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Accident
Last updated: 20 April 2018
Statuts:Enquête Officielle
Date:jeudi 14 août 1958
Heure:ca 03:50 GMT
Type/Sous-type:Silhouette image of generic CONI model; specific model in this crash may look slightly different
Lockheed L-1049H-01-06-162 Super Constellation
Compagnie:KLM Royal Dutch Airlines
Immatriculation: PH-LKM
Numéro de série: 4841
Année de Fabrication: 1958
Heures de vol:886
Equipage:victimes: 8 / à bord: 8
Passagers:victimes: 91 / à bord: 91
Total:victimes: 99 / à bord: 99
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:180 km (112.5 milles) W de Shannon, Ireland (   Océan Atlantique)
Phase de vol: En vol (ENR)
Nature:Transport de Passagers Intern.
Aéroport de départ:Shannon Airport (SNN/EINN), Irlande
Aéroport de destination:Gander Airport, NL (YQX/CYQX), Canada
Numéro de vol:KL607E
Détails:
A Lockheed L-1049H Super Constellation, named "Hugo de Groot", impacted the water of the Atlantic Ocean 180 kilometers west off Shannon, Ireland. All 91 passengers and eight crew members were killed.
Flight 607E had departed Amsterdam-Schiphol Airport in the Netherlands on a service to New York-Idlewild Airport, USA, with refueling stops at Shannon, Ireland. and Gander, Canada.
The aircraft departed Shannon at 03:05 GMT. Last radio contact with the aircraft was at 03:40 GMT. Nothing more was heard from the flight. Pieces wreckage were found 110 miles NNW off the Irish coast.
The wreckage gave the impression that the slope of the flight path was not very great at the moment of impact.

Probable Cause:

PROBABLE CAUSE: "On the basis if the evidence available and the investigation of possible serious threats to safety, the Board cannot establish the cause of the accident with certainty. Moreover, investigation of the possibility that the cause of the accident may have been a bomb explosion has yielded no conclusive facts to support such a hypothesis. The statements in the press to this effect have either been based on misunderstandings or else were tendentious. On the other hand, the Board attributes a high degree of probability to hypothesis that the cause of the accident is related to 'overspeeding' of one of the outboard propellers resulting from oil polution after a gear had been damaged when the supercharger of the corresponding engine was accelerated (shifted). This probably took place close to the time of the accident. The overspeeding of the propeller, owing to the obstruction of metal particles in the regulator valves may have been such as to cause the propeller pitch to decrease and the propeller could not be feathered. The condition might provoke a flight disturbance which could be corrected only by prompt and powerful handling of aileron and rudder controls. in view of the rapidity with which this defect develops and taking into account that recognition of the nature of this malfunction requires a certain time, it is not always possible for the crew to intervene early enough to restore conditions of controlled flight. With respect to the presumed cause of the accident the Board has no grounds to suppose that the occurrence of the presumed malfunction might be attributable to neglect on the part of maintenance personnel or to incorrect measures taken by the crew or that the crew had been at fault in piloting the aircraft after the malfunction had occurred."

Sources:
» ICAO Circular 64-AN/58 (23-30)
» Nederlandse Constallations / H.Dekker


Opérations de secours
The Board has noted with satisfaction that after the accident the propeller governors corresponding with those used by KLM have been provided with a device which is designed to improve the reliability of the featuring mechanism. Based on the results of the investigation, the Board recommends that in order to reduce the risk of malfunctions of the propeller pitch regulating mechanism due to oil pollution, the oil feed lines serving the propeller mechanism should be separated from those of the engines.

Photos

photo of Lockheed L-1049H-01-06-162 Super Constellation PH-LKM
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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 Shannon Airport et Gander Airport, NL est de 3156 km (1972 miles).
Accident location: Exact; as reported in the 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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