Date: November 14, 1990
Time: 19:11
Location: Stadelberg, Switzerland
Operator: Alitalia
Flight #: 404
Route: Milano - Zürich
AC Type: McDonnell Douglas DC-9-32
Registration: I-ATJA
cn / ln: 47641/746
Aboard: 46   (passengers:40  crew:6)
Fatalities: 46   (passengers:40  crew:6)
Ground: 0
Summary: The aircraft continued to descend after intercepting the glide slope and hit high ground 6 miles from the airport. False indication of VHF NAV on unit No.1 in the aircraft. Possible misread altimeter by the pilot-in-command. Lack of GPWS warning in the cockpit. Crew was not aware of the possibility of incorrect indications in the NAV equipment in use. Non-compliance with basic procedural instructions during the approach. ATC did not observe the leaving of the cleared altitude of 4,000 ft.

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