What was found
DURING CLIMB OUT FROM WIKB, ''HYDRAULIC 3 ELEVATOR OFF'' LEVEL 1 ALERT ILLUMINATED. HYDRAULIC QTY STABILIZED AT 4.8 GALLONS. THIRTY MINUTES LATER ''HYDRAULIC QTY 3 LOW'' ALERT LEVEL 2 ILLUMINATED FOLLOWED BY ''HYDRAULIC FAIL'' LEVEL 3 ALERT. EMERGENCY PROCEDURES WERE COMPLIED WITH AND AIRCRAFT RETURNED TO DEPARTURE AIRPORT WITHOUT FURTHER INCIDENT. MAINTENANCE PERSONEEL INSPECTED AIRCRAFT AND FOUND THE NON-REVERSIBLE, MOTOR-PUMP SHUTOFF VALVE FAILED. THE VALVE WAS REPLACED THE SYSTEM TESTED SATISFACTORY AND THE AIRCRAFT RETURNED TO SERVICE. REPLACED THE NON-REVERSIBLE MOTOR-PUMP SHUTOFF VALVE. TESTED SYSTEM AND FOUND SATISFACTORY. (M)