In FS2002 I'm recently missing the Inner Marker tone and panel light. Outer & Middle Marker tones & lights are fine. On panels with a marker test function, all three lights and tones work. FS2002 Sound File contains all three WAV files and they work OK. Audio panel has "mkr" enabled. This is strange; It's almost as if the approach "trigger" function is not activating the IM, but is the MM & OM. This is occuring on all ac, default & third party (300 and counting) and at all airports. I have no scenery additions. Any help will be appreciated. Thank you. Mistral2

In the MSFS world (I can't speak for the real world), not every airport has an inner marker. I don't know if it is related to the category of ILS approach or not, but your issue is pretty common in my experience. Try some approaches in and out of O'Hare, and the IM should fire on at least some of the runways.-John

Yup, true in the real world as well. IMs are generally only installed on Category III (and possibly II) ILS runways, and those are fairly uncommon compared to the much more common Category I (200 ft ceiling and 1/2 mile vis).

Thank You JohnCi and DNelson,You guys sure nailed this one. Flew approaches at KORD and KSFO and, as you said, some runways trigger the IM and some don't; more commonly not. Appreciate your help.mistral2