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Accident
Last updated: 22 October 2017
Estado:Final
Fecha:domingo 1 diciembre 1974
Hora:19:26
Tipo:Silhouette image of generic B722 model; specific model in this crash may look slightly different
Boeing 727-251
Operador:Northwest Orient Airlines
Registración: N274US
Numéro de série: 20296/777
Año de Construcción: 1969-11-25 (5 years )
Motores: 3 Pratt & Whitney JT8D-7B
Tripulación:Fatalidades: 3 / Ocupantes: 3
Pasajeros:Fatalidades: 0 / Ocupantes: 0
Total:Fatalidades: 3 / Ocupantes: 3
Daños en la Aeronave: Anulado
Consecuencias: Written off (damaged beyond repair)
Ubicación:Stony Point, NY (   Estados Unidos de América)
Fase: En ruta (ENR)
Naturaleza:Ferry/Posicionado
Aeropuerto de Salida:New York-John F. Kennedy International Airport, NY (JFK/KJFK), Estados Unidos de América
Aeropuerto de Llegada:Buffalo-Greater Buffalo International Airport, NY (BUF/KBUF), Estados Unidos de América
Número de Vuelo:NW6231
Descripción:
Flight NW6231 departed New York-JFK at 19:14 for a ferry flight to Buffalo and was cleared by departure control to climb to FL140. At 19:21 the flight was cleared to climb to FL310. The aircraft began to climb 2500fpm at an airspeed of 305 knots. As the aircraft climbed through FL160, both the airspeed and the rate of climb began to increase. Reaching FL230, the airspeed had reached 405 knots and the rate of climb had exceeded 6500fpm. The overspeed warning horn sounded a little later, followed 10 seconds later by a stickshaker stall warning. The aircraft then leveled at 24800 feet with a speed of 420 knots until it turned rapidly to the right, 13 seconds later. The airplane started to descend out of control, reaching a vertical acceleration of +5g until it struck the ground in a slightly nose down and right wing-down attitude. The aircraft had descended from 24000 feet to 1090 feet in 83 seconds.

Probable Cause:

PROBABLE CAUSE: "The loss of control of the aircraft because the flight crew failed to recognize and correct the aircraft's high-angle-of-attack, low-speed stall and its descending spiral. The stall was precipitated by the flight crew's improper reaction to erroneous airspeed and Mach indications which had resulted from a blockage of the pitot heads by atmospheric icing. Contrary to standard operational procedures, the flight crew had not activated the pitot head heaters."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 255 days (9 months)
Accident number: NTSB/AAR-75-13
Download report: Final report

Fuentes:
» Flight International 06.03.1975 (355)
» NTSB Safety Recommendations A-75-27
» NTSB-AAR-75-13


Subsiguiente / acciones de seguridad

NTSB issued 3 Safety Recommendations

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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from New York-John F. Kennedy International Airport, NY to Buffalo-Greater Buffalo International Airport, NY as the crow flies is 480 km (300 miles).
Accident location: Exact; as reported in the official accident report.

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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Boeing 727

  • 1832 built
  • 21st loss
  • 18th accidente fatal
  • 16th worst accident (a la hora)
  • 55th worst accident (actualmente)
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