Accident
Last updated: 28 August 2014
Status:Schlussbericht
Datum:Donnerstag 17 Juni 1948
Zeit:12:41
Flugzeugtyp:Silhouette image of generic DC6 model; specific model in this crash may look slightly different
Douglas DC-6
Fluggesellschaft:United Air Lines
Kennzeichen: NC37506
Werknummer: 42871/12
Baujahr: 1947
Betriebsstunden:1245
Triebwerk: 4 Pratt & Whitney R-2800
Besatzung:Todesopfer: 4 / Insassen: 4
Fluggäste:Todesopfer: 39 / Insassen: 39
Gesamt:Todesopfer: 43 / Insassen: 43
Sachschaden: Zerstört
Konsequenzen: Written off (damaged beyond repair)
Unfallort:5 km (3.1 Meilen) ENE of Mount Carmel, PA (   USA) show on map
Flugphase: Während des Fluges (ENR)
Betriebsart:Inländischer planmäßiger Passagierflug
Flug von:Chicago (unknown airport), IL, USA
Flug nach:New York-La Guardia Airport, NY (LGA/KLGA), USA
Flugnummer: 624
Unfallbericht:
The airplane, named "Mainliner Utah", arrived in Chicago at 09:52 en route from Los Angeles to New York. After a 52-minute turnaround, the DC-6 departed for New York. The airplane climbed en route to its planned altitude of 17,000 feet. At 12:23, and at 12:27 the crew made a routine acknowledgment of a clearance to descend en route to an altitude between 13,000 and 11,000 feet. A little later a fire warning led the crew to believe that a fire had erupted in the forward cargo hold. They then discharged at least one bank of the CO2 fire extinguisher bottles in the forward cargo hold. Because they did not follow the correct procedure, the cabin pressure relief valves were closed. This caused hazardous concentrations of the gas to enter into the cockpit. These concentrations reduced the pilots to a state of confused consciousness probably resulting in loss of consciousness. An emergency descent was initiated until it described a shallow left turn, heading towards constantly rising terrain. Five miles east of Shamokin the airplane, flying only 200 feet above the ground, entered a right climbing turn. As it passed to the north of Mt. Carmel, the climbing turning attitude increased sharply. The airplane then crashed in a power line clearing on wooded hillside at an elevation of 1,649 feet. The airplane struck a 66,000 volt transformer, severed power lines and burst into flames.
Investigation revealed that the fire warning in the cargo compartment had been false.


PROBABLE CAUSE: "The Board determines that the probable cause of this accident was the incapacitation of the crew by a concentration of CO2 gas in the cockpit."

Informationsquelle:
» CAB File No. 1-0075-48


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This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s 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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Douglas DC-6

  • 3rd loss
  • 704 built
  • 2nd worst accident (Zu diesem Zeitpunkt)
  • 22nd worst accident (Momentan)
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 USA
  • 4th worst accident (Zu diesem Zeitpunkt)
  • 76th worst accident (Momentan)
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