Unfallbericht:Shortly after lift off, a low torque sensing switch failed precipatating 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.
|Datum:||Donnerstag 16 Oktober 1975|
|Flugzeugtyp:||Grumman TC-4C (G-159 Gulfstream I)|
|Fluggesellschaft:||United States Marine Corps|
|Besatzung:||Todesopfer: / Insassen: |
|Fluggäste:||Todesopfer: / Insassen: |
|Gesamt:||Todesopfer: 9 / Insassen: 9 |
|Konsequenzen:|| Written off (damaged beyond repair)|
|Unfallort:||Cherry Point MCAS, NC (NKT) (USA)
|Flugphase:|| Anfangssteigflug (ICL)|
|Flug von:||Cherry Point MCAS, NC (NKT), USA|
» William L. Hall
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.