What was found
AIRCRAFT WAS GROUNDED: PILOT DECLARED EMERGENCY ON ACCOUNT OF NO ENGINE OIL PRESSURE FOR THE NR 1 ENGINE. CREW SHUTDOWN THE ENGINE. RETURNED TO PHL AND LANDED OVERWEIGHT WITHOUT INCIDENT. SINGLE ENGINE TIME WAS 27 MINUTES. ***SUPPLEMENTAL INFORMANTION: ENGINE WAS REMOVED DUE TO LOSS OF OIL PRESSURE DURING TAKEOFF. THE LOSS OF OIL WAS DUE TO DAMAGED OIL FILTER COVER BOLTS AND PULLED INSERTS. THE LUBE UNIT WAS REPLACED. THE FDR WAS REVIEWED, AFTER THE ENGINE WAS REMOVED, IT WAS DETERMINDED THAT THE ENGINE LO OIL PRESSURE WARNING ILLUMINATED AND THAT IT WAS 26 SECONDS BEFORE THE ENGINE FUEL FLOW WAS CUT-OFF, THE N1 AND N2 ARE CONSIDERED TO BE IN AN IDLE AREA, THEREFORE THIS ENGINE IS CONSIDERED SERVICEABLE AND DOES NOT REQUIRE A SHOP VISIT. EA 293976 AUTHORIZES CONTINUANCE IN SERVICE. *** (CLOSED)