapter 2. United States of America Aeronautical
Contractions

Section 1. Decode

EXPLANATION OF CODES

GEN - Indicates general aeronautical usage.

NWS - Indicates National Weather Service and aeronautical weather usage.

ATC - Indicates Air Traffic Control usage.

ICAO - Indicates International Civil Aviation Organization usage. International messages should use these.

METAR/TAF - Indicates ICAO weather usage.

A

Contraction

Definition

Usage

+FC

tornado/water spout

METAR

A

absolute (temperature)

NWS

A

Alaskan Standard Time (time groups only)

NWS

A

Amber

GEN

A

arctic (air mass)

NWS

A/A

air to air

ATC

A/C

approach control

ATC

A/G

air to ground

ICAO

A/H

already had

ATC

AAC

Alaskan Air Command

GEN

AAD

Assigned altitude deviation

ICAO

AADC

approach and departure control

ATC

AAF

Army Air Field

GEN

AAITVL

arrival aircraft interval

ATC

AAL

Above aerodrome level

ICAO

AAL

Alaskan Region, FAA

GEN

AAP

Advise if able to proceed

ATC

AAR

airport arrival rate

ATC

AARTE

airport acceptance rate

ATC

AATM

at all times

GEN

AAWF

Auxiliary Aviation Weather Facility

NWS

AAWTA

Advise at what time able

ICAO

AB

Airborne

ATC

ABBR

Abbreviate

GEN

ABCST

automatic broadcast

GEN

ABD

Aboard

GEN

ABI

Advance boundary information

ICAO

ABLCHG

airborne launching

ATC

ABM

abeam

ICAO

ABN

aerodrome beacon

ICAO

ABND

abandon

GEN

ABNDT

abundant

GEN

ABNML

abnormal

GEN

ABT

about

GEN

ABV

above

ICAO

AC

Advisory Circular

GEN

AC

altocumulus

NWS

AC

assistant chief

GEN

ACA

artic control area

ATC

ACARS

Aircraft communication addressing and reporting system

ICAO

ACAS

airborne collision avoidance system

ICAO

ACC

area control center

ATC

ACC

altocumulus castellanus

NWS

ACCID

notification of aircraft accident

ATC

ACCT

account

GEN

ACCUM

accumulate

GEN

ACDNT

accident

GEN

ACDO

Air Carrier District Office

GEN

ACE

Central Region, FAA

GEN

ACES

access

GEN

ACFT

aircraft

ICAO

ACID

aircraft identification

ATC

ACK

acknowledge

GEN

ACL

altimeter check location

ATC

ACLD

above clouds

GEN

ACLS

automatic carrier landing system

GEN

ACLT

accelerate

GEN

ACM

air combat maneuvers

ATC

ACN

aircraft classification number

ICAO

ACN

all concerned notified

GEN

ACNOT

accident notice

GEN

ACP

acceptance (message type designator)

ICAO

ACP

area command post

GEN

ACPT

accept

GEN

ACPY

accompany

GEN

ACR

air carrier

GEN

ACRBT

acrobatic

ATC

ACRS

across

GEN

ACSL

standing lenticular altocumulus

NWS

ACT

active or activated or activity

ICAO

ACT

air combat training

ATC

ACT

Technical Center, FAA

GEN

ACTG

acting

GEN

ACTV

active

GEN

ACTVT

activate

GEN

ACW

aircraft control and warning

GEN

ACYC

Anticyclonic

NWS

AD

Aerodrome

ICAO

ADA

advisory area

ATC

ADAP

Airport Development Aid Program

GEN

ADC

Aerodrome chart

ICAO

ADCF

Air Defense Control Facility

GEN

ADCON

advise or issue instructions to all concerned

GEN

ADCUS

advise customs

GEN

ADDN

addition

GEN

ADE

Air Defense Emergency

GEN

ADF

automatic direction finder

GEN

ADFAP

automatic direction finder approach

ATC

ADIZ

air defense identification zone

GEN

ADJ

adjacent

ICAO  

ADL

aggregate demand list

ATC

ADLO

Air Defense Liaison Officer

GEN

ADLY

arrival delay

ATC

ADMAP

advise by air mail as soon as possible

GEN

ADMIN

administration

GEN

ADMIR

administrator

GEN

ADMIS

aircraft departing at (number of minutes) intervals

ATC

ADMIV

administrative

GEN

ADNL

additional

GEN

ADNL TFC

additional traffic is

ATC

ADNOK

advise if not correct

ATC

ADO

Aerodrome office (specify service)

ICAO

ADO

Airport District Office

GEN

ADP

automatic data processing

GEN

ADPE

automatic data processing equipment

GEN

ADPS

automatic data processing systems

GEN

ADQT

adequate

GEN

ADR

airport departure rate

ATC

ADR

advisory route

ATC

ADRDE

advise reason for delay

ATC

ADRNDCK

adirondack

NWS

ADRT

alternate departure route

ATC

ADS

address

GEN

ADS

Air Defense Sector

GEN

ADS

automatic dependent surveillance

ICAO

ADS-B

Automatic Dependent Surveillance-B

ICAO

ADSPN

advise disposition

GEN

ADSU

automatic dependent surveillance unit

ICAO

ADV

advise

NWS

ADVALT

allotment advice

GEN

ADVC

advice

GEN

ADVCTN

advection

NWS

ADVN

advance

GEN

ADVY

advisory

NWS

ADVZY

advisory

ATC

ADW

air defense warning

GEN

ADZ

advise

ICAO

ADZAR

advise arrival

ATC

ADZI

advise intentions

ATC

ADZOF

advise this office

GEN

ADZY

advisory

ATC

ADZY

advisory

GEN

AEA

Eastern Region, FAA

GEN

AEM

aircraft and engine mechanic

GEN

AENG

airways engineer

GEN

AER

approach end runway

GEN

AERO

aeronautical

GEN

AES

aircraft earth station

ICAO

AEU

Europe, Africa, and Middle East Office, FAA

GEN

AEVAC

air evacuation

ATC

AEW

airborne early warning

GEN

AFB

Air Force Base

GEN

AFC

area forecast center

NWS

AFCT

affect

GEN

AFDK

after dark

NWS

AFIL

filed flight plan in the air

GEN

AFIO

authorization for interceptor operations

ATC

AFIRM

affirmative

GEN

AFIS

aerodrome flight information service

ICAO

AFJ

Air Force Jet

ATC

AFM

affirmative

ICAO

AFNEA

Air Force NOTAM Exchange Area

GEN

AFNEO

Air Force NOTAM Exchange Office

GEN

AFOVRN

Air Force overrun 1000-ft standard approach lighting system

MIL

AFRCC

Air Force Rescue Coordination Center

GEN

AFREP

Air Force Representative to the FAA

GEN

AFRT

air freight

GEN

AFS

aeronautical fixed service

GEN

AFT

after

GEN

AFTN

Aeronautical Fixed Telecommunications Network

GEN

AFTN

afternoon

GEN

AG

air ground

ATC

AGA

aerodromes, air routes and ground aids

ICAO

AGACS

automatic ground air/ground communication system

GEN

A-GEAR

arresting gear

GEN

AGL

above ground level

ICAO

AGL

Great Lakes Region, FAA

GEN

AGN

again

GEN

AGR

agree

GEN

AGRMT

agreement

GEN

AHD

ahead

GEN

AI

arrival approved request for IFR flight

ATC

AIA

advise if able

ATC

AIATSC

all international air traffic switching centers

GEN

AIC

Aeronautical Information Circular

GEN

AID

airport information desk

GEN

AIDC

Air traffic services inter-facility data communication

ICAO

AIFP

activate IFR flight plan

ATC

AILS

automatic instrument landing system

GEN

AIM

Airman's Information Manual

GEN

AIP

Aeronautical Information Publication

ATC

AIP

aeronautical information publications (In General)

GEN

AIRAC

aeronautical information regulation and control

GEN

AIRCOMNET

Air Force Communications Network

GEN

AIREP

air report

GEN

AIRFL

air refueling

ATC

AIRMET

Airmen's Meteorological Information

GEN

AIROPNET

air operations network

GEN

AIS

aeronautical information service

GEN

AIS

aeronautical information specialist

GEN

AIS

airport in sight

GEN

AL

all (when used as prefix)

GEN

AL

annual leave

GEN

AL/(---)

at least (altitude)

ATC

ALA

alighting area

GEN

ALACFO

all air carrier field offices

GEN

ALADLO

all air defense liaison officers in service area

GEN

ALAFFO

all technical operations

GEN

ALANO

all accident notice offices

GEN

ALARTC

all air route traffic control centers in service area

GEN

ALAT

all air traffic service personnel in service area

GEN

ALATAS

all air traffic (area) supervisors in service area

GEN

ALATF

all air traffic field facilities

GEN

ALATFO

all air traffic field offices

GEN

ALCKT

all offices having send-receive teletypewriter service on circuit

GEN

ALCS/C

all air traffic combined station/centers in service area

GEN

ALCS/T

All air traffic combined station/towers in service area

GEN

ALCT

attempt to locate

GEN

ALDA

Air Line Dispatchers Association

GEN

ALERFA

alert phase code (alerting service)

ATC

ALF

aloft

NWS

ALFAA

all FAA field offices and personnel

GEN

ALFAB

all FAA offices on NADIN

GEN

ALFSFO

all flight standards field offices

GEN

ALFSS

all flight service stations in service area

GEN

ALG

along

GEN

ALGHNY

Allegheny

NWS

ALIATSC

all international aeronautical telecommunication switching centers

GEN

ALIFO

all international field offices

GEN

ALIFSS

all international flight service stations in service area

GEN

ALNMT

alignment

GEN

ALNOT

alert notice

GEN

ALP

airport layout plan

GEN

ALPA

Air Line Pilots Association

GEN

ALQDS

all quadrants

NWS

ALR

alerting

ICAO

ALRAFAC

all radar ATC facilities in service area

GEN

ALRGN

all regional/service area offices

GEN

ALS

approach light system

ICAO  

ALSEC

all sectors

NWS

ALSF-1

standard 2400' high-intensity approach lighting system with sequenced flashers (Category I configuration)

