Flugunfall 14 NOV 1990 einer McDonnell Douglas DC-9-32 I-ATJA - Stadlerberg
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Status:Accident investigation report completed and information captured
Datum:Mittwoch 14 November 1990
Zeit:19:11
Flugzeugtyp:Silhouette image of generic DC93 model; specific model in this crash may look slightly different
McDonnell Douglas DC-9-32
Fluggesellschaft:Alitalia
Kennzeichen: I-ATJA
Werknummer: 47641/746
Baujahr: 1974
Betriebsstunden:43894
Anzahl Zyklen der Zelle:43452
Triebwerk: 2 Pratt & Whitney JT8D-9A
Besatzung:Todesopfer: 6 / Insassen: 6
Fluggäste:Todesopfer: 40 / Insassen: 40
Gesamt:Todesopfer: 46 / Insassen: 46
Sachschaden: Zerstört
Konsequenzen: Written off (damaged beyond repair)
Unfallort:Stadlerberg (   Schweiz)
Flugphase: Annäherung (APR)
Betriebsart:Internationaler Linienflug
Flug von:Milano-Linate Airport (LIN/LIML), Italien
Flug nach:Zürich-Kloten Airport (ZRH/LSZH), Schweiz
Flugnummer:AZ404
Unfallbericht:
Alitalia Flight 404 took off from runway 36R at Linate Airport in Milan, Italy at 18:36 on a scheduled passenger service to Zurich, Switzerland.
After an uneventful flight, AZ404 was cleared to descend to 4000 feet and to make an ILS approach to runway 14 at Zürich-Kloten Airport. At 14 nm from the runway 14 threshold, the aircraft captured the localizer. At about 11,5 nm short, the aircraft descended through the cleared altitude of 4000 feet. Descent from 4000 feet was only allowed after intercepting the glide path at 8 nm.
The aircraft descended about 1400 feet below the glide path until it struck trees on the Stadlerberg mountainside at an elevation of 506 meters, 5,2 nm from the runway. The aircraft crashed and broke up, killing all 46 on board.

Probable Cause:

URSACHEN:
Der Unfall ist zurückzuführen auf:
– Fehlanzeige des VHF-NAV-Gerätes Nr. 1 im Flugzeug.
– Wahrscheinliche Fehlablesung des Höhenmessers seitens des PIC.
– Fehlende GPWS-Warnung im Cockpit.
– Unkenntnis der Piloten über die Möglichkeit einer Fehlanzeige der verwendeten NAV-Anlage bei Fehlen eines Flag-Alarms.
– Mangelhafte Fehleranalyse durch die Piloten.
– Nichteinhalten grundlegender Verfahrensregeln beim Anflug durch die Piloten.
– Unzweckmässige Zusammenarbeit zwischen den Piloten im Anflug.
– Abbruch des vom COPI eingeleiteten Durchstartverfahrens durch den PIC.
– Nichtbeachten des Verlassens der freigegebenen Höhe von 4000 ft QNH vor dem FAP seitens des Flugverkehrsleiters.

Accident investigation:

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Investigating agency: BFU Switzerland
Status: Investigation completed
Duration: 2 years and 3 months
Accident number: Nr. 1457
Download report: Final report

Informationsquelle:
» Air Safety Week 5 April 1993 (p. 4,5)
» NTSB Safety Recommendations A-92-8 and 9


Fotos

photo of DC-9-32-I-ATJA
photo of DC-9-32-I-ATJA
accident date: 14-11-1990
type: McDonnell Douglas DC-9-32
registration: I-ATJA
 

Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Milano-Linate Airport to Zürich-Kloten Airport as the crow flies is 230 km (144 miles).
Accident location: Exact; deduced from official accident report.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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DC-9-30

  • 662 built
  • 42nd loss
  • 29th Fataler Unfall
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