Descripción del Accidente ASN 31 JUL 1973 McDonnell Douglas DC-9-31 N975NE - Boston-Logan International Airport, MA (BOS)
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Estado:Accident investigation report completed and information captured
Fecha:martes 31 julio 1973
Hora:11:08
Tipo:Silhouette image of generic DC93 model; specific model in this crash may look slightly different
McDonnell Douglas DC-9-31
Operador:Delta Air Lines
Registración: N975NE
Numéro de série: 47075/166
Año de Construcción: 1967
Horas Totales de la Célula:14639
Motores: 2 Pratt & Whitney JT8D-7
Tripulación:Fatalidades: 6 / Ocupantes: 6
Pasajeros:Fatalidades: 82 / Ocupantes: 83
Total:Fatalidades: 88 / Ocupantes: 89
Daños en la Aeronave: Destruido
Consecuencias: Written off (damaged beyond repair)
Ubicación:Boston-Logan International Airport, MA (BOS) (   Estados Unidos de América)
Elevación del lugar del accidente: 6 m (20 feet) amsl
Fase: Aproximación (APR)
Naturaleza:Vuelo Doméstico Programado
Aeropuerto de Salida:Manchester Municipal Airport, NH (MHT/KMHT), Estados Unidos de América
Aeropuerto de Llegada:Boston-Logan International Airport, MA (BOS/KBOS), Estados Unidos de América
Número de Vuelo:DL723
Descripción:
As Delta Flight 723 was descending, the approach clearance was given by the controller after a delay, because the controller was preoccupied with a potential conflict between two other aircraft. This caused the flight to be poorly positioned for approach. The aircraft passed the Outer Marker at a speed of 385 km/h (80 km/h too fast) and was 60 m above the glide slope.
The flight director was inadvertently used in the 'go-around-mode', which led to abnormal instrument indications. This caused some confusion. The first officer, who was flying the approach became preoccupied with the problem. The DC-9 continued to descend and struck a seawall 3000 feet short of and 150 feet to the right of runway 04R, crashed and caught fire. RVR at the time was 500 m with 60 m overcast.
All occupants, except one passenger, were killed in the crash. The lone survivor, who had been injured critically, died on December 11, 1973.

Probable Cause:

PROBABLE CAUSE: "The failure of the flight crew to monitor altitude and to recognize passage of the aircraft through the approach decision height during an unstabilized precision approach conducted in rapidly changing meteorological conditions. The unstabilized nature of the approach was due initially to the aircraft's passing the outer marker above the glide slope at an excessive airspeed and thereafter compounded by the flight crew's preoccupation with the questionable information presented by the flight director system. The poor positioning of the flight for the approach was in part the result of nonstandard air traffic control services."

Accident investigation:

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Investigating agency: NTSB
Status: Investigation completed
Duration: 219 days (7 months)
Accident number: NTSB/AAR-74-03
Download report: Final report

Fuentes:
» Air Disasters / D.Gero (118-120)
» ICAO Circular 132-AN/93 (79-90)
» NSTB-AAR-74-3


Subsiguiente / acciones de seguridad

NTSB issued 8 Safety Recommendations

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Fotos

photo of DC-9-31-N975NE
accident date: 31-07-1973
type: McDonnell Douglas DC-9-31
registration: N975NE
 

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 Manchester Municipal Airport, NH to Boston-Logan International Airport, MA as the crow flies is 72 km (45 miles).

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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DC-9-30

  • 662 built
  • 14th loss
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