GEN

ALSF-2

standard 2400' high-intensity approach lighting system with sequenced flashers (Category II configuration)

GEN

ALSTG

altimeter setting

GEN

ALT

altitude

ICAO

ALTA

Alberta

NWS

ALTM

altimeter

GEN

ALTN

alternate or alternating

ICAO

ALTN

alternate (aerodrome)

ICAO

ALTPT

alternate airport

GEN

ALTRV

altitude reservation

GEN

ALTWR

all ATC towers in service area

GEN

ALUTN

Aleutian

NWS

ALWF

actual wind factor

NWS

AM

ante meridiem

NWS

AMA

area minimum altitude

ICAO

AMB

ambiguity

GEN

AMC

Air Mobility Command

ATC

AMC

Mike Monroney Aeronautical Center, FAA

GEN

AMCL

amended clearance

ATC

AMD

amend / amended forecast

GEN/

AMDT

amendment

ICAO

AMECH

account mechanical

GEN

AMGR

airport manager

GEN

AMIS

aircraft movement information services

GEN

AMOS

Automatic Meteorological Observing System

GEN

AMP

Amplifier or amplify

GEN

AMPLTD

amplitude

NWS

AMRF

amended route of flight

ATC

AMS

aeronautical mobile service

GEN

AMS

air mass

NWS

AMS

American Meteorological Society

NWS

AMSL

above mean sea level

GEN

AMSS

aeronautical mobile satellite service

ICAO

AMT

Amount

GEN

AMVER

Automated Mutual-Assistance Vessel Rescue System

ATC

ANC

Aeronautical chart 1:500 000 (followed by name/title)

ICAO

ANCPT

anticipate

GEN

ANCS

Aeronautical navigation chart small scale (followed by name/title scale)

ICAO

ANE

New England Region, FAA

GEN

ANF

air navigation facility

GEN

ANG

Air National Guard

GEN

ANLYS

Analysis

NWS

ANM

Northwest Mountain Region, FAA

GEN

ANMS

Automatic Network Management System

GEN

ANNC

announce

GEN

ANR

Advanced Navigation Routes

ATC

ANRA

air navigation radio aids

GEN

ANS

answer

GEN

ANT

antenna

GEN

AO1

ASOS automated observation without precipitation discriminator (rain/snow)

METAR

AO2

ASOS automated observation with precipitation discriminator (rain/snow)

NWS

AOA

at or above

ATC

AOAF

at or after

ATC

AOB

at or below

ATC

AOBF

at or before

ATC

AOC

aerodrome obstacle chart (followed by type & name/title)

ICAO

AOC

airport operating certificate

GEN

AOCP

aircraft out of commission for parts

GEN

AOE

airport of entry

GEN

AOPA

Aircraft Owners and Pilots Association

GEN

AP

airport

ICAO

AP

anomalous propagation

ATC

APAP

approach path alignment panel

GEN

APAPI

Abbreviated precision approach path indicator

ICAO

APC

area positive control

ATC

APCH

approach

ICAO  

APDC

Aircraft parking/docking chart (followed by name/title)

ICAO

APL

airport lights

GEN

APLCN

Appalachian

NWS

APN

Apron

ICAO

APNT

appoint

GEN

APP

approach control or approach control office

ICAO

APPA

advise present position and altitude

ATC

APPR

appear

GEN

APR

airports program report

GEN

APREQ

approval request

GEN

APRNT

apparent

GEN

APROP

appropriate

GEN

APRX

approximate

GEN

APS

airborne pulse search radar

GEN

APSG

after passing

ICAO

APV

approve

GEN

APVL

approval

GEN

AR

Atlantic Route

ATC

ARAC

area airports checked

ATC

ARAC

Army Radar Approach Control facility (US Army)

GEN

ARAD

altitude radial

ATC

ARB

Air Reserve Base

GEN

ARC

Area chart

ICAO

ARCP

air refueling control point

ATC

AREP

air refueling egress point

ATC

AREX

air refueling exit

ATC

ARFF

aircraft rescue and fire fighting

ATC

ARFFOK

airport rescue and fire fighting alarm checked

ATC

ARFOR

area forecast

GEN

ARINC

Aeronautical Radio, Incorporated

GEN

ARIP

air refueling initial point

ATC

ARL

Aerial

ATC

ARLO

Army Liaison Officer

GEN

ARMET

forecast upper wind and temperature at specified points

GEN

ARML

Airmail

GEN

ARND

Around

GEN

ARNG

Arrange

GEN

ARNOT

area notice

GEN

ARO

air traffic services reporting office

GEN

ARO

Airport Reservations Office

GEN

ARP

aerodrome reference point

ICAO

ARP

airport reference point

GEN

ARP

airport reservation position

GEN

ARP

air-report

GEN

ARPT

Airport

GEN

ARQ

automatic error correction equipment

GEN

ARR

arrive or arrival

ICAO

ARS

Air Rescue Service (USAF)

GEN

ARS

special air-report

GEN

ARSA

airport radar service area

ATC

ARSR

air route surveillance radar

GEN

ARST

arrest

GEN

ARST

arresting

ICAO

ARTC

air route traffic control

GEN

ARTCC

Air Route Traffic Control Center

GEN

ARTS

Automated Radar Terminal Systems

GEN

ARU

Airborne Radar Unit

GEN

ARU

Airspace Reservation Unit (Canadian)

GEN

ARUNK

arrival unknown

ATC

AS

altostratus

NWS

AS/R

automatic send/receive

GEN

ASAP

as soon as possible

GEN

ASC

ascent to

GEN

ASCU

automatic scanning control unit

GEN

ASD

airspace docket

GEN

ASDA

accelerate-stop distance available

ICAO

ASDE

airport surface detection equipment

GEN

ASE

Altimetry system error

ICAO

ASGN

assign

GEN

ASHTAM

Volcanic Ash Advisory

ICAO

ASI

altimeter setting indicator

GEN

ASIP

airspace flight inspection pilot

GEN

ASL

above sea level

GEN

ASMD

assumed

ATC

ASND

ascend

GEN

ASO

Southern Region, FAA

GEN

ASOS

automated surface observing system

NWS

ASP

airport system plan

GEN

ASP

airspace

GEN

ASPH

asphalt

ICAO

ASR

airport surveillance radar

GEN

ASSOC

associate

GEN

ASST

assistant

GEN

ASW

Southwest Region, FAA

GEN

ATA

actual time of arrival

ATC

ATA

Air Transport Association of America

GEN

ATAM

at and maintain

ATC

ATAR

above transmitted as received

GEN

ATC

air traffic control

ICAO  

ATCA

Air Traffic Control Association

GEN

ATCA

ATC advises

ATC

ATCAA

ATC assigned airspace

ATC

ATCBI

ATC beacon interrogator

GEN

ATCC

ATC clears

ATC

ATCF

ATC facility

GEN

ATCH

attach

GEN

ATCOR

ATC operations representative

GEN

ATCR

ATC requests

ATC

ATCRBS

ATC radar beacon system

GEN

ATCS

ATC specialist

GEN

ATCSCC

David J. Hurley ATC System Command Center

GEN

ATCT

Airport Traffic Control Tower

GEN

ATD

actual time of departure

ATC

ATFC

account traffic

GEN

ATFM

air traffic flow management

ICAO

ATIS

automatic terminal information service

ICAO

ATLC

Atlantic

NWS

ATM

air traffic management

ICAO

ATM

air traffic manager

ATC

ATM

authentication maneuver

ATC

ATMT

attempt

GEN

ATMTC

attempt to contact

ATC

ATN

Aeronautical Telecommunications Network

ICAO

ATND

attend

GEN

ATO

aeronautical telecommunications operator

GEN

ATO

Air Traffic Organization

GEN

ATOG

allowable take-off gross weight

GEN

ATP

actual time of penetration

ATC

ATP

air traffic procedures

GEN

ATPAC

Air Traffic Procedures Advisory Committee

GEN

ATR

air transport rating

GEN

ATREP

air traffic representative

GEN

ATRLS

actual time of release

ATC

ATSCCP

Air Traffic Service Contingency Command Post

GEN

ATT

American Telephone and Telegraph Company

GEN

ATTM

at this time

GEN

ATTN

attention

GEN

AT-VASIS

Abbreviated T visual approach slope indicator system

ICAO

ATZ

aerodrome traffic zone

ICAO

AUGRA

authority granted

GEN

AURBO

Aurora Borealis

NWS

AUREQ

authority is requested

GEN

AUTH

authority

GEN

AUTH

authorized or authorization

ICAO

AUTO

automatic

ICAO

AUTOB

automatic weather reporting system

GEN

AUW

all up weight (gross weight)

GEN

AUX

auxiliary

GEN

AUZ

authorize

GEN

AVANA

altitude reservation void for aircraft not airborne by ---

ATC

AVBL

available or availability

ICAO 

AVFP

activate VFR flight plan

ATC

AVFPNO

pilot failed to activate VFR/DVFR flight plan

ATC

AVG

average

GEN

AVGAS

aviation gasoline

ICAO

AVN

aviation

GEN

AWA

advise when able

ATC

AWANS

Aviation Weather and NOTAM System

GEN

AWBE

automatic weather broadcast equipment

GEN

AWE

advise when established

ATC

AWL

all weather landing

ATC

AWOS

automatic weather observing/reporting system

GEN

AWP

aviation weather processors

NWS

AWP

Western-Pacific Region, FAA

GEN

AWS

air weather service (USAF)

GEN

AWT

await or awaiting

GEN

AWX

account weather

GEN

AWY

airway

ICAO

AXPS

air express

GEN

AZM

azimuth

ICAO

AZRAN

azimuth and range data

ATC

,

B

Contraction

Definition

Usage

B

base leg

ATC

B

beginning of precipitation (time in minutes) (weather reports only)

