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ICAI ILS minimums and back beam approach indications

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  • ICAI ILS minimums and back beam approach indications

    Dear colleagues,

    I have a few questions I hope you can help me with. See attached pictures for clarification.
    - on page 20 the indicator gives the indication you would expect to get on the normal approch. However, the discription says that if you turn it 180 degrees, indication should be correct. Is the image just wrong, or do I misunderstand?
    - page 21 says that the EASA table is on the previous page. It is not. There is some sort of table on the right side, but that does not correspond to the numbers given in the text. Is that because it is produced by the (unknown to me) ICAI institute?
    - if i compare the table to the table I found in a radio navigation ATPL book, the numbers also dont correspond to the jeppesen table. What goes wrong?

    Many thanks in advance!
    Attached Files
    Last edited by Catharine; 31-07-2019, 21:23.

  • #2
    Thanks for all the replies! Really helped me out


    • #3
      But seriously.. anyone who know any of the answers?


      • #4
        Hi Catherine,

        Back Course ILS
        Recall the the ILS transmits two lobes, the right hand at 150 Hz and the left hand at 90 Hz. When you fly a back course the lobes are reversed as shown in the diagram, this means the indications are reversed as well. There are techniques to get around this, on modern aircraft you simply push a button marked BC for Back Course and the system automatically makes the indications correct for you.

        Cat 3B ILS ICAO and EASA have set different limits for the RVR. ICAO 50m and EASA 75m. The Radio exam uses EASA figures so 75m.


        • #5
          Many thanks for your reply! 😃