What was found
APPROXIMATELY 4 MINUTES AFTER TAKEOFF, THE NR 1 ENGINE LOW OIL PRESSURE LIGHT ILLUMINATED. PRESSURE DROPPED TO APPROXIMATELY 20 PSI, QUANTITY WENT TO ZERO. ACCOMPLISHED ENGINE SHUTDOWN, EMERGENCY LANDING DECLARED. INTERIM REPAIR OF NR 1 ENGINE OIL FILTER COVER. INSPECTED FILTER AND REMAINING 3 STUDS. RAN ENGINE AT HIGH POWER, NO LEAKS NOTED. SAFE FOR FERRY FLIGHT. DURING FERRY FLIGHT, NR 1 ENGINE OIL QUANTITY DROPPED. DIVERTED TO ICT. INSTALLED HELICOIL INSERT PER PRATT AND WHITNEY MM CHAPTER 72, NR 1 ENGINE OIL FILTER COVER FWD LOWER STUD. RAN ENGINE AT 85 PERCENT POWER, NO LEAKS NOTED.