Menu text transmissions are scripted nontrajectory altering uplink messages. Transfer of communications automatically establishes data link contact with a succeeding sector. When an IC mismatch or Confirm Assigned Altitude (CAA) downlink time-out indicator is displayed in the Full Data Block (FDB) and Aircraft List ( ACL), the controller who has track control of the aircraft must use voice communication to verify the assigned altitude of the aircraft, and acknowledge the IC mismatch/time-out indicator. Initial contact is a safety validation transaction that compares a pilot's initiated altitude downlink message with an aircraft's stored altitude in the ATC automation system. CPDLC issued altimeter settings are excluded for this purpose. When conducting instrument approach procedures, pilots are responsible to obtain and use the appropriate altimeter setting in accordance with 14 CFR Section 97.20. A controller may also manually send an altimeter setting message. Altimeter settings will also be uplinked automatically when an aircraft receives an uplinked altitude assignment below FL 180. Participating aircraft will need to have the appropriate CPDLC avionics equipment in order to receive uplink or transmit downlink messages.Įn Route CPDLC Initial Services offer the following services: Altimeter Setting (AS), Transfer of Communications (TOC), Initial Contact (IC), and limited route assignments, including airborne reroutes (ABRR), limited altitude assignments, and emergency messages.Īltimeter settings will be uplinked automatically when appropriate after a Monitor TOC. Voice remains the primary and controlling air/ground communications means. The CPDLC's principal operating criteria are:
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As a flight progresses from one sector to another, the pilot is requested to change to the appropriate sector discrete frequency.Ĭontroller Pilot Data Link Communications ( CPDLC) is a system that supplements air/ground voice communications. Each sector is handled by one or a team of controllers and has its own sector discrete frequency. Flight plan filing, en route weather, weather forecasts, and similar data should be requested through FSSs, company radio, or appropriate military facilities capable of performing these services.Īn ARTCC is divided into sectors. Since IFR operations are expedited through the use of direct communications, pilots are requested to use these frequencies strictly for communications pertinent to the control of IFR aircraft. Although they may be several hundred miles away from the ARTCC, they are remoted to the various ARTCCs by land lines or microwave links. These sites are located throughout the U.S. Maximum communications coverage is possible through the use of Remote Center Air/Ground ( RCAG) sites comprised of both VHF and UHF transmitters and receivers.
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Cold Temperature Barometric Altimeter Errors, Setting Procedures and Cold Temperature Airports (CTA).Barometric Altimeter Errors and Setting Procedures.Aircraft Rescue and Fire Fighting Communications.National Security and Interception Procedures.Pilot/Controller Roles and Responsibilities.Operational Policy/Procedures for the Gulf of Mexico 50 NM Lateral Separation Initiative.Operational Policy/Procedures for Reduced Vertical Separation Minimum (RVSM) in the Domestic U.S., Alaska, Offshore Airspace and the San Juan FIR.Radio Communications Phraseology and Techniques.Air Navigation and Obstruction Lighting.Aeronautical Lighting and Other Airport Visual Aids.Performance-Based Navigation (PBN) and Area Navigation (RNAV).Code of Federal Regulations and Advisory Circulars.