NWS

B

Bering Standard Time (time groups only)

NWS

B

blue

GEN

B

center clearance delivered

ATC

BA

braking action

ICAO

BAC

below all clouds

ATC

BACLIN

baroclinic or baroclinic prognosis

NWS

BAFVC

bids accepted for the following vacancies

GEN

BAL

balance

GEN

BASE

cloud base

GEN

BASOPS

Base Operations Office

GEN

BATROP

barotropic or barotropic prognosis

NWS

BC

back course

GEN

BC

beginning climb

ATC

BC

British Columbia

NWS

BC

patches

METAR

BCFG

fog patches

NWS

BCH

beach

NWS

BCKG

backing

NWS

BCM

back course marker

GEN

BCM

become

GEN

BCN

beacon

ICAO  

BCREQ

broadcast requested

ATC

BCST

broadcast

ICAO  

BCSTN

broadcast station

GEN

BDA

Bermuda

NWS

BDAT

beacon data (digitized)

ATC

BDR

border

GEN

BDRY

boundary

ICAO  

BDSLD

bids solicited

GEN

BECMG

becoming (expected between 2 digit beginning hour and 2 digit ending hour)

TAF

BFDK

before dark

NWS

BFR

before

GEN

BGN

began or begin

GEN

BGND

begin or beginning descent

ATC

BHND

behind

GEN

BIFR

before encountering IFR conditions

ATC

BINOVC

breaks in overcast

NWS

BKN

broken

METAR

BL

blowing

METAR

BLD

build

NWS

BLDG

building

ICAO

BLDU

blowing dust

METAR

BLDUP

buildup

NWS

BLKHLS

Black Hills

NWS

BLKT

blanket

NWS

BLN

balloon

GEN

BLO

below

GEN

BLO

below clouds

ICAO

BLSA

blowing sand

METAR

BLSN

blowing snow

METAR

BLW

below

ICAO

BLX

block

ATC

BLZD

blizzard

NWS

BMBR

bomber

GEN

BMS

basic meteorological services

NWS

BND

bound

GEN

BNDRY

boundary

NWS

BNTH

beneath

GEN

BOMB

bombing

GEN

BOVC

base of overcast

NWS

BPOC

before proceeding on course

ATC

BPS

bytes per second

GEN

BPT

beginning procedure turn

ATC

BR

Bahama Route

ATC

BR

branch

GEN

BR

mist

METAR

BRAG

braking action good

GEN

BRAM braking action medium GEN

BRAN

braking action nil

GEN

BRAP

braking action poor

GEN

BRF

brief

NWS

BRG

bearing

GEN

BRGT

bright

GEN

BRITE

bright radar indicator tower equipment

GEN

BRK

break

NWS

BRKG

braking

ICAO

BRKHIC

breaks in higher overcast

NWS

BRKSHR

Berkshire

NWS

BRM

barometer

NWS

BS

commercial broadcasting station

ICAO

BSAF

bids solicited as follows

GEN

BSC

bird sweep completed

ATC

BSHP

beginning standard holding procedure

ATC

BSIAP

beginning straight-in approach

ATC

BSRAP

beginning standard range approach

ATC

BSRO

begin standard refuel orbit

ATC

BT

back taxiing

ATC

BTL

between layers

ICAO

BTN

between

ICAO

BTR

better

GEN

BTWN

between

NWS

BUEC

backup emergency communication

GEN

BUIC

backup interceptor control

ATC

BUL

bulletin

GEN

BUR

bureau

GEN

BUS

business

GEN

BY

blowing spray (weather reports only)

METAR

BYD

beyond

GEN

BZR

buzzer (radar)

GEN

,

C

Contraction

Definition

Usage

C

celsius

GEN

C

Central Standard Time (time groups only)

NWS

C

centre (runway ID)

ICAO

C

circling (approach and landing charts)

ATC

C

continental (air mass)

NWS

C/A

Coarse/Acquisition

ATC

CA

clear above (PIREP only)

ATC

CAAS

Class A Airspace

ATC

CAC

change to approach control or changing to approach control

ATC

CAC

contact approach control

ATC

CACT

civil air carrier turbojet

GEN

CADO

Chief, Airport District Office

GEN

CAM

Canadian Armed Forces Transport Command

GEN

CAN

Canada

NWS

CANFORCE

Canadian Armed Force

GEN

CANO

catalogue number

GEN

CANOT

Canadian NOTAM

GEN

CANR

Canadian NORAD Region

GEN

CAO

change of appointing office

GEN

CAP

Civil Air Patrol

GEN

CAP/IS

combined approach control/international station

GEN

CAPD

climb at pilot s discretion

ATC

CAPT

captain

GEN

CARA

check area airports

GEN

CARF

central altitude reservation function

GEN

CARIB

Caribbean

NWS

CARU

Canadian Airspace Reservation Unit

GEN

CAS

calibrated airspeed

ATC

CAS

collision avoidance system

GEN

CASCDS

cascades

NWS

CAT

category

ICAO

CAT

clear air turbulence

GEN

CATX

climb and cross

ATC

CAUFN

caution advised until further notice

GEN

CAVOK

cloud and visibility OK

NWS

CAVU

clear or scattered clouds and visibility greater than ten miles

NWS

CAWS

common aviation weather subsystem

NWS

CB

cumulonimbus

NWS

CBAS

Class B airspace

ATC

CBMAM

cumulonimbus mamma

NWS

CBSA

Class B surface area

ATC

CC

carbon copy

GEN

CC

cirrocumulus

NWS

CCA

continental control area

GEN

CCAS

Class C airspace

ATC

CCC

Central Computer Complex

GEN

CCC

Regional Communications Control Center

GEN

CCD

City (or County) Civil Defense Director at____

GEN

CCFP

collaborative convective forecast product

ATC

CCLDS

clear of clouds

ATC

CCLKOB

counterclockwise orbit

ATC

CCLKWS

counterclockwise

NWS

CCRU

complete crew

GEN

CCRZ

climb and cruise

ATC

CCSA

Class C surface area

ATC

CCSL

standing lenticular cirrocumulus

NWS

CCTLR

chief controller

GEN

CCUS

cleared Customs

GEN

CD

candela

ICAO

CD

civil defense

GEN

CD

clearance delivery

GEN

CDAS

Class D airspace

ATC

CDC

computer display channel

GEN

CDFNT

cold front

NWS

CDM

collaborative decision making

ATC

CDN

coordination

ICAO

CDO

communications duty officer

GEN

CDSA

Class D surface area

ATC

CE

communications equipment

GEN

CEAS

Class E airspace

ATC

CELNAV

celestial navigation

GEN

CENGR

civil engineer

GEN

CENPAC

Central North Pacific

ATC

CER

climb en route

ATC

CERAP

combined center/RAPCON

GEN

CERT

certificate

GEN

CERTIF

certification

GEN

CESA

Class E surface area

ATC

CF

change frequency to

ICAO

CFA

controlled firing area

ATC

CFAD

composite flight data processing

GEN

CFADC

Canadian Forces Air Defense Command

GEN

CFAP

cleared for approach

ATC

CFM

confirm

GEN

CFM

Confirm or I confirm

ICAO

CFN

confine

GEN

CFP

cold front passage

NWS

CFPL

carryover from previous log

ATC

CFR

Code of Federal Regulations

GEN

CFWSU

central flow weather service unit

GEN

CFY

clarify

GEN

CG

Coast Guard

GEN

CGAS

Class G airspace

ATC

CGAS

Coast Guard Air Station

GEN

CGL

circling guidance light

ICAO

CGLS

Coast Guard LORAN Station

GEN

CGSTN

congestion

GEN

CH

channel

ICAO

CH

This is a channel continuity check of transmission to permit comparison of your record of channel sequence numbers of messages received on the channel

