Nose gear up cycle schematic.

Figure 12-2.–Nose gear up cycle schematic. When the landing gear handle is in the UP position, a circuit is completed from the landing gear handle circuit breaker, through the landing gear up switch, to the selector valve. The selector valve is electrically positioned to direct pressure into the landing gear up lines and to vent the down lines to return. Fluid flows from the selector valve, through a flow reguIator to the up side of the nose gear cylinder. Fluid also flows through another flow regulator to the down lock cylinder. The down lock cylinder disengages the down lock, and the nose gear cylinder starts to raise the nose gear. As the gear is raised, the nose gear doors are closed by mechanical linkage. When the gear is fully retracted, the up lock mechanism engages the nose gear to lock it in the up position. The up lock mechanism is mechanically actuated through linkage connected to the nose gear. As soon as the down lock mechanism is disengaged and the gear starts to retract, the pilot’s position indicator displays change from a wheel to a barber pole, and the transition light on the landing gear control panel comes on. As soon as the gear is up and locked, the transition 12-3