Glossary of Terms

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AIRMET information. Information issued by a meteorological watch office concerning the occurrence or expected
occurrence of specified en-route weather phenomena which may affect the safety of low-level aircraft operations and
which was not already included in the forecast issued for low-level flights in the flight information region concerned or
sub-area thereof.


AIRPROX. The code word used in an air traffic incident
report to designate aircraft proximity.


A power-driven lighter-than-air aircraft.


Airside. The movement area of an airport, adjacent terrain and buildings or portions thereof, access to which is controlled.


Airway. A control area or portion thereof established in the form of a corridor.

AIS product

AIS product. Aeronautical information provided in the form of the elements of the Integrated Aeronautical Information
Package (except NOTAM and PIB), including aeronautical charts, or in the form of suitable electronic media.


ALERFA. The code word used to designate an alert phase.

Alerting service. A service provided to notify appropriate organizations regarding aircraft in need of search and rescue aid,
and assist such organizations as required.

Alert phase. A situation wherein apprehension exists as to the safety of an aircraft and its occupants.

Alerting post

Alerting post. Any facility intended to serve as an
intermediary between a person reporting an emergency and
a rescue coordination centre or rescue subcentre.

Alerting service

“alerting service” means a service provided by the appropriate ATS authority to notify
appropriate organisations regarding aircraft in need of search and rescue aid and to assist
such organisations as required.


ALSF-1:   Approach Lighting System with Sequenced Flashing Lights configuration 1

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