The only hydraulic actuation of the No. 1 blade is damper positioning. The hydraulic portion of the system positions the blades and folds the No. 2 blade. The electrical portion of the system provides the sequencing of operation of the various hydraulic components. It acts to prevent accidental operation of the system. Warning and indicating lights show the status of the system at all times.
Safe operation is maintained by a series of electrical interlocks.
You should perform blade folding operations with the pylon locked in the flight position and the engine operating at 104 percent. The rotary-wing head must not be operating. The blade switch is placed in the FOLD position. Hydraulic pressure from the utility hydraulic system is 3,000 psi. The pressure flows through the motor-operated safety valve.