Fluid from the pump is delivered to port 1 and then passes through check valve 2, a groove of spool 3 and port 4 to the power cylinder which retracts the landing gear. Fluid from the exhaust end of the cylinder passes from port 5 to port 6, connected by grooves and passages d to the middle and extreme left ends of the valve and to the tank. When lever 7 is turned counterclockwise about fixed axis A, spool 3 is shifted to the l eft. At this, fluid under pressure is delivered through port 5 to the other end of the power cylinder, lowering the landing gear. Fluid from the exhaust end of the cylinder drains to the tank through port 6. Port 8 serves to connect the exhaust ends of the power cylinders to the emergency tank used in emergency lowering of the landing gear by means of the manual emergency pump. In this case, lever 7 is shifted to the extreme right-hand position in which port 4 is connected through passages d to port 8 which leads to the emergency tank.
$3916$LHP,FC$