ICAO

CHAP

chapter

GEN

CHARC

characteristic

GEN

CHC

chance

NWS

CHG

change

GEN

CHGO

changing over

ATC

CHM

chemicals

GEN

CHNL

channel

GEN

CHOK

check okay

GEN

CHOV

changeover

ATC

CHRG

charge

GEN

CHSPK

Chesapeake

NWS

CHTR

charter

GEN

CI

cirrus

NWS

CIC

controller in charge

GEN

CIDIN

common ICAO data interchange network

ICAO

CIFP

cancel IFR flight plan

ATC

CIFR

cancel IFR clearance previously given

ATC

CIFRR

Common IFR Room

GEN

CIG

ceiling

NWS

CINCNORAD

Commander in Chief, North American Aerospace Defense Command

GEN

CIRNAV

circumnavigate

ATC

CIRNOT

circuit notice

GEN

CIRVIS

communications instructions for reporting vital intelligence sightings

ATC

CIT

near or over large towns

ICAO

CIV

civil

ICAO

CK

check

ICAO

CKT

circuit

GEN

CL

centre line

ICAO

CL

closing station

GEN

CL

course line

ATC

CLA

clear type of ice formation

ICAO

CLB

climb

ATC

CLBI

climb immediately

ATC

CLBN

crash locator beacon

GEN

CLBR

calibration

ICAO

CLD

cloud

NWS

CLG

calling

ICAO

CLKOB

clockwise orbit

ATC

CLKWS

clockwise

GEN

CLN

colon

GEN

CLNC

clearance

GEN

CLODA

closing date

GEN

CLOTO

close this office

GEN

CLR

clears, or cleared to, or clearance

ICAO  

CLRAP

cleared as planned

ATC

CLRS

clear and smooth

NWS

CLSD

closed

ICAO

CLST

celestial

ATC

CLU

circuit line up

GEN

CM

centimeter

ICAO

CMA

comma

GEN

CMB

climb to or climbing to

ICAO

CMNC

commence

GEN

CMPCT

compact

GEN

CMPL

complete or completed or completion

ICAO

CMPLT

complete

GEN

CMPLX

complex

GEN

CMPSN

composition

GEN

CMPT

component

GEN

CMS

construction maintenance supervisor

GEN

CMSN

commission

GEN

CNCL

cancel

NWS

CNCNT

concurrently

GEN

CNCT

connect

GEN

CNDN

Canadian

NWS

CNL

cancel

GEN

CNLFP

cancel flight plan

ATC

CNS

communications, navigation and surveillance

ICAO

CNS

Consolidated NOTAM System

ATC

CNSTNT

consistent

GEN

CNTR

center

GEN

CNTRL

central

GEN

CNTRLN

centerline

GEN

CNVG

converge

GEN

CNVRT

convert

GEN

CNVSN

conversion

GEN

CNVTV

convective

NWS

CO

company

GEN

CO

county

GEN

COB

close of business

GEN

COC

climb on course

ATC

COLL

collect

GEN

COM

communication

ICAO

COMB

combine

GEN

COML

commercial

GEN

COMLO

compass locator

GEN

COMPR

compare

GEN

COMPRT

compartment

GEN

CONC

concrete

ICAO

CONCA

continue calling until

ATC

COND

condition

ICAO

CONF

confidential

GEN

CONFDC

confidence

NWS

CONFIG

configuration

ATC

CONFIGN

configuration

GEN

CONR

Continental NORAD Region

GEN

CONS

continuous

ICAO

CONSO

CONSOLAN Facility

GEN

CONSOL

consol beacon

GEN

CONSOLAN

low or medium frequency long range navigational aid

GEN

CONST

construction

ICAO

CONT

continue(s) or continued

ICAO

CONTDVD

Continental Divide

NWS

CONTH

continue to hold

ATC

CONTR

contract

GEN

CONTRAILS

condensation trails

NWS

COORD

coordinate

GEN

COORD

Coordinates

ICAO

COP

changeover point

GEN

COPCOM

Controllers Operations and Procedures Committee

GEN

COPT

completed procedure turn

ATC

COR

correct or corrected or correction

GEN

CORAS

corridor assignment

ATC

COREQ

confirming requisition follows

GEN

COT

at the coast

ICAO

COV

cover

ICAO

CP

circular polarization

GEN

CPA

crash phone activated

GEN

CPBL

capable

GEN

CPD

coupled

GEN

CPDLC

Controller pilot data link communications

ICAO

CPF

complete power failure

GEN

CPL

current flight plan

ICAO

CPME

Calibration performance monitoring equipment

GEN

CPN

air transport pulse radar navigation aid

GEN

CPS

air transport pulse radar search

GEN

CPTY

capacity

GEN

CRAD

composite radar data processing

GEN

CRAF

civil reserve air fleet

GEN

CRC

circle

GEN

CRC

Cyclic redundancy check

ICAO

CRCHF

crew chief

GEN

CRLC

circulate

GEN

CRS

course

GEN

CRT

cathode ray tube

GEN

CRTFY

certify

GEN

CRYPTO

cryptographic

GEN

CRZ

cruise

ICAO

CRZAM

cruise and maintain

ATC

CRZWTR

cruise well to right

ATC

CS

Call sign

ICAO

CS

cirrostratus

NWS

CS/C

combined station/center

GEN

CS/T

combined station/tower

GEN

CSATR

climb so as to reach

ATC

CSATX

climb so as to cross

ATC

CSDR

consider

GEN

CSDRBL

considerable

GEN

CSLDT

consolidate

GEN

CST

coast

NWS

CTA

control area

ICAO

CTAF

common traffic advisory frequency

ATC

CTAM

climb to and maintain

ATC

CTAS

controlled airspace

ATC

CTAX

climb to and cross

ATC

CTC

contact

ICAO

CTCC

change to center control or changing to center control

ATC

CTCC

contact center control

ATC

CTCEN

contact center

ATC

CTGY

category

NWS

CTL

control

ICAO

CTLA

control area

GEN

CTLB

control boundary

GEN

CTLR

controller

GEN

CTLZ

control zone

GEN

CTN

caution

GEN

CTR

control zone

ICAO

CTRAC

common terminal radar approach control

GEN

CTSKLS

Catskills

NWS

CU

cumulus

NWS

CUF

cumuliform

ICAO

CUFRA

cumulus fractus

NWS

CUSNO

customs has been notified

GEN

CUST

customs

ICAO

CVFP

cancel VFR flight plan

ATC

CVINO

clearance void if not off

ATC

CVN

convene

GEN

CVR

Cockpit voice recorder

ICAO

CVR

cover

GEN

CVRS

computerized voice reservation system

ATC

CW

continuous wave

ICAO

CWM

change weight manifest

GEN

CWRC

climb well to right of course

ATC

CWSU

central weather service unit

GEN

CWTR

climb well to right

ATC

CWY

clearway

ICAO

CXA

cancel approved arrival

ATC

CXD

cancel approved departure

ATC

CYC

cyclonic

NWS

CYCLGN

cyclogenesis

NWS

CYL

cylinder

GEN

CZM

coastal zone management

GEN

,

D

Contraction

Definition

Usage

D

danger area

ICAO

DA

decision altitude

ICAO

DA

departure approved

ATC

DAAR

deviation approved as requested

ATC

DABRK

daybreak

NWS

DAE

district airport engineer

GEN

DAIRE

direct altitude and identification readout equipment

GEN

DALGT

daylight

GEN

DAP

do all possible

GEN

DAPD

descend at pilot s discretion

ATC

DASI

digital altimeter setting indicator

GEN

D ATIS

Data link Automatic Terminal Information Service

ICAO

D-ATIS Digital-Automatic Terminal Information Service ATC

DB

decibel

GEN

DB

describe

GEN

DBA

doing business as

GEN

DBASI

digital barometer altimeter setting indicator

GEN

DBL

double

GEN

DBTF

doubtful

GEN

DC

direct current

GEN

DCA

Defense Communications Agency

GEN

DCAVU

clear or scattered clouds and visibility greater than ten, remainder of report missing (weather reports only)

NWS

DCD

double channel duplex

ICAO

DCF

deputy chief

GEN

DCKG

docking

ICAO

DCLRT

decelerate

ATC

DCM

defense combat maneuvers

ATC

DCMSN

decommission

GEN

DCMT

document

GEN

DCPC

Direct controller pilot communications

ICAO

DCR

decrease

GEN

DCRZ

descend to and cruise

ATC

DCS

defense communications system

GEN

DCS

double channel simplex

GEN

DCT

direct

ICAO

DDM

difference in depth of modulation

GEN

DE

From (used to precede the call sign of the calling station)

ICAO

DECCO

Defense Commercial Communications Office

GEN

DEF

defense

GEN

DEFCON

Defense Readiness Conditions

GEN

DEG

degree

ICAO 

DELPHO

deliver by telephone

GEN

DEMOL

demolition

GEN

DENEB

fog dispersal operations

ICAO

DEP

depart

ATC

DEP

departure

ICAO

DEPT

department

GEN

DER departure end of runway ICAO

DES

descend to or descending to

ICAO

DESTN

destination

GEN

DETRESFA

Distress Phase Code (Alerting Service)

ATC

DEV

deviation

ATC

DEW

distant early warning

GEN

DEWIZ

distant early warning identification zone

GEN

DFCLT

difficult

GEN

DFDR

Digital flight data recorder

ICAO

DFL

daily flight log

GEN

DFNT

definite

GEN

DFRS

differs

GEN

DFTI

distance from touchdown indicator

GEN

DFUS

diffuse

GEN

DGCGO

dangerous cargo

GEN

DGNL

diagonal

GEN

DGR

danger

GEN

DH

decision height

ICAO

DI

delay indefinite

ATC

DI

departure approval request for IFR flight

ATC

DIAM

diameter

GEN

DIF

diffuse

ICAO

DIR

director

GEN

DISABLD

disabled

GEN

DISC

discontinue

GEN

DISEM

disseminate

GEN

DIST

distance

ICAO

DIST

district

GEN

DISTR

distribute

GEN

DIV

divert

ICAO

DIV

division

GEN

DKTS

Dakotas

NWS

DLA

delay or delayed

ICAO

DLAC

delay account of

ATC

DLAT

delay time

ATC

DLC

delay clearance or delayed clearance

ATC

DLIC

Data link initiation capability

ICAO

DLT

delete

GEN

DLVR

deliver

GEN

DLVY

delivery

GEN

DLY

daily

GEN

DLY

Daily

ICAO

DMAAC

Defense Mapping Agency Aerospace Center

GEN

DMAHC

Defense Mapping Agency Hydrographic Center

GEN

DME

distance measuring equipment

ICAO

DMEG

DME collocated with glide slope

GEN

DMEL

DME collocated with localizer

GEN

DMER

DME tactical air navigation with DME only commissioned

GEN

DMEV

DME collocated with VOR

GEN

DMG

damage

GEN

DMNT

dominant

GEN

DMO

Directives Management Officer, FAA

GEN

DMSH

diminish

NWS

DMSTN

demonstration

GEN

DNA

Defense Nuclear Agency

GEN

DNG

danger

ICAO

DNS

dense

NWS

DNSLP

downslope

NWS

DNSTRM

downstream

NWS

DNWND

downwind

ATC

DO

Deputy Commander for Operations

GEN

DO

ditto

GEN

DOB

date of birth

GEN

DOC

Department of Commerce

GEN

DOD

Department of Defense

GEN

DOE

Department of Energy

GEN

DOLLY

data link

GEN

DOM

domestic

ICAO

DOT

Department of Transportation

GEN

DOT 1

Transport One Secretary of Transportation

ATC

DOT 2

Transport Two Deputy Secretary of Transportation

ATC

DP

deep

NWS

DP

dew point temperature

ICAO

DPCR

departure procedure

ATC

DPNG

deepening

NWS

DPT

depth

ICAO

DPTH

depth

NWS

DR

dead reckoning

ATC

DR

direct route

GEN

DR

low drifting

METAR

DRCT

direct

GEN

DRCTN

direction

GEN

DRDU

low drifting dust

METAR

DRFT

drift

NWS

DRG

during

ICAO

DRIR

direct readout infrared

GEN

DRMS

Distance Root Mean Square

ATC

DRR

Deployment Readiness Review

ATC

DRSA

low drifting sand

METAR

DRSN

low drifting snow

METAR

DRZL

drizzle

NWS

DS

domestic services (island operations)

