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Pilots may request changes to flight levels ascent icoa descent via data link or clearance direct to a point on their route. An aircraft should normally communicate with the air-ground control radio station that exercises control in the area in which it is flying. Use of such a free-text message will result in an error response.
Uplink messages will be formatted according to the line width indicated by the value of the avionics indicator contained in the down-linked request. 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 WILCO.
The services are provided in accordance with the provisions contained in the following ICAO documents:. Internet text service registration required: ANA is responsible for the provision of radio navigation and surveillance services within the territory of Luxembourg.
Dov inquiries shall be made on the frequency. According to the judgement of the direction-finding station, bearings are classified as follows:. Pilots should check the Flight-ID to ensure that the correct message was received before executing the uplink message.
Belgocontrol is responsible for the provision of radio navigation and surveillance services within the territory of Belgium. Pilots may receive the uplink messages described via data link.
There are variations between aircraft types in implementation of the message latency monitor function: 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.
The system operates in do with specifications AEEC and Full details are given in GEN 3. The messages to be transmitted over the AFS are eoc only if:. The aeronautical stations voc a continuous watch on their stated frequencies during the published hours of service unless otherwise notified.
A ‘Check Stuck Microphone’ instruction may be sent by ATC in circumstances where an aircraft is inadvertently blocking a voice communication channel. If the downlink request is cut off because the time limit was exceeded, the pilot should also repeat the request via radiotelephony.
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. Due to low end-to-end integrity, no flight profile change messages will be sent, e. When a crew receives a CPDLC uplink message with an indication that the message has been delayed the crew shall:.
For the preferential language to be used on non-controlled aerodromes and heliports, see AD 2 and AD 3.
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. Some avionics will automatically set the delay value in accordance with the uplink message and do not iczo for a manual input. Full details are given in the relevant AD 2.
The services are provided in accordance with the xoc contained in the following ICAO documents: There are variations between aircraft types in implementation of iccao message latency monitor function:. A clearance requested via radiotelephony should also be issued via radiotelephony.
Nevertheless, as in radiotelephony, it is of paramount importance that the CPDLC messages shall be answered with the least possible delay. ANA is responsible for the provision of voice and data communication services within the area of responsibility of its air traffic services see GEN 3. Data link capability is displayed on the screens at Maastricht and the controllers will request appropriately equipped aircraft to LOG ON.
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Belgocontrol ifao responsible for the provision of voice and data communications services within the area of responsibility of its air traffic services see GEN 3. Direction-finding stations have authority to refuse to give bearings or headings to steer when icaoo are unsatisfactory or when bearings do not fall within the calibrated limits of the station, stating the reason at the time of refusal.
Contact for operational questions:. The following types of radio aids for navigation are available:. 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.
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 does not relate to the RTF channel being used, no further action by the pilot is required. Only if the controller is asking explicitly for a voice read back, the following phrase should be used by the pilot: If uncertainty arises regarding a data link message, voice communication shall be used.
When a crew receives a Icoa uplink message with an indication that the message has been delayed the crew shall: CPDLC shall only be used for non time critical requests, i. In case of an uplink message time-out, ATC will acknowledge receipt of the uplink message via voice communication.
The CPDLC application provides a means of communication between the air traffic controller and the pilot, using a predefined data link message set. It is then up to dov pilot to act appropriate. If the pilot is unable to comply with this data link instruction, he shall revert to voice communication to inform ATC.
This improves safety in air traffic during VHF frequency interference and failures, adverse weather and traffic congestion. Pilots shall respond to all uplink clearances and instructions with the appropriate data link operational ocao, before manoeuvre execution.
Free dial-in voice service: The crew will be required to disconnect from the data link service, and not allowed to re-LOG-ON to the current data authority. 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. Formatting of the up-linked information takes iicao account pre-defined rules intended to enhance the readability of the messages.