(d) 500 kHz an international calling and distress frequency for aircraft on flights over the high seas. (c) 457 kHz is an authorized working frequency for flights over the high seas. (b) 410 kHz is the international direction-finding frequency for use outside the continental United States. Aircraft stations may use frequencies assigned to Government or non-Government aeronautical stations or radionavigation land stations if the communications are within the aeronautical or radionavigation land station scope of service. 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.(a) Frequencies used for air-ground Communications are listed in subpart E. Note 2:ğor EBBR a separate ATIS message is provided for arrival (A) or departure (D) requests for EBAW, EBCI, EBLG and EBOS, a combined ATIS message is provided for arrival (A) or departure (D) requests. Note 1:Ě single VOLMET message is provided for en-route (E) requests associated with EBAW, EBBR, EBCI, EBLG or EBOS. Formatting of the up-linked information takes into account pre-defined rules intended to enhance the readability of the messages. Uplink messages will be formatted according to the line width indicated by the value of the avionics indicator contained in the down-linked request. Aircraft can interface with the service through the SITA and ARINC service providers’ networks where available to aircraft. The system operates in accordance with specifications AEEC 622 and 623. The information provided is identical with the information provided through broadcasting (see § 3.3 above). If the downlink request is cut off because the time limit was exceeded, the pilot should also repeat the request via radiotelephony.ĭigital VOLMET ( D-VOLMET) and digital ATIS ( D-ATIS) are available H24 via data link. Nevertheless, as in radiotelephony, it is of paramount importance that the CPDLC messages shall be answered with the least possible delay. requests that do not require the immediate reaction of the controller. CPDLC shall only be used for non time critical requests, i.e. When using CPDLC, the maximum dialogue time is 120 SEC. The following downlink requests may be sent by pilots using CPDLC with Maastricht UAC: Pilots shall respond to all uplink clearances and instructions with the appropriate data link operational response, before manoeuvre execution.
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