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Last updated: 16 September 2021
Statuts:Enquête Officielle
Date:dimanche 5 septembre 1954
Heure:02:39
Type/Sous-type:Silhouette image of generic CONI model; specific model in this crash may look slightly different
Lockheed L-1049C-55-81 Super Constellation
Compagnie:KLM Royal Dutch Airlines
Immatriculation: PH-LKY
Numéro de série: 4509
Année de Fabrication: 1953
Heures de vol:2498
Moteurs: 4 Wright R-3350 (972TC18DA1)
Equipage:victimes: 3 / à bord: 10
Passagers:victimes: 25 / à bord: 46
Total:victimes: 28 / à bord: 56
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:2,5 km (1.6 milles) SE de Shannon Airport (SNN) (   Irlande)
Phase de vol: En montée initiale (ICL)
Nature:Transport de Passagers Intern.
Aéroport de départ:Shannon Airport (SNN/EINN), Irlande
Aéroport de destination:New York-Idlewild International Airport, NY (IDL/KIDL), Etats-Unis d'Amérique
Numéro de vol:KL633
Détails:
The KLM Super Constellation, named "Triton", operated on the Amsterdam-New York route. A scheduled refueling stop was made at Shannon. The flight left Shannon Terminal Building at 02:30 hours at night and taxied to runway 14 (5643 feet long). The before takeoff run-up was completed in takeoff position.
Takeoff was made at 02:38. V1 speed was reached at 3500 feet and lift-off at 125 knots was made just over the V2 speed at approximately 4000 feet from threshold. The flight then passed over the remaining 1600 feet of runway in a shallow climb, retracting its landing gear. The Constellation entered a shallow descent over the River Shannon. The duration of the flight was about 31 seconds from the time it passed over the end of the runway until the aircraft first contacted the water in a tail-down slightly right-wing low attitude. It came to rest on the Middle Ground, a shallow mudbank 8170 feet from the end of the runway, after losing engines no. 3 and 4.

Probable Cause:

PROBABLE CAUSE: "1) Failure of the captain to correlate and interpret his instrument indications properly during flap retraction, resulting in necessary action not being taken in sufficient time. This failure was partially accounted for by the effect on instrument indications of inadvertent and unexpected gear re-extension. 2) Loss of aircraft performance due to inadvertent landing gear re-extension. 3) The captain failed to maintain sufficient climb to give him an opportunity of meeting unexpected occurrences."

Sources:
» ICAO Accident Digest Circular 50-AN/45 (20-33)
» Nederlandse Constallations / H.Dekker


Photos

photo of Lockheed-L-1049C-Super-Constellation-PH-LKY
accident date: 05-09-1954
type: Lockheed L-1049C Super Constellation
registration: PH-LKY
photo of Lockheed-L-1049C-Super-Constellation-
Flight path of KLM Flt 633 after takeoff from Shannon - 5 SEP 1954
 

Video, social media

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 Shannon Airport et New York-Idlewild International Airport, NY est de 4910 km (3069 miles).
Accident location: Exact; deduced from official accident report.

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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Lockheed L-1049

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