Accident
Last updated: 31 October 2014
Estado:Final
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: Anulado
Consecuencias: Written off (damaged beyond repair)
Ubicación:Boston-Logan International Airport, MA (BOS) (   Estados Unidos de América) show on map
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: 723
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 385km/h (80km/h too fast) and was 60m 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 500m with 60m 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: "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."

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

Official accident investigation report
investigating agency: National Transport Safety Bureau (NTSB) - United States of America
report status: Final
report number: NTSB/AAR-74-03
report released:07-MAR-1974
duration of investigation:219 days (7.3 months)
download report: Delta Air Lines, Inc., DC-9-31, N975NE, Boston, Massachusetts, July 31, 1973 (NTSB/AAR-74-03)

Subsiguiente / acciones de seguridad

NTSB issued 8 Safety Recommendations

Show all AD's and 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 Manchester Municipal Airport, NH to Boston-Logan International Airport, MA as the crow flies is 72 km (45 miles).

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DC-9-30

  • 14th loss
  • 662 built
  • 3rd worst accident (a la hora)
  • 8th worst accident (actualmente)
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 Estados Unidos de América
  • 5th worst accident (a la hora)
  • 20th worst accident (actualmente)
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