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georgetyrrell

Quick ILS freq question

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Hello all,Have a niggler that I've been trying to find out about, basically where does the ils freq of a rwy at an airport come from? My understanding is that the freq used is taken by the navdata from the a/c, in my case I'm using flight1's ATR, so we'll say if I'm inbound ils rwy 28 at EIDW then the freq I put into the afds will be the freq listed in the navdata of the atr in this case 111.350. Obviously the default freq (in this case rwy 28 EIDW is 108.9 i think) is overrided by the fms data of the a/c? However what if the airport is an addon airport? Do addon airports dictate the freq or is it always the a/c?. Anyone make it clearer?George

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It's coded into the scenery .bgl file. If you have an airport add-on, it's possible for that add-on to exclude the original navaid data and substitute its own. AFCAD files often do this, for example.The data coded into the aircraft's navdata is generally used for auto-tuning frequencies. It would be possible for the panel to synthesize a nav display using an internal database, but I don't know of any that actually do this, as it would not necessarily line up with the scenery in use.RegardsBob ScottATP IMEL Gulfstream II-III-IV-VSantiago de Chile

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