What was found
(CAN) A POPPING SOUND WAS HEARD IMMEDIATELY AFTER TAKEOFF ACCOMPANIED BY DECAYING PARAMETERS AND AN "ENGINE OUT" WARNING LIGHT ON NR1 ENGINE. THE ENGINE WAS SHUTDOWN AND THE AIRCRAFT RETURNED TO ITS POINT OF DEPARTURE. POST FLIGHT INSPECTION FOUND THE HP FUEL PUMP TO BE FAULTY. THE FUEL PUMP WAS REPLACED AND THE AIRCRAFT RETURNED TO SERVICE.