A | Amber |
A/A | Air − to − air |
AAL | Above aerodrome level |
ABM | Abeam |
ABN | Aerodrome beacon |
ABT | About |
ABV | Above |
AC | Altocumulus |
ACAS | Airborne Collision Avoidance System |
ACC | Area control centre or area control |
ACCID | Notification of an aircraft accident |
ACFT | Aircraft |
ACK | Acknowledge |
ACL | Altimeter check location |
ACN | Aircraft classification number |
ACP | Acceptance (message type designator) |
ACT | Active or activated or activity |
AD | Aerodrome |
ADA | Advisory area |
ADC | Aerodrome chart |
ADDN | Addition or additional |
ADF | Automatic direction−finding equipment |
ADIZ | Air defence identification zone (to be pronounced “AY − DIZ”) |
ADJ | Adjacent |
ADR | Advisory route |
ADS | Automatic dependent surveillance |
ADSU | Automatic dependent surveillance unit |
ADVS | Advisory service |
AES | Aircraft earth station |
AFIL | Flight plan filed in the air |
AFI | Africa − Indian Ocean |
AFIS | Aerodrome flight information service |
AFM | Yes or affirm or affirmative or that is correct |
AFS | Aeronautical fixed service |
AFTN | Aeronautical fixed telecommunication network |
A/G | Air−to−ground |
AGA | Aerodromes, air routes and ground aids |
AGL | Above ground level |
AGMC | Aerodrome ground movement chart |
AIC | Aeronautical information circular |
AIP | Aeronautical information publication |
AIRAC | Aeronautical information regulation and control |
AIREP | Air−report |
AIRMET | Information concerning en−route weather phenomena which may affect the safety of low−level aircraft operations |
AIS | Aeronautical information services |
ALA | Alighting area |
ALERFA | Alert phase |
ALR | Alerting (message type designator) |
ALRS | Alerting service |
ALS | Approach lighting system |
ALT | Altitude |
ALTN | Alternate or alternating (light alternates in colour) |
ALTN | Alternate (aerodrome) |
AMA | Area minimum altitude |
AMC | Airspace management cell |
AMD | Amend or amended (used to indicate amended meteorological message |
AMDT | Amendment (AIP amendment) |
AMS | Aeronautical mobile service |
AMSL | Above mean sea level |
ANC | Aeronautical chart − 1:500 000 (followed by name/title) |
AO | Aircraft operator |
AOC | Aerodrome obstacle chart (folloved by name/title) |
AP | Airport |
APCH | Approach |
APDC | Aircraft parking/docking chart (folloved by name/title) |
APN | Apron |
APP | Approach control office or approach control or approach control service |
APR | April |
APRX | Approximate or approximately |
APV | Approve or approved or approval |
APT | Receiver for satellite cloud pictures |
ARFOR | Area forecast (in aeronautical meteorological code) |
ARO | Air traffic services reporting office |
ARP | Aerodrome reference point |
ARP | Air−report (message type designator) |
ARR | Arrival (message type designator) |
ARR | Arrive or Arrival |
ARS | Special air−report (message type designator) |
AS | Altostratus |
ASC | Ascend to or ascending to |
ASDA | Accelerate−stop distance available |
ASM | Airspace management |
ASPH | Asphalt |
AT... | At (followed by time at which weather change forecast to occur) |
ATA | Actual time of arrival |
ATC | Air traffic control (in general) |
ATD | Actual time of departure |
ATFM | Air traffic flow management |
ATIS | Automatic terminal information service |
ATM | Air traffic management |
ATN | Aeronautical telecommunication network |
ATS | Air traffic services |
ATTN | Attention |
ATZ | Aerodrome traffic zone |
AUG | August |
AUP | Airspace use plan |
AUTH | Authorized or authorization |
AUW | All up weight |
AUX | Auxiliary |
AVASIS | Abbreviated visual approach slope indicator system |
AVBL | Available or availability |
AVG | Average |
AVGAS | Aviation gasoline |
AWY | Airway |
AZM | Azimuth |