Accident
Last updated: 30 October 2014
Statuts:Enquête Officielle
Date:samedi 17 mars 2001
Heure:07:05
Type/Sous-type:Silhouette image of generic A320 model; specific model in this crash may look slightly different
Airbus A320-212
Compagnie:Northwest Airlines
Immatriculation: N357NW
Numéro de série: 830
Année de Fabrication: 1998
Heures de vol:9346
Moteurs: 2 CFMI CFM56-5A3
Equipage:victimes: 0 / à bord: 6
Passagers:victimes: 0 / à bord: 145
Total:victimes: 0 / à bord: 151
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:Detroit-Metropolitan Wayne County Airport, MI (DTW) (   Etats-Unis d'Amérique)
Phase de vol: Au décollage (TOF)
Nature:Transport de Passagers Nat.
Aéroport de départ:Detroit-Metropolitan Wayne County Airport, MI (DTW/KDTW), Etats-Unis d'Amérique
Aéroport de destination:Miami International Airport, FL (MIA/KMIA), Etats-Unis d'Amérique
Numéro de vol: 985
Détails:
Takeoff was initiated on runway 3C (8,500 feet by 200 feet, wet). The flight crew reported that at an airspeed of approximately 110 knots, the nose of the airplane began to lift off. The captain attempted to lower the nose, however, the airplane was unresponsive. The airplane became airborne and climbed to an altitude of 20 to 30 feet above the runway. The captain reduced the power on both engines and the airplane settled to the runway, striking the tail. The airplane traveled approximately 700 feet off the end of the runway where it came to rest in the muddy terrain. An emergency evacuation was performed during which the L2 evacuation slide did not deploy. During the investigation, NTSB determined that the airplane was loaded so that its center of gravity (CG), although within limits, was in the aft region of the permissible range. Further, the flight crew had incorrectly set the trim for the trimmable horizontal stabilizer (THS) at -1.7°UP (airplane nose up). This setting resulted in a pitch-up trim condition. The proper trim setting, 1.7°DN (airplane nose down), would have resulted in a correct trim condition for the way the airplane was loaded. The improperly set trim caused the nose of the airplane to lift off the runway prematurely.

PROBABLE CAUSE: "The pilot induced oscillations and the delay in aborting the takeoff. Factors associated with the accident were the first officer used an improper trim setting and the captain did not identify and correct the setting during the taxi checklist, and the wet runway conditions."

Sources:
» NTSB id CHI01FA104


Opérations de secours

FAA issued 1 Airworthiness Directive
NTSB issued 4 Safety Recommendations

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Plan
Ce plan montre l'aéroport de départ ainsi que la supposé destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Detroit-Metropolitan Wayne County Airport, MI et Miami International Airport, FL est de 1834 km (1146 miles).

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tels qui sont connus à ce jour.
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