GEN

DS

dust storm

METAR

DSATR

descend so as to reach

ATC

DSATX

descend so as to cross

ATC

DSB

double sideband

ICAO

DSCNT

descent

ATC

DSGND

designated

GEN

DSIPT

dissipate

NWS

DSN

Defense Switching Network

GEN

DSND

descend

ATC

DSNDI

descend immediately

ATC

DSNT

distant

GEN

DSPL

display

GEN

DSPLC

displace

GEN

DSPN

disposition

GEN

DSPRL

dispersal

GEN

DSR

desire

GEN

DSRGD

disregard

GEN

DST

distort

GEN

DSTC

distance

GEN

DSTND

destined

ATC

DTAM

descend to and maintain

ATC

DTAX

descend to and cross

ATC

DTE

data terminal equipment

GEN

DTF

data transmission feature

GEN

DTG

date time group

GEN

DTHR

Displaced runway threshold

ICAO

DTL

detail

GEN

DTLN

international dateline

NWS

DTR

data transmission request

GEN

DTRM

determine

GEN

DTRT

deteriorate

NWS

DTS

Diplomatic Telecommunications Service

GEN

DTW

dual tandem wheels

ICAO

DU

widespread dust

METAR

DUATS

direct user access terminal system

GEN

DUC

dense upper cloud

ICAO

DUPE

duplicate

GEN

DUPE

This is a duplicate message (to be used in AFS as a procedure signal)

ICAO

DUR

duration

ICAO

DURC

during climb

ATC

DURD

during descent

ATC

DURG

during

GEN

DURN

duration

GEN

DV

distinguished visitors

GEN

DVFR

defense VFR

GEN

DVLP

develop

GEN

D VOLMET

Data link VOLMET

ICAO

DVOR

doppler VHF omni directional radio range

ICAO

DVRG

diverge

GEN

DVRSN

diversion

GEN

DVV

downward vertical velocity

NWS

DW

dual wheels

ICAO

DWG

drawing

GEN

DWNDFTS

downdrafts

NWS

DWPNT

dew point

NWS

DWRC

descend well to right of course

ATC

DWTR

descend well to right

ATC

DX

duplex

GEN

DZ

drizzle

ICAO

,

E

Contraction

Definition

Usage

E

east or eastern longitude

ICAO

E

Eastern Standard Time (time groups only)

NWS

E

ending of precipitation (time in minutes) (weather reports only)

NWS

E

equatorial (air mass)

NWS

E/G

engine generator

GEN

E/R

exchange and repair

GEN

EACLN

expect approach clearance

ATC

EACNL

expect approach clearance not later than

ATC

EADIZ

entering air defense identification zone

ATC

EARTS

en route automated radar tracking system

GEN

EAS

equivalent airspeed

ATC

EAT

expected approach time

ATC

EB

eastbound

ICAO

EBND

eastbound

GEN

ECA

enter control area

ATC

ECAS

enter controlled airspace

ATC

ECD

except change departure to read

ATC

ECM

electronic counter measures

GEN

ECMSN

electronic counter measure mission

ATC

ECOM

en route communications

GEN

ECR

except change route to read

ATC

ECSP

electronic specialist

GEN

EDA

early departure authorized

GEN

EDC

expect departure clearance at

ATC

EDCT

estimated departure clearance (time)

ATC

EDR

expect departure release at

ATC

EEE

Error (to be used in AFS as a procedure signal)

ICAO

EEM

electronic equipment modification

GEN

EENGR

electrical engineer

GEN

EEP

end exercise point

GEN

EET

estimated elapsed time

ICAO

EFA

entire field available

GEN

EFC

expect further clearance at

ATC

EFCT

effect

GEN

EFF

effective

GEN

EFR

expect further routing

ATC

EFTO

encrypt for transmission only

GEN

EG

emergency gear

GEN

EGECON

electronic geographic coordinator navigation system

GEN

EHA

expect higher altitude

ATC

EHF

extremely high frequency (30000 to 300000 MHz)

ICAO

EIT

electronic installation technician

GEN

ELAT

estimated latitude

GEN

ELBA

emergency location beacon aircraft

ICAO

ELEC

electric

GEN

ELECN

electrician

GEN

ELEV

elevate or elevation

ICAO

ELIP

elliptical

GEN

ELMT

electronic mechanic technician

GEN

ELNGT

elongate

NWS

ELONG

estimated longitude

GEN

ELR

extra long range

ICAO

ELSW

elsewhere

GEN

ELT

emergency locator transmitter

GEN

EM

emission

ICAO

EMBD

embedded (in cloud layer)

ICAO

EMBDD

embedded

NWS

EMDO

Engineering and Manufacturing District Office

GEN

EMERG

emergency

ICAO

EMI

electronic maintenance inspector

GEN

EMSU

environment meteorological support unit

NWS

EMT

electronic maintenance technician

GEN

ENCTR

encounter

GEN

END

stop end (related to RVR)

ICAO

ENDCE

endurance

GEN

ENDG

ending

GEN

ENE

east north east

ICAO

ENERN

east northeastern (weather reports only)

NWS

ENEWD

east northeastward (weather reports only)

NWS

ENG

engine

ICAO 

ENGR

engineer

GEN

ENHNCD

enhanced

GEN

ENHNCMNT

enhancement

GEN

ENR

en route

ICAO

ENRC

En route chart (followed by name/title)

ICAO

ENRT

en route

GEN

ENTR

entire

GEN

EOBT

estimated off block time

ICAO

EOD

entered on duty

GEN

EOF

expected operations forecast

NWS

EP

en route penetration

ATC

EPI

expanded position indicator

ATC

EQCRT

equipment certified

GEN

EQPT

equipment

ICAO

EQUIP

equipment

GEN

ER

here

ICAO

ERAD

en route radar (broadband)

GEN

ERMG

en route metering

ATC

ERSP

en route spacing program

ATC

ERY

early

GEN

ESCAT

emergency security control of air traffic

GEN

ESE

east south east

ICAO

ESEC

en route secondary radar beacon (broadband)

GEN

ESERN

east southeastern (weather reports only)

NWS

ESEWD

east southeastward (weather reports only)

NWS

ESNTL

essential

GEN

ESP

en route sequencing program

ATC

EST

estimate or estimation

ICAO

ESTAB

establish

GEN

ESV

expanded service volume

GEN

ET

electronic technician

GEN

ETA

estimated time of arrival

GEN

ETARS

en route tracking automatic radar service

ATC

ETC

et cetera

GEN

ETD

estimated time of departure

GEN

ETE

estimated time en route

GEN

ETFL

each thousand foot level

ATC

ETI

estimated information

ATC

ETIM

elapsed time

ATC

ETO

estimated time over significant point

ICAO

ETOV

estimated time over

ATC

ETP

estimated time of penetration

ATC

ETR

eastern test range

ATC

EU

electronic unit

GEN

EUO

emergency use only

GEN

EV

every

ICAO

EVAC

evacuation

GEN

EVAL

evaluate or evaluation

GEN

EVE

evening

GEN

EVS

electronic voice switching system

GEN

EVT

expect vector to

ATC

EXAM

examination

GEN

EXC

except

ICAO

EXCH

exchange

GEN

EXCLD

exclude

GEN

EXCLV

exclusive

GEN

EXCP

except

GEN

EXCT

execute

GEN

EXDLVY

expedite delivery

GEN

EXEC

executive

GEN

EXEC-1

President on board civil aircraft

GEN

EXEC-1F

President s family is aboard aircraft

GEN

EXEC-2

Vice President is aboard civil aircraft

GEN

EXEC-2F

Vice President s family is aboard aircraft

GEN

EXER

exercise

ICAO

EXP

expect

ICAO

EXPC

expect

GEN

EXPED

expedite

GEN

EXPHO

expedite delivery by telephone

GEN

EXPS

express

GEN

EXQF

expanded quota flow

ATC

EXREP

expedite mail reply

GEN

EXSEC

extra section

GEN

EXSHI

expedite shipment

GEN

EXTD

extend

GEN

EXTN

extension

GEN

EXTRAP

extrapolate

NWS

EXTRM

extreme

NWS

EXTSV

extensive

GEN

,

F

Contraction

Definition

Usage

F

Cleared to fix

ATC

F

fahrenheit

GEN

F

flight inspection

GEN

FA

area forecast

NWS

FA

fuel advisory

ATC

FA

final approach

ATC

FA CENTER

Aviation Area Forecast Center

GEN

FAA

Federal Aviation Administration

GEN

FAA

for an approach to

ATC

FAA 1

SafeAir One Federal Aviation Administration Administrator

ATC

FAA 2

SafeAir Two Federal Aviation Administration Deputy Administrator

ATC

FAAP

federal aid to airports program

GEN

FAAR

FAA requirements

GEN

FAC

facilities

ICAO

FAC

facility

GEN

FACF

facility chief

GEN

FACSFAC

Fleet Area Controlled and Surveillance Facility

ATC

FAD

fuel advisory departure

GEN

FAF

final approach fix

ICAO

FAFAB

FSS assumes flight plan area and Service B

GEN

FAH

fahrenheit

NWS

FAL

facilitation of international air transport

ICAO

FAM

familiar or familiarization

GEN

FAMAE

following amendment authorized effective

GEN

FAP

final approach point

ICAO

FAR

Federal Aviation Regulations

GEN

FATFL

FSS assumes control of tower frequencies and lights

GEN

FAX

facsimile

GEN

FBO

fixed base operator

GEN

FC

funnel cloud

METAR

FCA

frequency change approved

ATC

FCC

Federal Communications Commission

GEN

FCFSS

FAA Contract Flight Service Station

GEN

FCO

facility coordination officer

GEN

FCRP

field condition report

ATC

FCST

forecast

GEN

FCTA

flow control time of arrival

ATC

FCWOS

FAA Contract Weather Observing Station

GEN

FDAT

flight data

GEN

FDC

Flight Data Center

GEN

FDDL

frequency division data link

GEN

FDEP

flight data entry and printout

ATC

FDI

Fault Detection and Isolation

ATC

FDIO

flight data input/output

ATC

FDIOR

flight data input/output repeater

ATC

FDPS

Flight data processing system

ICAO

FE

flight engineer

GEN

FENKN

fuel supply unknown

ATC

FENTL

fuel supply until

ATC

FEW

1 or 2 octas (eighths) cloud coverage

METAR

FEXHA

fuel supply exhausted

ATC

FFC

for further clearance

ATC

FFLT

familiarization flight

GEN

FFMN

fixed federal monitoring network

GEN

FG

fog

METAR

FGSB

FSS guarding Service B

GEN

FI/P

flight information (permanent)

