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Hello, if I remember right from my time on Chinooks there was a hardware issue on the hydraulic actuator pilot valve, a grub screw or bolt came out causing a jam or disconnection of the control rod to the actuator. Can’t remember if it was pivoting or swiveling actuator(Chinook has two hydraulic primary flight control actuators on each Forward and aft rotor).
Again, if memory serves we had to inspect behind a small access plate on the actuator that this hardware was installed/safeties installed before using the part because of this accident.
dan