What was found
EWR - FLT 0744 - THE LANDING GEAR WOULD NOT EXTEND INITIALLY ON APPROACH TO EWR. THE GEAR DID NOT MOVE AND THERE WERE NO WARNING LIGHTS. THE GEAR HANDLE WAS CYCLED, AND THE GEAR EXTENDED WITH A LOUD BANG AFTER FIVE SECONDS. MAINTENANCE FOUND THE NLG RETRACT ACTUATOR AT FAULT. THE NLG RETRACT ACTUATOR WAS REMOVED AND REPLACED. THE NOSE GEAR HYDRAULIC MODULE, NLG HYDRAULIC TRANSFER CYLINDER, AND NLG LOCK ACTUATOR WERE REMOVED AND REPLACED AS A PRECAUTIONARY MEASURE. LEAK AND OPERATIONAL CHECKS WERE GOOD. (X)