GEN

FI/T

flight information (temporary)

GEN

FIBI

filed but impracticable to transmit

NWS

FIC

Flight Information Center

GEN

FICON

field condition

GEN

FIDO

Flight Inspection District Office

GEN

FIFO

Flight Inspection Field Office

GEN

FIFO H

Flight Inspection Field Office High Altitude

GEN

FIFP

filed IFR flight plan

ATC

FIG

figure

GEN

FIG

flight inspection group

GEN

FIL

filament

GEN

FILG

filling

NWS

FILS

florescan instrument landing system

GEN

FINO

weather report will not be filed for transmission

NWS

FIR

Flight Information Region

GEN

FIRAV

first available

GEN

FIRB

Flight Information Region Boundary

GEN

FIRG

firing

GEN

FIRIV

arrival report will be filed with

ATC

FIS

flight information service

GEN

FISA

automated flight information service

ICAO

FL

flash advisory

NWS

FL

flight level

GEN

FLCTN

fluctuation

GEN

FLD

field

ICAO

FLDST

flood stage

NWS

FLG

falling

NWS

FLG

flashing

ICAO

FLIDAP

flight data position

GEN

FLIP

flight information publication

GEN

FLORL

fluorescent runway lighting (floodlight system)

GEN

FLR

flares

ICAO

FLRY

flurry

NWS

FLT

flight

ICAO

FLTCK

flight check

ICAO

FLTO

flight orders

GEN

FLTWO

flight watch outlet

GEN

FLUC

fluctuating

ICAO

FLW

follow

GEN

FLWIS

flood warning issued

NWS

FM

fan marker

GEN

FM

from

ICAO 

FMAP

fan marker approach

ATC

FMH

fan marker located with radio beacon

GEN

FMO

frequency management officer

GEN

FMS

Flight management system

ICAO

FMT

format

GEN

FMU

flow management unit

ICAO

FNA

final approach

ICAO

FNCTN

function

GEN

FNT

Front

NWS

FNTGNS

frontogenesis

NWS

FNTLYS

frontolysis

NWS

FOB

fuel on board

GEN

FOD

foreign object debris

GEN

FONE

telephone

GEN

FORNN

forenoon

NWS

FP

flight plan

GEN

FPA

flight plan area

ATC

FPB

flight progress board

ATC

FPDI

flight path deviation indicator

GEN

FPL

filed flight plan

ICAO

FPL

full performance level

ATC

FPM

feet per minute

GEN

FPN

fixed pulse radar navigation aid

GEN

FPNO

flight plan not received

GEN

FPP

from present position

ATC

FPR

flight plan route

GEN

FPRC

for possible reclearance

ATC

FPWA

further particulars when available

ATC

FQT

frequent

GEN

FR

fuel remaining

GEN

FRC

full route clearance

GEN

FRD

fix radial distance

ATC

FREQ

frequency

ICAO

FRFAB

FSS returns flight plan area and Service B

GEN

FRH

fly runway heading

ATC

FRI

Friday

ICAO

FRM

form

GEN

FRMG

forming

NWS

FRMN

formation

GEN

FRNG

firing

ICAO

FROPA

frontal passage

NWS

FROSFC

frontal surface

NWS

FRQ

frequent

ICAO

FRSB

FSS returns Service B

GEN

FRST

frost

NWS

FRTFL

FSS returns control of tower frequencies and lights

GEN

FRWF

forecast wind factor

NWS

FRZ

freeze

NWS

FRZLVL

freezing level

NWS

FRZN

frozen

NWS

FSDO

Flight Standards District Office

GEN

FSL

full stop landing

ICAO

FSM

flight schedule monitor

ATC

FSNFO

Flight Standards National Field Office

GEN

FSP

flight strip printer

GEN

FSS

Flight Service Station

ICAO

FST

first

ICAO

FT

feet

ICAO

FT

filing time

GEN

FT

foot

GEN

FTAR

following transmitted as received (message handling)

GEN

FTHR

farther or further

GEN

FTHRD

feathered

ATC

FTS

Federal Telecommunications System

GEN

FU

smoke

METAR

FURN

furnish

GEN

FV

forward visibility (miles)

ATC

FVFP

filed VFR flight plan

ATC

FW/SIFR

fixed wing special IFR

GEN

FW/SVFR

fixed wing special VFR

GEN

FWA

flight watch area

GEN

FWC

Fleet Weather Central

NWS

FWCS

flight watch control station

GEN

FWD

forward

GEN

FWDC

forward collect

GEN

FWP

flight watch point

GEN

FWRNG

fire warning

GEN

FWS

flight watch specialist

GEN

FWU

flight watch unit

GEN

FYI

for your information

GEN

FZ

supercooled/freezing

METAR

FZDZ

freezing drizzle

METAR

FZFG

freezing fog

METAR

FZRA

freezing rain

METAR

FZRANO

freezing rain sensor not available

METAR

,

G

Contraction

Definition

Usage

G

Green

ICAO

G

gusts reaching (knots) (weather reports only)

NWS

G/A

ground to air

ICAO

G/A/G

ground to air and air to ground

ICAO

GA

general aviation

ICAO

GA

glide angle

GEN

GA

Go ahead, resume sending (to be used in AFS as a procedure signal)

ICAO

GADO

General Aviation District Office

GEN

GALS

gallons

ATC

GBA

give better address

GEN

GBAS

ground-based augmentation system

ICAO

GBL

government bill of lading

GEN

GBR

give better reference

GEN

GC

ground control

GEN

GCA

ground control approach

ICAO 

GCI

ground control intercept

GEN

GCO

ground communication outlet

ATC

GDP

ground delay program

ATC

GDPGM

Ground Delay Program

ATC

GEN

general

GEN

GENOT

general notice

GEN

GEO

geographic

GEN

GEOREF

geographical reference

GEN

GES

ground earth station

ICAO

GHZ

gigahertz

GEN

GIC

GPS Integrity Channel

ATC

GICG

glaze icing

NWS

GLD

glider

ICAO

GLDR

glider

GEN

GLFALSK

Gulf of Alaska

NWS

GLFCAL

Gulf of California

NWS

GLFMEX

Gulf of Mexico

NWS

GLFSTLAWR

Gulf of St. Lawrence

NWS

GLONASS

global navigation satellite system

ICAO

GLONASS

Global orbiting navigation satellite system

ICAO

GLS

GBAS Landing System

ICAO

GMC

Ground movement chart (followed by name/title)

ICAO

GMT

Greenwich Mean Time

GEN

GND

ground

ICAO 

GNDCK

ground check

ICAO

GNDFG

ground fog

NWS

GNSS

global navigation satellite system (in general)

ICAO

GNTR

generator

GEN

GOV

Governor

GEN

GOVT

government

GEN

GP

glide path

ICAO

GPA glide path angle ICAO

GPI

ground point of intercept

ATC

GPS

global positioning system

ICAO

GQA

get quick answer

GEN

GR

hail (greater than 3/4 )

METAR

GRAD

gradient

NWS

GRADU

gradual

ICAO

GRASS

grass landing area

ICAO

GRBL

garble

GEN

GRBNKS

Grand Banks

NWS

GRDL

gradual

NWS

GRID

grid point values of processed meteorological data

ICAO

GRTLKS

Great Lakes

NWS

GRVL

gravel

ICAO 

GS

glide slope

GEN

GS

Ground stop

ATC

GS

Ground speed

ATC

GS

snow pellets/small hail (less than 1/4 )

