Lots of very good points, but what on earth is the FM Immunity puzzle ?
Next to the glass on the 757 and 767 I fly is a warning that the ILS may not be FM Immune. I remember some years ago a discussion in 'Pilot' about it - large costs, massive replacement of avionics for light a/c pilots etc etc...
I'm not up to speed with the current legislation - just wondered if I can fly with my non-immune kit, why can't you guys ?!