Home >Air Traffic Control Safety
Functions of Various Air Traffic Control Equipment / Facilities for the HKIA
ATMS processes the flight plan and surveillance data from various surveillance signal input sources, including primary and secondary surveillance radars as well as ADS-B system, to present details of the aircraft information (e.g. aircraft position, altitude, callsign, ground speed, aircraft category, etc.) on the screen of air traffic control working positions to facilitate the management of air traffic by the air traffic control officers.
ATSDMS includes (i) an enhanced Air Traffic Control Data Network, which is the communications backbone for all new ATC systems and (ii) an Operational Information Database System, which provides an integrated operational displays for real-time air traffic services information.
AIMS is an information management system used for the generation, distribution and storage of Notices to Airmen, as well as management of flight plans and other aeronautical information for use by air traffic flight services officers and pilots.
AMS consists of two major components - Aeronautical Telecommunications Network (ATN) Router System and Regional Operational Meteorological Bulletin Exchange (ROBEX) System.
The ATN Router System supports the exchange of air traffic services messages among the Air Traffic Services Message Handling Systems (AMHS) in Hong Kong and the adjacent Communications (COM) Centre, while the ROBEX System is for storing meteorological messages and disseminating them to the neighbouring Communications (COM) Centre in the Asia Pacific Region.
CB is a communication network consisting of Synchronous Digital Hierarchy rings and Microwave links interconnecting the communication, navigation, surveillance and air traffic management systems located in the CAD Air Traffic Control Building/Tower and outstations in various areas of Hong Kong.
VCSS is a computerised voice communication system for direct communication between pilots and air traffic control officers, and between air traffic control working positions in the ATC Centre, ATC Tower and Rescue Coordination Centre, by using pre-set aeronautical frequencies, direct communication lines and telephone lines.
DRS is used for 24-hour recording of the air/ground radio and telephone communication channels between ATC Centre/ATC Tower and other external organisations. The recordings are essential for incident/accident investigation and training of air traffic control officers.
ATIS is a VHF broadcasting system for continuous dissemination of vital information (e.g. updated airfield, meteorological and navigational aids serviceability information, etc.) to flights departing from or arriving at HKIA. Public can also gain access to the information at telephone no. 3141 2820 and 3141 2705.
AVBS is used to automatically broadcast at regular intervals the pre-recorded meteorological information for various airports including Hong Kong and the neighbouring aerodromes (e.g. Guangzhou, Naha, Taipei, etc.).
AMHS is a ground-to-ground communication system for supporting air traffic services message exchange among Hong Kong and overseas ATC centres, enabling timely and reliable dissemination of aeronautical information over Aeronautical Telecommunications Network and Aeronautical Fixed Telecommunication Network to secure flight safety and efficiency.
and provides both the range and bearing information of an aircraft
within its effective coverage by radio wave reflection. Depending on the operational need and external environmental conditions,
the coverage may reach 80NM for approach control or
200NM for en-route control purpose.
A short range PSR is installed at Sha Chau to detect aircraft
operating within the approach and departure areas of the
after processing, the range, bearing, altitude and callsign of an aircraft. Depending on the operational need and external environmental conditions, the coverage may reach 250NM.
It can provide more useful information than PSR but is
subject to the proper functioning of the aircraft's transponder.
To provide the best accuracy
of aircraft position, it is usually paired with a PSR
for air traffic control purpose.
A-SMGCS employs both the multilateration and Automatic Dependent Surveillance-Broadcast (ADS-B) technologies for enhanced surveillance of aircraft and vehicle movement in the airfield, and provision of conflict and runway incursion alerting functions for improved flight safety and efficiency.
ADS-B System receives and processes the messages broadcasted from aircraft, covering the aircraft identification, position, altitude, air speed, and heading, etc.
SMR is mounted on the top of South ATC Tower for surveillance of aircraft and vehicles on the runways and taxiways. The accurate information provided enables the air traffic control officers to maintain a smooth flow of traffic during low visibility conditions.
Radar Simulator (SIM) System is a replica of the ATMS and is used for the training of air traffic control officers as well as the evaluation of air traffic control procedures.
CTS uses the advanced imaging technology to simulate the airport environment, including day or night, good or bad weather conditions, and aircraft emergencies. It is an effective tool for the training of air traffic control officers.
ILS provides accurate azimuth and descent guidance signals for use by aircraft landing on the runway under normal or adverse weather conditions. The equipment serving both approach directions of the south runway has been certified for Category II operation with a decision height of 15m. For the north runway, similar Category II ILS is installed for aircraft approaching from the southwest while Category III ILS, which supports blind landing from northeast direction, has also been provided.
Doppler Very High Frequency Omni-directional Radio Range and Distance Measuring Equipment (DVOR/DME)
DVOR/DME provides bearing and distance information to aircraft, and to define air traffic control routes for en-route, terminal and instrument approach/departure procedures. They are installed at Tung Lung. Cheung Chau, Lung Kwu Chau and Siu Mo To to support departure and missed approach flight paths of the HKIA.
This includes the radio and signal transmitters and receivers operating on various frequencies used for both the long-range and short-range air/ground communications with aircraft. They are installed at Cape D'Aguilar, Mount Butler, Victoria Peak, Tai Mo Shan, North Lantau, Mount Parker, Beacon Hill, and on-airport sites.
NDB is installed at the southwest end of the runway promontory to provide additional track guidance to aircraft departing from the runway.
MLS conveys radar and air/ground communication signals, equipment status and remote control signals between various CAD radars, navigational aids and communication stations, the ATC Centre, ATC Tower and Watchkeeping Control Centre.
MCS sets the time standard according to the time reference derived from the Global Positioning System and Hong Kong Observatory. It is also used to synchronise the time among various ATC systems of the HKIA, as well as to display standard time for air traffic control purpose.