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Last updated: 20 September 2021
Statuts:Enquête Officielle
Date:dimanche 25 août 1996
Heure:07:10
Type/Sous-type:Silhouette image of generic L101 model; specific model in this crash may look slightly different
Lockheed L-1011 TriStar 100
Compagnie:Trans World Airlines - TWA
Immatriculation: N31031
Numéro de série: 1115
Année de Fabrication: 1975
Heures de vol:3425
Equipage:victimes: 0 / à bord: 12
Passagers:victimes: 0 / à bord: 250
Total:victimes: 0 / à bord: 262
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:New York-John F. Kennedy International Airport, NY (JFK) (   Etats-Unis d'Amérique)
Phase de vol: A l'atterrissage (LDG)
Nature:Transport de Passagers Nat.
Aéroport de départ:Las Vegas-McCarran International Airport, NV (LAS/KLAS), Etats-Unis d'Amérique
Aéroport de destination:New York-John F. Kennedy International Airport, NY (JFK/KJFK), Etats-Unis d'Amérique
Numéro de vol:TW778
Détails:
Trans World Airlines (TWA), flight 778 was substantially damaged when the tail struck the runway, while landing at New York-John F. Kennedy International Airport (JFK). The 3 flight crewmembers, 9 flight attendants, and 250 passengers were not injured. Instrument meteorological conditions prevailed at the time of the accident. The flight departed Las Vegas, Nevada (LAS), at 03:10. The first officer was the flying pilot and performed the takeoff.
The departure and en route phases of the flight were uneventful. Descending towards New York-JFK Airport the crew were planning an approach and landing on runway 04R. The air traffic controller reported that visibility was rapidly decreasing to 1000, which was below the aircraft minima. The controller then cleared the flight for an approach to runway 04L. While on the approach to runway 4L, attempts to engage the auto-throttles were unsuccessful, and the captain told the first officer to fly the approach using manual throttles. The captain reported that when the first officer requested the ILS 4L approach plate, he replied, "just fly the approach it is near VFR."
According to TWA manuals, the correct altimeter bug setting for a Category II approach to runway 4R would be 112 feet, and for a Category I approach to 4L would be 212 feet.
At 07:08, the captain contacted the JFK control tower and stated that they were on the localizer for runway 4 left. The JFK local controller replied, "TWA seven seventy eight Kennedy number one wind calm runway four left cleared to land RVR more than six thousand rollout one thousand six hundred."
The first officer stated that at 50 feet above the ground (AGL), the autopilot began to flare the airplane, and he retarded the throttles. He said that it, "looked a little high." About that time, the stick shaker activated. The captain noticed the airspeed was 120 knots, and that the altitude was about 30 feet AGL. He captain pushed the throttles forward and the airplane touched down hard. The captain then took control of the airplane, closed the throttles, initiated reverse thrust, and made a normal rollout.
A witness reported that he was at the approach end of runway 4L at the time of occurrence, at taxiway KILO, about 100 yards from the touchdown point. He stated that the airplane hit on the tail first and then the tires. The touchdown point was shorter than normal, and he heard a bang at touchdown.

Probable Cause:

PROBABLE CAUSE: "Failure of the flight crew to complete the published checklist and to adequately cross-check the actions of each other, which resulted in their failure to detect that the leading edge slats had not extended and led to the aircraft's tail contacting the runway during the computer-driven, auto-land flare for landing. Factors related to the accident were: the manufacturer's inadequate inspection procedures for the slat drive system; and the operator's inadequate checklist, which did not include having the flight engineer monitor the double needle slat gauge."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 7 months
Accident number: NYC96FA174
Download report: Summary report

Sources:
» NTSB


Opérations de secours

NTSB issued 2 Safety Recommendations

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Plan
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Las Vegas-McCarran International Airport, NV et New York-John F. Kennedy International Airport, NY est de 3585 km (2241 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 tel qu'ils sont connus à ce jour.
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