ILS "Gotcha" Errors
 

NZ CAA recently published its report into an incident where a B767 "captured" a non-existent glide path. Flightdeck ILS indications, however, were substantially normal.

NZ CAA Report

The report goes into a lot of useful background on ILS technology and some of the consequent operational problems which might arise if crews fail to play "devil's advocate" during critical stages of flight.

FYI

Thanks John, nice one.