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Accident
Last updated: 22 October 2017
Statuts:Enquête Officielle
Date:samedi 28 décembre 1946
Heure:02:09 UTC
Type/Sous-type:Silhouette image of generic CONI model; specific model in this crash may look slightly different
Lockheed L-049 Constellation
Compagnie:Transcontinental & Western Air - TWA
Immatriculation: NC86505
Numéro de série: 2026
Année de Fabrication:
Heures de vol:1098
Moteurs: 4 Wright R-3350 (745C18BA3) Cyclone
Equipage:victimes: 4 / à bord: 9
Passagers:victimes: 5 / à bord: 14
Total:victimes: 9 / à bord: 23
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:1,5 km (0.9 milles) WNW of Shannon Airport (SNN) (   Irlande)
Phase de vol: En approche (APR)
Nature:Transport de Passagers Intern.
Aéroport de départ:Paris-Orly Airport (ORY/LFPO), France
Aéroport de destination:Shannon Airport (SNN/EINN), Irlande
Numéro de vol:6963
Détails:
TWA's Constellation "Cairo Skychief" departed Paris-Orly at 23:16 on a flight to New York via Shannon and Gander. The en route portion of the flight was uneventful and at 02:00 Shannon control tower cleared the aircraft for approach to runway 14. At 02:06 the flight reported over the range station at 1,200 feet at which time Shannon Tower advised it that Shannon was reporting 10/10 cloud cover at 400 feet, 4/10 at 250 feet, visibility 1 mile, wind 120 degrees, 5 knots. While turning to the left for final approach to runway 14, the aircraft passed behind a low hill which blocked the airport lights from the pilot's vision.
At the end of a left hand turn to finals. During this turn the aircraft lost at least 150 feet of altitude and the left wing tip struck the ground. The plane crashed and caught fire.

Probable Cause:

PROBABLE CAUSE: "An error in altimeter indication, the primary reason for which was the reversal of the primary and alternative static source lines which led the pilot to conduct his approach to the airport at a dangerously low altitude. A contributing factor was the negligence of maintenance personnel in certifying to the satisfactory functioning of the static system although the tests required to determine such a condition were not accomplished. A further contributing factor was the restriction of vision from the cockpit resulting from fogging of the unheated windshield panels."

Sources:
» Air Britain Casualty compendium (pt. 45)
» CAB File No. 6127-46


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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 Paris-Orly Airport et Shannon Airport est de 901 km (563 miles).
Accident location: Approximate; accuracy within a few kilometers.

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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