What was found
THE AIRCRAFT DEVELOPED VIBRATION SHORTLY AFTER TAKEOFF AND THE NR 2 ENGINE OIL QUANTITY BEGAN TO DROP RAPIDLY. THE NR 2 ENGINE WAS SHUT DOWN AND THE AIRCRAFT WAS RETURNED TO DCA WHERE IT LANDED WITHOUT INCIDENT. THE NR 2 ENGINE WAS REMOVED AND REPLACED. *S/D* DISASSEMBLY REVEALED LPT IMPACT DAMAGE RESULTING FROM FAILED HARDWARE FROM THE NR 6 BEARING HOUSING AREA. FURTHER DISASSEMBLY FOUND THE NR 6 PUMP SEIZED. THE FAILURE OF THE NR 6 PUMP IS BELIEVED TO BE CAUSED BY LOOSE HARDWARE IN THE NR 6 HOUSING THAT LIBERATED AND EVENTUALLY BECAME LODGED IN THE PUMP'S GEARS THEREBY SEIZING THE PUMP.