What was found
(CAN) ON APPROACH AND FLAPS SELECTED TO 10 DEGREES. CREW SELECTED GEAR DOWN, BUT THERE WAS NO RESPONSE, AND NO HYD PRESSURE. EMERGENGY LANDING CARRIED OUT AFTER GEAR PUMPED DOWN. AIRCRAFT LANDED OK. HYDRAULIC FLUID NOTED COMING FROM BELLY OF AIRCRAFT. FURTHER INVESTIGATION FOUND A CRACKED NON-RETURN CHECK VALVE IN THE LEFT HAND HYDRAULIC PUMP DELIVERY LINE. THE THREADED AREA RADIUS WAS FOUND CRACKED ON THE CHECK VALVE. PART TC: 15,045.