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Last updated: 19 September 2021
Status:Definitief
Datum:zondag 5 september 1954
Tijd:02:39
Type:Silhouette image of generic CONI model; specific model in this crash may look slightly different
Lockheed L-1049C-55-81 Super Constellation
Luchtvaartmaatschappij:KLM Royal Dutch Airlines
Registratie: PH-LKY
Constructienummer: 4509
Bouwjaar: 1953
Aantal vlieguren:2498
Motoren: 4 Wright R-3350 (972TC18DA1)
Bemanning:slachtoffers: 3 / inzittenden: 10
Passagiers:slachtoffers: 25 / inzittenden: 46
Totaal:slachtoffers: 28 / inzittenden: 56
Schade: Afgeschreven
Gevolgen: Written off (damaged beyond repair)
Plaats:2,5 km (1.6 mijl) SE van Shannon Airport (SNN) (   Ierland)
Fase: InitiŽle klim (ICL)
Soort vlucht:Internationale lijnvlucht
Vliegveld van vertrek:Shannon Airport (SNN/EINN), Ierland
Vliegveld van aankomst:New York-Idlewild International Airport, NY (IDL/KIDL), Verenigde Staten
Vluchtnummer:KL633
Beschrijving:
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."

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


Foto's

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

Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Shannon Airport en New York-Idlewild International Airport, NY bedraagt 4910 km (3069 miles).
Accident location: Exact; deduced from official accident report.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Networkís opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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Lockheed L-1049

  • 564 built
  • 5e ongeval
  • 2e dodelijk ongeval
  • The zwaarste ongeval (toen het plaatsvond)
  • 13e zwaarste ongeval (op dit moment)
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 Ierland
  • 2e zwaarste ongeval (toen het plaatsvond)
  • 5e zwaarste ongeval (op dit moment)
» safety profile