Nav Aids 23

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  1. What are the 3 major components of the ACARS datalink system?
    • A/C equipment,
    • datalink service provider
    • Ground processing system
  2. What is the function of the A/C equipment component of ACARS?
    To sedn and recieve digital messages to and from the ground stations.
  3. What does ACARS use as the primary transmission and reception media?
  4. What does ACARS use as the transmission and reception media when out of VHF range?
    ACARS automatically reverts to SATCOM
  5. What is the role of the Datalink service provider (DSP)
    To deliver a message from an A/C to the ground processing system, and vice versa.
  6. When is HF used as the transmission medium for ACARS?
    In Polar regions where SATCOM coverage is unreliable
  7. What is the acronym for the datalink application that allows for the direct exchange of text based messages between air traffic control and flight crew?
  8. What is the host unit that facilitates CPDLC?
  9. Does the termination of dialogue between an aircraft and ATC mean the CPDLC link is terminated?
    No not necessarily
  10. What type of communications does the SATCOM provide the crew of long haul A/C
    Both voice and datalink communications.
  11. Where do the SATCOM satelllites send data?
    To one of the SITA Ground Earth Stations (GES)
  12. What are the 2 principal applications which interface with ACARS?
    CPDLC (ATC) and AOC/ACC applications.
  13. What are OOOI events?
    The automatic detection and reporting of major flight phases. Out of the gate. Off the ground. On the ground. On the ground and In the gate.
  14. What is the basis of Controller Pilot Data Link Communications (CPDLC)
    A set of clearance/information/request message elements in pre-defined formats.
  15. What format protocols are required for position reports sent via CPDLC?
    The same as for voice position reports
  16. Does CPDLC provide the flight crew with the capability to declare an emergency?
  17. what type of communications does CPDLC provide the crew of long haul aircraft?
    Air-Ground data communication for ATS.
  18. How are phone numbers entered into SATCOM?
    directories pre defined by the Airline. or if they allow. manually.
  19. Can A/C receieve incoming SATCOM calls?
  20. is CPDLC limited to being used in conjunction with ADS-C?
    no, CPDLc can be used as a stand alone application.
  21. When out of VHF range, how does a satellite shadow area affect SATCOM capability?
    May lead to loss of SATCOM capability
  22. Does SATCOM provide data or voice communications?
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Nav Aids 23
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