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Last updated: 24 September 2021
Fecha:sábado 23 junio 1973
Tipo:Silhouette image of generic DC86 model; specific model in this crash may look slightly different
McDonnell Douglas DC-8-61CF
Operado por:Loftleidir
Alquilado a :Seaboard World Airlines
Registración: N8960T
Numéro de série: 45938/331
Año de Construcción: 1968
Horas Totales de la Célula:21258
Motores: 4 Pratt & Whitney JT3D-3B
Tripulación:Fatalidades: 0 / Ocupantes: 9
Pasajeros:Fatalidades: 0 / Ocupantes: 119
Total:Fatalidades: 0 / Ocupantes: 128
Daños en la Aeronave: Considerable
Consecuencias: Repaired
Ubicación:New York-John F. Kennedy International Airport, NY (JFK) (   Estados Unidos de América)
Fase: Aterrizaje (LDG)
Naturaleza:Vuelo Internacional Programado
Aeropuerto de Salida:Keflavík International Airport (KEF/BIKF), Islandia
Aeropuerto de Llegada:New York-John F. Kennedy International Airport, NY (JFK/KJFK), Estados Unidos de América
Loftleidir Flight 509 originated in Stockholm and was destined for New York with intermediate stops in Oslo and Reykjavik. The flight departed Keflavik Airport at 22:14 EDT. The flight from Keflavik to the outer marker of the ILS for runway 31R at New York-JFK was routine. At 03:56 Flight 509 contacted the tower and was cleared to land on runway 31R; the wind was 200deg at 3 knots. The captain decided to arm the spoilers just before touchdown rather than just after the landing gear had been extended. The latter is called for in the before-landing checklist. Shortly after the call to arm the spoilers, the aircraft struck the runway, tail first, and in a nose-high attitude. Later, the captain stated that he had called for the spoilers to be armed at an altitude between 20 and 30 feet. After impact, all engines were shut down by means of fire shutoff levers; fire extinguishers were discharged.
The first officer stated that because he could not arm the spoilers with his left hand, he had to use both hands. He also stated that he might have pulled back on the activating lever which deployed the spoilers.

Probable Cause:

PROBABLE CAUSE: "The first officer's inadvertent deployment of the ground spoilers in flight while he was attempting to arm the spoiler system. The captain's decision to delay arming of the spoilers until just before touchdown was a contributing factor, because the timing varied from normal procedures and required the crewmembers to act quickly, without time for corrective action."

Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 165 days (6 months)
Accident number: NTSB-AAR-73-20
Download report: Final report

» NTSB-AAR-73-20

Subsiguiente / acciones de seguridad
As a result of an accident near Toronto on July 5, 1970, involving an Air Canada DC-8, the Federal Aviation Administration issued Airworthiness Directive AD 70-25-02 cautioning pilots against in-flight operation of ground spoilers by requiring the installation of a warning placard in the cockpit and the insertion of an additional Operating Limitation in the Flight Manual.

NTSB issued 2 Safety Recommendations

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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 Keflavík International Airport to New York-John F. Kennedy International Airport, NY as the crow flies is 4131 km (2582 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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