PRESSURIZATION OPERATIONTo pressurize the reservoir, make sure that the depressurization valve isclosed.NOTE: Note that the three hydraulic reservoirs are pressurized throughthe air pressure manifold, thus they are pressurized at the sametime.Open the blue hydraulic compartment door to gain access to the airpressure manifold. Install the Ram Air Turbine safety device to preventaccidental deployment. Remove the cap from the ground connector.Connect the pressurizing tool to the ground connector. Turn the nut toopen the ground connector valve. Fill the reservoir with air until 50 psiis shown on the reservoir pressure gauge. Turn the nut to close the groundconnector valve. Remove the pressurizing tool. Install the cap on theground connector. Remove the Ram Air Turbine safety device when themaintenance operation is completed. Close the C/Bs. Make sure that thework area is clean and clear of tools and other items and all access panelsare closed.