What was found
(CAN) DURING CLIMB THROUGH 18000 FT ENGINE NR 1 LOW OIL PRESSURE LIGHT ILLUMINATED ACCOMPANIED BY RAPIDLY DECREASING OIL QUANTITY AND PRESSURE INDICATIONS. CREW CARRIED OUT ENGINE SHUTDOWN CHECKLIST DECLARED AN EMERGENCY, DUMPED FUEL AND RETURNED TO DEPARTURE WITHOUT FURTHER INCIDENT. DURING INVESTIGATION BY MAINTENANCE, IT WAS FOUND THAT THE GEARBOX TO OIL COOLER LINE HAD PULLED DIRECTLY OUT OF THE ENGINE GEARBOX HOUSING. THIS IS NOT REPAIRABLE ON-WING AND DUE TO THE LENGTH OF TIME ENGINE WINDMILLED WITHOUT OIL, RESULTS IN AN ENGINE CHANGE. AS A PRECAUTION WE ARE CARRYING OUT A FLEETWIDE INSPECTION FOR ANY SEPARATION BETWEEN THIS LINE AND THE GEARBOX ON ALL ENGINES.