Igh: "Alitalia DC-9 / 14Nov90 DC-9-32 I-ATJA , ILS- CFIT; … flew about 900' too low on approach to Zurich … into a hill about 9.6 km from the city's airport at night. Fatal=40 passengers + six crew. … false Glide Slope indication with no Flag … "
That accident was a combination of Alitalia's complex ILS cockpit configuration, which left just one ILS receiver usable on that approach, and a KNR-6030 VOR/ILS receiver that had a history of intermittent false indications with no monitor channel to catch errors.
A DC-8 cargo captured a false localizer beam at Cold Harbor in Alaska in the mid-1970s, and hit a mountain in the dark.
GB