METAR

GSA

General Services Administration

GEN

GSDO

General Safety District Office

GEN

GSI

General safety inspector

GEN

GSTS

Gusts

NWS

GSTY

gusty

NWS

GTC

gain time control

ATC

GTCL

Great Circle

GEN

GTR

greater

GEN

GUND

Geoid undulation

ICAO

GV

ground visibility

NWS

GVG

giving

GEN

GVH

government vehicle

GEN

GWT

gross weight

GEN

,

H

Contraction

Definition

Usage

H24

continuous 24 hour service

ICAO

HAA

height above airport

GEN

HADA

Hawaiian Defense Area

GEN

HADD

Hawaiian Air Defense Division

GEN

HADIZ

Hawaiian Air Defense Identification Zone

GEN

HAL

height above landing

GEN

HANG

Hawaiian Air National Guard

GEN

HAPI

holding as previously instructed

ATC

HARS

hazardous area reporting service

ATC

HAT

height above touchdown

GEN

HAZ

hazard

GEN

HAZMAT

hazardous material

ICAO

HB

homing beacon

ATC

HBN

hazard beacon

ICAO

HCVIS

high clouds visible

NWS

HDATZ

high density traffic zones

ATC

HDF

high frequency direction finding station

ICAO

HDFRZ

hard freeze

NWS

HDG

heading

ICAO

HDOP

Horizontal Dilution of Precision

ATC

HDSVLY

Hudson Valley

NWS

HDTA

high density traffic airport

GEN

HDWND

headwind

ATC

HEAD

Head of State status

ICAO

HEL

helicopter

ICAO

HELI

heliport

GEN

HF

high frequency

GEN

HFR

hold for release

ATC

HGT

height

ICAO

HHE

household effects

GEN

HI

high

NWS

HIALS

high intensity approach light system

GEN

HIBAL

high altitude balloon

GEN

HIEAT

highest temperature equaled for all time

NWS

HIEFM

highest temperature equaled for the month

NWS

HIESE

highest temperature equaled so early

NWS

HIESL

highest temperature equaled so late

NWS

HIFOR

high level forecast

NWS

HIRIV

how will arrival report be filed concerning

ATC

HIRL

high intensity runway lights

GEN

HITMP

highest temperature

NWS

HIWAS

hazardous inflight weather advisory service

GEN

HIXAT

highest temperature exceeded for all time

NWS

HIXFM

highest temperature exceeded for the month

NWS

HIXSE

highest temperature exceeded so early

NWS

HIXSL

highest temperature exceeded so late

NWS

HJ

sunrise to sunset

ICAO

HLDG

holding

ICAO

HLF

half

GEN

HLP heliport ICAO

HLSTO

hailstones

NWS

HLTP

hilltop

NWS

HN

sunset to sunrise

ICAO

HND

hundred

GEN

HNGR

hangar

GEN

HO

service available to meet operational requirements

ICAO

HOL

holiday

GEN

HOP

handoff point

ATC

HOP

helicopter operations

GEN

HOSP

hospital aircraft

ICAO

HOW

handover word

ATC

HP

holding pattern

GEN

HPA

hectopascal

ICAO

HQ

headquarters

GEN

HR

here

GEN

HR

hour

ICAO

HRZN

horizon

GEN

HS

service available during scheduled operations

ICAO

HTN

heterodyne

GEN

HTR

heater

GEN

HUM

humanitarian mission

ICAO

HURCN

hurricane

ICAO

HUREP

hurricane report

NWS

HV

high voltage

GEN

HVDF

high and very high frequency direction finding stations

ICAO

HVY

heavy

ICAO 

HWVR

however

GEN

HWY

highway

GEN

HX

high index

NWS

HX

no specific working hours

ICAO

HYD

hydraulic

GEN

HYDRO

hydrographic

GEN

HYR

higher

ICAO

HZ

haze

METAR

Hz

hertz

GEN

,

I

Contraction

Definition

Usage

I/IFR

intermittent instruments

ATC

IAARC

International Administrative Aeronautical Radio Conference

GEN

IAATCD

if authorized by ATC, DME may be used

ATC

IAC

instrument approach chart (followed by name/title)

ICAO

IAF

initial approach fix

ICAO

IAO

in and out of clouds

ICAO

IAP

instrument approach procedure

ICAO

IAR

intersection of air routes

ICAO

IAS

indicated air speed

ATC

IATA

International Air Transport Association

GEN

IATSC

International Aeronautical Telecommunications Switching Center

GEN

IAW

in accordance with

GEN

IBASF

intervals between aircraft in stream type formation

ATC

IBN

identification beacon

ICAO

IBND

inbound

ATC

IC

ice crystals (weather reports only)

METAR

IC

icing (PIREP only)

ATC

ICAO

International Civil Aviation Organization

GEN

ICD

Interface Control Document

ATC

ICG

icing

NWS

ICGIC

icing in clouds

NWS

ICGICIP

icing in clouds and precipitation

NWS

ICGIP

icing in precipitation

NWS

ID

identify or identifier

ICAO

IDAT

interfacility data

GEN

IDENT

identification

ICAO

IDP

individual development plan

GEN

IF

intermediate approach fix

ICAO

IF

intermediate fix

GEN

IFAMP

if approach missed proceed

ATC

IFF

identification friend/foe

ICAO

IFHOL

if holding

ATC

IFIM

International Flight Information Manual

GEN

IFINS

if instrument conditions encountered

ATC

IFO

International Field Office

GEN

IFO

interphone

GEN

IFONO

interphone (service F) not operative

GEN

IFORO

interphone (service F) resumed operation

GEN

IFPFP

individual flight plans from this point

ATC

IFR

instrument flight rules

ICAO

IFSS

International Flight Service Station

GEN

IFUN

if unable

GEN

IFVLS

if flight visibility becomes less than

ATC

IFVR

if visibility remains

ATC

IGA

international general aviation

ICAO

IGIA

Interagency Group on International Aviation

GEN

IIA

if incorrect advise

GEN

IISD

if incorrect service direct

GEN

ILAS

instrument low approach

ATC

ILS

instrument landing system

ICAO  

ILSP

ILS partial

GEN

IM

inner marker

ICAO  

IMAP

immediately after passing

ATC

IMC

instrument meteorological conditions

GEN

IMDT

immediate

NWS

IMF

interrogation sign

GEN

IMG

immigration

ICAO

IMI

Intensity unknown (weather reports only)

ICAO

IMP

impracticable

GEN

IMPL

impulse

GEN

IMPR

improve

ICAO

IMPT

important

GEN

IMT

immediate or immediately

GEN

IN

inch

ICAO

INA

initial approach

ICAO

INADQT

inadequate

GEN

INATS

interruption of air traffic services

GEN

INBD

inbound

ICAO

INC

in clouds

ICAO

INC

incorporated

GEN

INCERFA

uncertainty phase code (alerting service)

ATC

INCL

include

GEN

INCLV

inclusive

GEN

INCOMP

incomplete

GEN

INCOR

incorrect

GEN

INCR

increase

GEN

INDC

indicate

GEN

INDEF

indefinite

GEN

INDUS

industrial

GEN

INF

inland navigation facility

GEN

INFO

information

ICAO

INIT

initial training

GEN

INLD

inland

NWS

INOF

if not off

GEN

INOP

inoperative

ICAO

INP

if not possible

GEN

INPR

in progress

ICAO

INREQ

information request

GEN

INS

inertial navigation system

ICAO

INSP

inspect

GEN

INST

instrument

GEN

INSTA

instruments authorized

ATC

INSTA

interstate

GEN

INSTBY

instability

NWS

INSTL

install

GEN

INSTR

instruct

GEN

INSTR

instrument

ICAO

INSUF

insufficient scheduled time available

GEN

INSUF

unable to finish

GEN

INT

intersection

ICAO

INTCNTL

intercontinental

GEN

INTCP

intercept

GEN

INTD

intend

GEN

INTER

intermittent

ICAO

INTFC

interference

GEN

INTL

international

ICAO

INTMD

intermediate

GEN

INTMT

intermittent

GEN

INTNS

intentions

GEN

INTR

interior

NWS

INTRG

interrogator

ICAO

INTRMTRGN

Inter Mountain Region

NWS

INTRP

interrupt

GEN

INTS

intense

NWS

INTSF

intensify or intensifying

ICAO

INTSFY

intensify

NWS

INTST

intensity

ICAO

INTVL

interval

GEN

INTXN

intersection

GEN

INVES

investigate

GEN

INVOF

in the vicinity of

ATC

INVRN

inversion

NWS

INVSTAR

investigate and report

GEN

IOVC

in overcast

NWS

IP

initial point

ATC

IP

instructor pilot

GEN

IP/HHCL

initial point/H hour control line

ATC

IPV

improve

GEN

IR

ice on runway

NWS

IR

IFR military training route

GEN

IRAC

Interdepartmental Radio Advisory Committee

GEN

IRAD

inbound radial

ATC

IREG

irregular

GEN

IRN

Interface Revision Notices

ATC

IS

island

GEN

ISA

international standard atmosphere

ICAO

ISB

independent sideband

ICAO

ISMGR

Island Manager

GEN

ISMLS

interim standard microwave landing system

GEN

ISOL

isolate

GEN

ITCK

issue time check

ATC

ITNRNT

itinerant

GEN

ITRY

itinerary

GEN

ITU

International Telecommunications Union

GEN

IVFRC

in VFR conditions

ATC

,

J

Contraction

Definition

Usage

JAL

jet approach landing charts

GEN

JATO

jet assisted take off

ATC

JAWYS

join airways

ATC

J BAR

jet runway barrier

ATC

JCTN

junction

GEN

JOUR

journeyman

GEN

JP

jet penetration

ATC

JPAP

jet penetration approach

ATC

JTST

jet stream

ICAO

JTSTR

jet stream

NWS

,

K

Contraction

Definition

Usage

K

Cold (air mass)

NWS

KC

kilocycles

GEN

KEPOA

keep this office advised

GEN

KFRST

killing frost

NWS

KG

kilogram

GEN

KHZ

kilohertz

GEN

KM

kilometers

GEN

KMH

kilometers per hour

ICAO

KPA

kilopascal

ICAO

KT

knots

GEN

KW

kilowatt

GEN

,

L

Contraction

Definition

Usage

L

Left

ICAO

L

Locator

ICAO

L

Logistics

GEN

L/MF

low/medium frequency

GEN

LA

low approach

ATC

LAA

local airport advisory

GEN

LAADR

low altitude arrival/departure routing

ATC

LAAS

Local Area Augmentation System

ATC

LAB

laboratory

GEN

LABRDR

labrador

NWS

LABS

leased Service A/B system

ATC

LABS

low altitude bombing system

GEN

LADP

local airport deicing plan

ATC

LAM

logical acknowledgement

ICAO

LAN

inland

ICAO

LARCT

last radio contact

ATC

LAT

latitude

ICAO  

LAWRS

Limited Aviation Weather Reporting Station

GEN

LB

left base

ATC

LB

pounds (weight)

