The PFD as the plane turned into finals showed SP, LNAV and VPATH. The plane flew over the airport at 2000 ft. Again no response on trying to lock onto the glide slope. On the second try, altitude was set at 2000 ft for final leg. On the first occasion the altitude was dialled in at 0, and the plane descended to the strip, but never locked onto the glide slope. After turning onto finals, at 20 DME I tried to activate LOC and then APP, and also later closer to touchdown. The plane followed the route all the way to the airport. Today I have been through the tutorial flight twice more, following it word for word. Thanks for the replies.I had been through the tutorial prior to posting. Note: There are several ways to discover if the runway of your choice has an ILS and/or GS. Some valid ILS transmitters do not have a GS. At most locations, the upper range is about 21.5 miles, but can be as low as 19 miles.Ĥ) You have not tuned the Nav radio 1 to the ILS frequency of the runway you chose. 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.

Pmdg 777 landing altitude