What was found
PILOT REPORTED LOW HYDRAULIC PRESSURE WITH ONE ENGINE RUNNING AND AT IDLE. DISCOVERED THE HYDRAULIC FLUID FLOW RATE THROUGH THE RAM AIR HYDRAULIC FAN TO BE EXCESSIVE. REPLACED ASSEMBLY WITH REPAIRED UNIT AND RETESTED FLOW RATE AND FOUND TO BE WITHIN TOLERANCE LEVELS. DUE TO THE NORMALLY HIGH FLOW RATE OF THE FAN MOTOR AND THE SUBSEQUENT LOSS OF PRESSURE WHEN THIS UNIT BEGINS TO FAIL, IT IS SUGGESTED THAT AN ELECTRIC MOTOR/FAN ASSEMBLY BE DESIGNED AS A REPLACEMENT TO THIS EXISTING ASSEMBLY.