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Flight crews can expect to receive uplinks especially during periods of high traffic volume, and are requested to always confirm them as soon as possible with Dic. The services are provided in accordance with the provisions contained in the following ICAO documents:. Contact for operational questions:. A continuous update sequence is generated for a contract C request and ended by a terminate T request, or else automatically timed out after 1 hour.
The aeronautical stations maintain a continuous watch on their stated frequencies during the published hours of service unless otherwise notified. Nevertheless, as in radiotelephony, it is of paramount importance that the CPDLC messages shall be answered with the least possible delay. It is then up to iccao pilot to act appropriate. Aircraft should maintain continuous watch on the appropriate frequencies of the control station and should not abandon watch, except in an emergency, without informing the control station.
Pilots shall respond to all uplink clearances and instructions with the appropriate data link operational response, before manoeuvre execution. Only if the controller is asking explicitly for a voice read back, the following phrase should ucao used ica the pilot: Pilots may receive the uplink messages described via data link.
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Data link capability is displayed on the screens at Maastricht and the controllers will request appropriately equipped aircraft to LOG ON. The system operates in accordance with specifications AEEC and Belgocontrol is responsible for the provision of voice and data communications services within the area of responsibility of its air traffic services see GEN 3. Pilots may request changes to flight levels ascent or descent via data link or clearance direct to a point on their route.
Due to low end-to-end integrity, no flight profile change messages will be sent, e. According to the judgement of the direction-finding station, bearings are classified as follows:.
If the downlink request is cut off because the time limit was exceeded, the pilot should also repeat the request via radiotelephony. The CPDLC application provides a means of communication between the air traffic controller and the pilot, using a predefined data link message set. Revert to voice communications to notify the ATS unit of the delayed message received and to request clarification of the intent of the CPDLC message, and; Respond appropriately to close the message as per instructions of the controller; The pilot must not act on the delayed uplink message until clarification has been received from the controller.
Direction-finding stations have authority to refuse to give bearings or headings to steer when conditions are unsatisfactory or when bearings do not fall within the calibrated limits of the station, stating the reason at the time of refusal.
CPDLC shall only be used for non time critical requests, i.
Internet text service registration required: The crew will be required to disconnect from the data link service, and not allowed to re-LOG-ON to the current data authority. Belgocontrol is responsible for the provision of radio navigation and surveillance services within the territory of Belgium. If the ‘Check Stuck Microphone’ instruction does not relate to the RTF channel being used, no further action by the pilot is required.
In case of an odc message time-out, ATC will acknowledge receipt of the uplink message via voice communication. The following types of radio aids for navigation are available:. For the preferential language dof be used on non-controlled aerodromes and heliports, see AD 2 and AD 3. Uplink messages will be formatted according to the line width indicated by the value of the dov indicator contained in the down-linked request.
Free dial-in voice service: Message content should not differ from the airborne content voice and textbut a small synchronisation lag may be noticed. If the ‘Check Stuck Microphone’ instruction relates to the RTF channel currently being used, the pilot shall check that the radio equipment is not causing the blockage. Some avionics will automatically set the delay value in accordance with the uplink message and do not allow for a manual input.
In case of a scheduled shutdown or an unexpected failure of the CPDLC system, ATC will instruct all aircraft equipped with data link to return to voice communication. The services are provided in accordance with the provisions contained in the following ICAO documents: There are variations between aircraft types in implementation of the message latency monitor function:.
ANA is responsible for the provision of radio navigation and surveillance services within the territory of Luxembourg.
QNE – Q Code – Doc ICAO – PPRuNe Forums
Formatting of the up-linked information takes into account pre-defined rules intended to enhance the readability of the messages. Pilots should check the Flight-ID to ensure that the correct message was received before executing the uplink message.
A ‘Check Stuck Microphone’ instruction may be sent by ATC in circumstances where an aircraft is inadvertently blocking a voice communication channel. When a crew receives a CPDLC uplink message with an indication that the message has been delayed the crew shall: An aircraft should normally communicate with the air-ground icso radio station that exercises control in the area in which it is flying.
If uncertainty arises regarding a data link message, voice iczo shall be used.
QNE – Q Code – Doc 8400 ICAO
If the pilot is unable to comply with this data link instruction, he shall revert to voice communication to inform ATC. Xoc clearance requested via radiotelephony should also be issued via radiotelephony. Full details are given in the relevant AD 2.