hinge 20 it is to be appreciated however that the system may utilize other types of actuators for example electric actuators to control the blade 12 fold and may require additional positioning actuators which move the blades 12 in other planes of motion about or around the hub 14 referring again to fig2 the pitch lock actuators 18 hinge lock actuators 26 and fold actuators 24 are connected to a fold control system 28 which controls the sequencing on the actuators 18 26 and the fold actuator 24 during a blade fold and blade spread operation sensors 30 are located at each of the actuators 18 26 and the fold actuators 24 to monitor the blade fold operation and are in operable communication with the fold control system 28 if during operation of the blade fold system a sensor 30 indicates an actuator 18 26 and or 24 is operating outside of a predetermined limit the fold control system 28 takes appropriate action which may include holding or aborting the blade fold operation or reversing the sequence to return to the starting configuration fig4 illustrates an example of a blade fold process including a method of fault detection in and control.