This one is not likely because your APP mode is not available.ģ) You are activating the APP mode while too far away and outside the range of the GS.īy default, FS will go into ILS mode only and will not track a valid GS (even if it is available) if APP mode is activated outside the range where the GS needle appears. This will prevent the AP from tracking the GS. This seems the most likely reason you cannot activate APP mode.Ģ) You are above the GS when you activate APP mode. The FMS is just following the programmed descent profile for the conditions (airport, terrain, runway, weather and altitude) according to the onboard approach charts for the airport. ![]() ![]() Common reasons why you cannot track the ILS glideslope:ġ) There's isn't one for the runway you have selected.
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