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Accident
Last updated: 12 December 2017
Estado:Final
Fecha:martes 8 septiembre 1970
Hora:21:14
Tipo:Silhouette image of generic DC93 model; specific model in this crash may look slightly different
McDonnell Douglas DC-9-32
Operador:Delta Air Lines
Registración: N3329L
Numéro de série: 47108/251
Año de Construcción: 1968
Horas Totales de la Célula:7601
Ciclos:914
Motores: 2 Pratt & Whitney JT8D-7
Tripulación:Fatalidades: 0 / Ocupantes: 5
Pasajeros:Fatalidades: 0 / Ocupantes: 89
Total:Fatalidades: 0 / Ocupantes: 94
Daños en la Aeronave: Considerable
Consecuencias: Repaired
Ubicación:Louisville-Standiford Field, KY (SDF) (   Estados Unidos de América)
Fase: Aterrizaje (LDG)
Naturaleza:Vuelo Doméstico Programado
Aeropuerto de Salida:Chicago-O'Hare International Airport, IL (ORD/KORD), Estados Unidos de América
Aeropuerto de Llegada:Louisville-Standiford Field, KY (SDF/KSDF), Estados Unidos de América
Número de Vuelo:DL439
Descripción:
Delta Air Lines Flight 439 was a scheduled flight from Chicago to Atlanta with intermediate stops at Louisville and Lexington. The DC-9 departed Chicago at 20:13 on an Instrument Flight Rules (IFR) flight plan. At 21:01, Louisville Approach Control established radar contact with Flight 439. Vectors and altitude information were given the crew until the flight was turned to a heading that would intercept the inbound ILS localizer course to runway 29. The flight was subsequently cleared for an ILS approach. Landing weight had been computed to be 92,000 pounds, which established an approach reference airspeed of 123 knots. Flaps had been extended to 50 degrees. When Flight 439 made the approach which terminated in the accident, the high intensity runway lights were set at step 3, medium bright, and the reported flight visibility was 7 miles. Runway 29 did not have a prepared underrun/overrun area. The ground leading to the threshold slopes upward 2deg 44’, a gradient of approximately 5 percent. Flight 439 made initial ground contact on this incline 156 feet short of the threshold of the runway, rolled forward 73 feet, and became airborne. The aircraft then contacted the runway 262 feet beyond the threshold and continued to roll/skid on the runway before it came to rest 4,457 feet beyond the threshold. Wreckage examination showed that the fuselage had fractured and buckled in the area between fuselage stations 737 and 794. The tail cone rested on the runway.

Probable Cause:

PROBABLE CAUSE: "The National Transportation Safety Board determines that the probable cause of this accident was the pilot’s misjudgment of altitude due to the absence of sufficient lights in the approach area, misleading information produced by deceptive sloping terrain, and that the pilot did not position the aircraft on the ILS glide slope while he was establishing the final approach profile."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 2 months
Accident number: NTSB/AAR-71-15
Download report: Final report

Fuentes:
» NTSB-AAR-71-15


Fotos

photo of McDonnell Douglas DC-9-32 N3329L
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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 Chicago-O'Hare International Airport, IL to Louisville-Standiford Field, KY as the crow flies is 458 km (286 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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