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Last updated: 25 September 2021
Statuts:Enquête Officielle
Date:samedi 23 juin 1973
Heure:03:58
Type/Sous-type:Silhouette image of generic DC86 model; specific model in this crash may look slightly different
McDonnell Douglas DC-8-61CF
Opérant pour:Loftleidir
Loué à :Seaboard World Airlines
Immatriculation: N8960T
Numéro de série: 45938/331
Année de Fabrication: 1968
Heures de vol:21258
Moteurs: 4 Pratt & Whitney JT3D-3B
Equipage:victimes: 0 / à bord: 9
Passagers:victimes: 0 / à bord: 119
Total:victimes: 0 / à bord: 128
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:New York-John F. Kennedy International Airport, NY (JFK) (   Etats-Unis d'Amérique)
Phase de vol: A l'atterrissage (LDG)
Nature:Transport de Passagers Intern.
Aéroport de départ:Keflavík International Airport (KEF/BIKF), Islande
Aéroport de destination:New York-John F. Kennedy International Airport, NY (JFK/KJFK), Etats-Unis d'Amérique
Détails:
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:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 165 days (6 months)
Accident number: NTSB-AAR-73-20
Download report: Final report

Sources:
» NTSB-AAR-73-20


Opérations de secours
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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Plan
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Keflavík International Airport et New York-John F. Kennedy International Airport, NY est de 4131 km (2582 miles).

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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