GEN

LC

local control

GEN

LCA

locally

ICAO

LCL

local or locally

GEN

LCT

locate

GEN

LCTMP

little change in temperature

NWS

LD

long distance

GEN

LDA

landing distance available

ICAO

LDA

localizer type directional aid

ATC

LDG

landing

ICAO

LDI

landing direction indicator

ICAO

LDIN

lead in lighting system

GEN

LEN

length

ICAO

LETFO

letter follows

GEN

LF

low frequency

GEN

LFC

laminar flow control

GEN

LFNT

low frequency intersection

GEN

LFR

low frequency radio range

GEN

LFT

lift

NWS

LGRNG

long range

NWS

LGT

light or lighting

ICAO

LGTD

lighted

ICAO

LGWV

long wave

GEN

LICOF

land lines communications facilities

GEN

LIFR

low IFR (weather reports only)

NWS

LIH

light intensity high

ICAO

LIL

light intensity low

ICAO

LIM

light intensity medium

ICAO

LIN

linearity

GEN

LIRL

low intensity runway edge lights

GEN

LK

lake

NWS

LKLY

likely

GEN

LKTYP

like type

ATC

LL

landline

GEN

LLWAS

low level wind shear alert system

GEN

LLWS

low level wind shear

GEN

LLZ

localizer (not associated with ILS)

ICAO

LM

locator middle

ICAO

LMM

compass locator at ILS middle marker

GEN

LMT

limit

GEN

LMT

Local Mean Time

ICAO

LN

line

GEN

LNAV

lateral navigation (from TERPS A1)

GEN

LND

Land

GEN

LNDG

landing

GEN

LO

liaison officer

GEN

LO

outer locator

ICAO

LOA

letter of agreement

GEN

LOC

localizer

ICAO

LOCOR

local coordinator

GEN

LODISNAV

long distance navigation

GEN

LOEAT

lowest temperature equaled for all time

NWS

LOEFM

lowest temperature equaled for the month

NWS

LOESE

lowest temperature equaled so early

NWS

LOESL

lowest temperature equaled so late

NWS

LOM

compass locator at ILS outer marker

GEN

LONG

longitude

ICAO  

LONGL

longitudinal

GEN

LOP

line of position

GEN

LORAC

long range accuracy

GEN

LORAN

long range air navigation system

GEN

LOTMP

lowest temperature

NWS

LOXAT

lowest temperature exceeded for all time

NWS

LOXFM

lowest temperature exceeded for the month

NWS

LOXSE

lowest temperature exceeded so early

NWS

LOXSL

lowest temperature exceeded so late

NWS

LP

left traffic pattern

ATC

LP

linear polarization

ATC

LP

liquid propane

GEN

LP

localizer performance without vertical guidance

GEN

LPV

localizer performance with vertical guidance

ICAO

LR

The last message received by me was .

ICAO

LRA

landing rights airport

GEN

LRCOM

long range VHF/UHF communications

GEN

LRG

large

GEN

LRG

long range

GEN

LRS

lake reporting service

GEN

LS

left side

ATC

LS

The last message sent by me was or last message was

ICAO

LSQ

line squall

ICAO

LSR

loose snow on runway

NWS

LST

Local Standard Time

GEN

LT

turn left after take off

ATC

LTAV

light and variable

GEN

LTD

limited

ICAO

LTF

local training flight

ATC

LTFC

landing traffic

ATC

LTGCA

lightning cloud to air

NWS

LTGCC

lightning cloud to cloud

NWS

LTGCCCG

lightning cloud to cloud, cloud to ground

NWS

LTGCG

lightning cloud to ground

NWS

LTGCW

lightning cloud to water

NWS

LTGIC

lightning in clouds

NWS

LTL

little

GEN

LTLCG

little change

NWS

LTNG

lightning

NWS

LTR

later

GEN

LTR

letter

GEN

LTT

landline teletypewriter

ICAO

LTTR

latter

GEN

LV

leaving

GEN

LV

light and variable

ICAO

LVE

leave or leaving

ICAO

LVG

leaving

ATC

LVL

level

ATC

LVO low visibility operations GEN

LVLOF

level off

ATC

LWR

lower

GEN

LX

low index

NWS

LYR

layer or layered or layers

NWS

,

M

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

ICAO 

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

MBST

microburst

ICAO

MCA

minimum crossing altitude

ICAO

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

ICAO 

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

ICAO

MECH

mechanic

GEN

MED

medical

GEN

MED

medium

GEN

MEDEVAC

medical emergency evacuation

ICAO

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 direction finding 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 direction finding station (same location)

ICAO

MHZ

megahertz

ICAO

MI

manufacturing inspector

GEN

MI

mile

GEN

MI

shallow

METAR

MID

middle

GEN

MID

mid point (related to RVR)

ICAO

MID/ASIA

ICAO Middle East/Asia Region

ATC

MIDIZ

Mid Canada 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

ICAO 

MIMNO

mimeographic notice

GEN

MIN

minute

ICAO 

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 take off

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

ICAO

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, monitored, or monitoring

ICAO

MNTN

maintain

ICAO

MNVR

maneuver

GEN

MOA

memorandum of agreement

GEN

MOA

military operations area

ICAO

MOC

minimum obstacle clearance (required)

ICAO

MOCA

minimum obstruction clearance altitude

ICAO

MOD

moderate

GEN

MOD

modulate or modulation or modulator

GEN

MOGR

moderate or greater

NWS

MON

above mountains

ICAO

MON

Monday

ICAO

MONOK

monitor resumed normal operation

GEN

MONOS

monitor out of service

GEN

MONTR

monitor

NWS

MOPS

Minimum operational performance standards

ICAO

MOPTAR

multi object phase tracking and ranging

GEN

MOREPS

monitor station reports

GEN

MOT

Ministry of Transport (Canada)

GEN

MOTNE

Meteorological Operational Telecommunications Network Europe

ICAO

MOV

move, or moving, or movement

ICAO

MPH

miles per hour

GEN

MPP

Merit Promotion Program

GEN

MPS

meters per second

ICAO

MPVA

maintain a position VFR and advise

ATC

MRA

minimum reception altitude

GEN

MRG

medium range

GEN

MRGL

marginal

NWS

MRKG

marking

GEN

MRM

maintenance returns monitor

GEN

MRNG

morning

NWS

MRP

ATS/MET reporting point

ICAO

MRR

mechanical reliability report

GEN

MRTM

maritime

NWS

MRU

Military Radar Unit

GEN

MS

minus

NWS

MSA

minimum safe/sector altitude

GEN

MSAW

minimum safe altitude warning

GEN

MSG

message

ICAO

MSGCTR

message center

GEN

MSL

mean sea level

ICAO 

MSR

Message (transmission identification) has been misrouted

ICAO

MSSR

Monopulse secondary surveillance radar

ICAO

MSTLY

mostly

NWS

MSTR

moisture

NWS

MT

mountain

ICAO

MTCA

minimum terrain clearance altitude

GEN

MTI

moving target indicator

ATC

MTN

mountain

NWS

MTR

military training route

GEN

MTRL

material

GEN

MTRY

momentary

GEN

MTU

metric units

ICAO

MTW

mountain wave

ICAO

MU

designate a friction value representing runway surface conditions (Greek letter)

GEN

MUA

maximum usable altitude

GEN

MUF

maximum usable frequency

GEN

MULT

multiple

GEN

MUNI

municipal

GEN

MV

millivolt

GEN

MVA

minimum vector altitude

GEN

MVDF

medium and very high frequency direction finding station (same location)

ICAO

MVFR

maintain VFR

ATC

MVFR

marginal VFR

NWS

MVSP

maintain visual separation

ATC

MWO

Meteorological Watch Office

ICAO

MWRC

maintain well to right of course

ATC

MWTCS

modernized weather teletypewriter communications system

GEN

MXD

mixed

NWS

,

N

Contraction

Definition

Usage

N

north or northern latitude

ICAO

N/A

not applicable

GEN

NA

not authorized

GEN

NAAS

Naval Auxiliary Air Station

GEN

NAATS

National Association of Air Traffic Control Specialists

GEN

NAB

not above

GEN

NACOS

national communications schedule

GEN

NADIN

National Airspace Data Interchange Network

GEN

NAF

Naval Air Facility

GEN

NAFEC

National Aviation Facilities Experimental Center

GEN

NANAC

National Aircraft Noise Abatement Council

GEN

NAP

not at present

GEN

NAPRS

National Airspace Performance Reporting System

ATC

NAR

North American Route

GEN

NAR

not according to routine

GEN

NAS

National Airspace System

GEN

NAS

Naval Air Station

GEN

NASA

National Aeronautics and Space Administration

GEN

NASC

National AIS system centre

ICAO

NASEO

National Airways System Engineering office

GEN

NASP

National Airport System Plan

GEN

NAT

North Atlantic

GEN

NAT

not ARTS tracked

ATC

NATCA

National Air Traffic Controllers Association

ATC

NATCAS

Navigation, ATC, and Collision Avoidance System

GEN

NATCC

National Air Transport Coordinating Committee

GEN

NATCOM

National Communications Center

GEN

NATL

national

GEN

NATR

no additional traffic reported

ATC

NATS

noise abatement test system

GEN

NAV

navigation

ICAO  

NAVAID

navigational aid

GEN

NAVLO

Navy Liaison Officer

GEN

NAVREP

Navy Representative to the FAA

GEN

NB

New Brunswick

NWS

NB

northbound

ICAO

NBCAP

national beacon code allocation plan

GEN

NBFR

not before

ICAO

NBND

northbound

GEN

NBRHD

neighborhood

GEN

NC

no change

GEN

NCDC

National Climatic Data Center

GEN

NCE

no change in estimates

ATC

NCS

National Communications System

GEN

NCWX

no change in weather

NWS

NDB

nondirectional radio beacon

ICAO

NDB/DME

NDB and DME (collocated)

GEN

NDBLO

not to descend below

ATC

NE

north east

ICAO

NEB

north eastbound

ICAO

NEC

necessary

GEN

NEF

no further clearance required

ATC

NEG

negative

GEN

NELY

northeasterly (weather reports only)

NWS

NERN

northeastern

NWS

NESS

national environmental satellite service

GEN

NETR

no essential traffic reported

ATC

NEW ENG

New England

NWS

NFDD

National Flight Data Digest