Narrative:

During descent; about 45 mins from landing; I had just arrived into the cockpit from my rest period. When I sat down in the first officer's seat; the captain immediately advised me of the N2 vibration in the left engine. The N2 indication varied from 5.0 to 2.3 approximately at various throttle position during the approach. During the vector to final for the ILS runway 27R; I noticed and relayed to the rest of the crew that were rapidly losing oil in the left engine. The captain told the relief pilot to get out the flight manual and review single engine operations. During the time the captain talked to the relief pilot we had joined the localizer; the left engine oil quantity went to zero; the N2 vibration remained at 5.0; the engine oil pressure dropped to 90 degrees and shortly thereafter; went to red and the warning for left engine low oil pressure checklist illuminated. I accomplished the checklist; shut down the left engine; declared an emergency to approach control; accomplished the landing checklist; and asked the relief pilot if everything looked correct. During this same time the relief pilot talked to the purser and told her to accomplish a 'cabin advisory;' and he made an announcement to the passenger. The landing was uneventful. The aircraft was stopped on the taxiway while the crash fire rescue equipment crews looked at the left engine. No damage or fire indications were found and the taxi to the gate was uneventful.

Related reports:

Google
 

Original NASA ASRS Text

Title: FLT CREW OF B777-200 EXPERIENCE LOSS OF OIL QUANTITY AND PRESSURE DURING DSCNT. SHUT DOWN L ENG; DECLARE EMER AND LAND AT DEST.

Narrative: DURING DSCNT; ABOUT 45 MINS FROM LNDG; I HAD JUST ARRIVED INTO THE COCKPIT FROM MY REST PERIOD. WHEN I SAT DOWN IN THE FO'S SEAT; THE CAPT IMMEDIATELY ADVISED ME OF THE N2 VIBRATION IN THE L ENG. THE N2 INDICATION VARIED FROM 5.0 TO 2.3 APPROX AT VARIOUS THROTTLE POS DURING THE APCH. DURING THE VECTOR TO FINAL FOR THE ILS RWY 27R; I NOTICED AND RELAYED TO THE REST OF THE CREW THAT WERE RAPIDLY LOSING OIL IN THE L ENG. THE CAPT TOLD THE RELIEF PLT TO GET OUT THE FLT MANUAL AND REVIEW SINGLE ENG OPS. DURING THE TIME THE CAPT TALKED TO THE RELIEF PLT WE HAD JOINED THE LOC; THE L ENG OIL QUANTITY WENT TO ZERO; THE N2 VIBRATION REMAINED AT 5.0; THE ENG OIL PRESSURE DROPPED TO 90 DEGS AND SHORTLY THEREAFTER; WENT TO RED AND THE WARNING FOR L ENG LOW OIL PRESSURE CHKLIST ILLUMINATED. I ACCOMPLISHED THE CHKLIST; SHUT DOWN THE L ENG; DECLARED AN EMER TO APCH CTL; ACCOMPLISHED THE LNDG CHKLIST; AND ASKED THE RELIEF PLT IF EVERYTHING LOOKED CORRECT. DURING THIS SAME TIME THE RELIEF PLT TALKED TO THE PURSER AND TOLD HER TO ACCOMPLISH A 'CABIN ADVISORY;' AND HE MADE AN ANNOUNCEMENT TO THE PAX. THE LNDG WAS UNEVENTFUL. THE ACFT WAS STOPPED ON THE TXWY WHILE THE CFR CREWS LOOKED AT THE L ENG. NO DAMAGE OR FIRE INDICATIONS WERE FOUND AND THE TAXI TO THE GATE WAS UNEVENTFUL.

Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.