What was found
ORF - FLT 1721 - DURING CLIMB-OUT FL230 TO FL350 THE CREW NOTICED THE OIL PRESSURE LIGHT ON AND THE OIL QUANTITY RAPIDLY DECREASING ON THE LEFT ENGINE. THE LEFT ENGINE WAS SHUT DOWN AS A PRECAUTIONARY WHEN THE OIL PRESSURE REACHED 20 PSI. AN EMERGENCY WAS DECLARED AND THE FLIGHT DIVERTED TO ORF. THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND THE NR 1 ENGINE MAIN OIL FILTER COVER STUDS STRIPPED FROM HOUSING. INSTALLED HELI-COILS AND STUDS IN OIL FILTER HOUSING. ALSO, INSTALLED NEW FILTER. LEAK AND OPS CHECK OF SYSTEM OK. (M)