AIRCRAFT LANDING GEAR AND SKID MECHANISM WITH AN EMERGENCY LOWERING FEATURE

Pump 1 delivers hydraulic fluid, at a pressure controlled by relief valve 2, through check valve 3 into a directional valve with spool 4 which directs the fluid to ends A of power cylinders 5. This moves pistons 6 which retract the landing ghear and skid. From ends D of the cylinders, fluid is discharged through valves 7 and the directional valve to the tank. When the landing gear is in the retrac…