Path terminator encoding for specific approach chart

Stelios Adamantidis
  • Path terminator encoding for specific approach chart Stelios Adamantidis

    I am building my own ATC simulator and for that purpose I need to include several instrument procedures. I have a problem with that particular one:

    AD2-LGAV-IAC-10 AIP

    My problem is on KEA transition, the leg between "RDL 256 KEA" and "RDL 192 ATV" how should the transition be encoded in terms of ARINC-424 path terminator sequences.

    Specifically it's the turn from the one leg to the other that bothers me: "RDL 256 KEA" seems to terminate on either 27 DME KEA or RDL 187 ATV. But then what? There is a 20 DME ATV on the next leg that spoils everything. CD (or Course to DME) is not a specific route over the ground so the previous turn won't be able to intercept it. I could either omit the CD part or insert another CR (course to radial) before the CD leg but then I'm not doing what the map says, I improvise. So my question is am I conceiving this wrong, or the IAC is ambiguous in this particular point?

  • So you fly the KEA transition like this:

    • Track RDL 265 KEA until crossing RDL 187 ATV or 27 DME KEA
    • Start a right turn and intercept RDL 192 ATV
    • Fly RDL192 until intercepting final

    As egid said, RDL 187 ATV is a lead radial which is a radial used only to tell you when to start a turn.

    As far as 20 DME ATV, it is actually only used for the PELAG transition so you can ignore it in this case.

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