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Last updated: 5 December 2021
Statuts:
Date:mercredi 15 octobre 1975
Type/Sous-type:Silhouette image of generic G159 model; specific model in this crash may look slightly different
Grumman TC-4C (G-159 Gulfstream I)
Compagnie:United States Marine Corps
Immatriculation: 155723
Numéro de série: 178
Année de Fabrication: 1967
Equipage:victimes: 9 / à bord: 9
Passagers:victimes: 0 / à bord: 0
Total:victimes: 9 / à bord: 9
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Cherry Point MCAS, NC (NKT) (   Etats-Unis d'Amérique)
Phase de vol: En montée initiale (ICL)
Nature:Militaire
Aéroport de départ:Cherry Point MCAS, NC (KNKT), Etats-Unis d'Amérique
Aéroport de destination:Cherry Point MCAS, NC (KNKT), Etats-Unis d'Amérique
Détails:
Shortly after lift off, a low torque sensing switch failed precipitating an auto feather of an engine. The crew mis-handled the required feathering procedure, allowing the propeller to unfeather and windmill. Subsequently, the crew retracted the flaps. This disabled a spring tab on the rudder which was designed to give additional rudder authority for high power/low airspeed situations. The result of the windmilling propeller and the loss in rudder authority was that V(mca) increased from 101 kts to 138 kts. The airplane rolled inverted and crashed. Witness marks on the operating engine's propeller reportedly indicated that the airplane's speed when it crashed was less than 90 kts.
All on board, four crew men, four students and one instructor, were killed.

Sources:
» The Times-News - Oct 16, 1975
» William L. Hall


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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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