曝光臺 注意防騙 網曝天貓店富美金盛家居專營店坑蒙拐騙欺詐消費者

2001. This paper reports the development in these two areas.
2. Downlink
2.1 Trials with Automatic Dependent Surveillance (ADS) and Controller-Pilot Data Link
Communications (CPDLC) datalinks for automatic weather reporting from B747 aircraft were
conducted by Hong Kong, China in 2000 over the South China Sea. Results of these trials were
previously reported in CNS/MET SG5. Further ADS trials with B777 and Airbus aircraft were
conducted in early 2002. During these further trials, 57 in-flight weather reports from B777 aircraft
and 18 reports from Airbus aircraft were received and analysed by the Hong Kong Observatory
(HKO).
2.2 Analysis of the B777 ADS data received in the 2002 trial revealed rather large
deficiencies in the wind direction in the reports. The same had previously been noted by the Fifth
ICAO Meteorological Information Data Link Study Group meeting (METLINKSG/5) in 2000. The
manufacturer released a software upgrade in late 2001 for installation on-board the aircraft to rectify
the problem. The airline participating in the B777 trial was advised of the availability of the software
upgrade.
2.3 For the Airbus trial, no abnormal wind reports were found. All temperature reports
received from the B777 and Airbus aircraft during the trials were found to be of acceptable quality.
2.4 With the digital aeronautical telecommunication network still under development,
automatic weather reporting has to be carried out through FANS-1/A systems (FANS: Future Air
Navigation System) and airline company datalinks. Under the tight operating environment currently
experienced by the aviation industry, airlines have expressed concern over the additional
telecommunication charges incurred by these datalink trials. The prospect of airlines’ participation in
future large-scale trials is uncertain and an alternative datalink has to be identified.
CNS/MET SG/6 – IP/13
2
2.5 The SSR Mode-S datalink has been considered as an alternative for weather
reporting. The ICAO Manual on Mode S Specific Services (Doc 9688) specifies the formats for
meteorological routine air reports and meteorological hazard reports. Unlike weather reporting using
ADS or CPDLC based on FANS-1/A system, there is no extra cost for using the Mode-S datalink.
Hong Kong, China is exploring the use of such alternative datalink for weather reporting and is
working on possible trials with small aircraft.
3. Uplink
3.1 In respect of uplink of OPMET information, Hong Kong, China introduced the
Datalink Automatic Terminal Information Service (D-ATIS) and Datalink VOLMET service (DVOLMET)
in 2001. Aircraft equipped with suitable datalink capabilities can request full scripts of
the ATIS and VOLMET messages and have them printed inside the cockpit. These datalink services
are operated in parallel with the voice ATIS and VOLMET broadcast. Compared with the voice
services, the datalink services enable pilots to more efficiently acquire the latest runway weather
conditions at the Hong Kong International Airport and OPMET information of Hong Kong, China as
well as weather information at a number of nearby international airports.
4. Action
4.1 The meeting is invited to note the information contained in this document.
- - - - - - - -
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COMPANY PROFILE
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